689 lines
23 KiB
Plaintext
689 lines
23 KiB
Plaintext
#
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# IP configuration
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#
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config IP_MULTICAST
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bool "IP: multicasting"
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help
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This is code for addressing several networked computers at once,
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enlarging your kernel by about 2 KB. You need multicasting if you
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intend to participate in the MBONE, a high bandwidth network on top
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of the Internet which carries audio and video broadcasts. More
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information about the MBONE is on the WWW at
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<http://www.savetz.com/mbone/>. For most people, it's safe to say N.
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config IP_ADVANCED_ROUTER
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bool "IP: advanced router"
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---help---
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If you intend to run your Linux box mostly as a router, i.e. as a
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computer that forwards and redistributes network packets, say Y; you
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will then be presented with several options that allow more precise
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control about the routing process.
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The answer to this question won't directly affect the kernel:
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answering N will just cause the configurator to skip all the
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questions about advanced routing.
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Note that your box can only act as a router if you enable IP
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forwarding in your kernel; you can do that by saying Y to "/proc
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file system support" and "Sysctl support" below and executing the
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line
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echo "1" > /proc/sys/net/ipv4/ip_forward
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at boot time after the /proc file system has been mounted.
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If you turn on IP forwarding, you should consider the rp_filter, which
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automatically rejects incoming packets if the routing table entry
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for their source address doesn't match the network interface they're
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arriving on. This has security advantages because it prevents the
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so-called IP spoofing, however it can pose problems if you use
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asymmetric routing (packets from you to a host take a different path
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than packets from that host to you) or if you operate a non-routing
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host which has several IP addresses on different interfaces. To turn
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rp_filter on use:
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echo 1 > /proc/sys/net/ipv4/conf/<device>/rp_filter
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or
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echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter
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Note that some distributions enable it in startup scripts.
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For details about rp_filter strict and loose mode read
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<file:Documentation/networking/ip-sysctl.txt>.
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If unsure, say N here.
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config IP_FIB_TRIE_STATS
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bool "FIB TRIE statistics"
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depends on IP_ADVANCED_ROUTER
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---help---
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Keep track of statistics on structure of FIB TRIE table.
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Useful for testing and measuring TRIE performance.
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config IP_MULTIPLE_TABLES
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bool "IP: policy routing"
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depends on IP_ADVANCED_ROUTER
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select FIB_RULES
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---help---
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Normally, a router decides what to do with a received packet based
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solely on the packet's final destination address. If you say Y here,
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the Linux router will also be able to take the packet's source
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address into account. Furthermore, the TOS (Type-Of-Service) field
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of the packet can be used for routing decisions as well.
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If you are interested in this, please see the preliminary
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documentation at <http://www.compendium.com.ar/policy-routing.txt>
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and <ftp://post.tepkom.ru/pub/vol2/Linux/docs/advanced-routing.tex>.
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You will need supporting software from
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<ftp://ftp.tux.org/pub/net/ip-routing/>.
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If unsure, say N.
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config IP_ROUTE_MULTIPATH
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bool "IP: equal cost multipath"
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depends on IP_ADVANCED_ROUTER
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help
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Normally, the routing tables specify a single action to be taken in
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a deterministic manner for a given packet. If you say Y here
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however, it becomes possible to attach several actions to a packet
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pattern, in effect specifying several alternative paths to travel
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for those packets. The router considers all these paths to be of
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equal "cost" and chooses one of them in a non-deterministic fashion
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if a matching packet arrives.
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config IP_ROUTE_VERBOSE
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bool "IP: verbose route monitoring"
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depends on IP_ADVANCED_ROUTER
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help
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If you say Y here, which is recommended, then the kernel will print
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verbose messages regarding the routing, for example warnings about
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received packets which look strange and could be evidence of an
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attack or a misconfigured system somewhere. The information is
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handled by the klogd daemon which is responsible for kernel messages
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("man klogd").
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config IP_ROUTE_CLASSID
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bool
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config IP_PNP
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bool "IP: kernel level autoconfiguration"
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help
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This enables automatic configuration of IP addresses of devices and
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of the routing table during kernel boot, based on either information
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supplied on the kernel command line or by BOOTP or RARP protocols.
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You need to say Y only for diskless machines requiring network
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access to boot (in which case you want to say Y to "Root file system
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on NFS" as well), because all other machines configure the network
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in their startup scripts.
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config IP_PNP_DHCP
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bool "IP: DHCP support"
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depends on IP_PNP
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---help---
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If you want your Linux box to mount its whole root file system (the
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one containing the directory /) from some other computer over the
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net via NFS and you want the IP address of your computer to be
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discovered automatically at boot time using the DHCP protocol (a
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special protocol designed for doing this job), say Y here. In case
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the boot ROM of your network card was designed for booting Linux and
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does DHCP itself, providing all necessary information on the kernel
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command line, you can say N here.
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If unsure, say Y. Note that if you want to use DHCP, a DHCP server
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must be operating on your network. Read
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<file:Documentation/filesystems/nfs/nfsroot.txt> for details.
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config IP_PNP_BOOTP
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bool "IP: BOOTP support"
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depends on IP_PNP
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---help---
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If you want your Linux box to mount its whole root file system (the
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one containing the directory /) from some other computer over the
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net via NFS and you want the IP address of your computer to be
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discovered automatically at boot time using the BOOTP protocol (a
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special protocol designed for doing this job), say Y here. In case
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the boot ROM of your network card was designed for booting Linux and
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does BOOTP itself, providing all necessary information on the kernel
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command line, you can say N here. If unsure, say Y. Note that if you
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want to use BOOTP, a BOOTP server must be operating on your network.
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Read <file:Documentation/filesystems/nfs/nfsroot.txt> for details.
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config IP_PNP_RARP
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bool "IP: RARP support"
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depends on IP_PNP
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help
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If you want your Linux box to mount its whole root file system (the
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one containing the directory /) from some other computer over the
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net via NFS and you want the IP address of your computer to be
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discovered automatically at boot time using the RARP protocol (an
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older protocol which is being obsoleted by BOOTP and DHCP), say Y
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here. Note that if you want to use RARP, a RARP server must be
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operating on your network. Read
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<file:Documentation/filesystems/nfs/nfsroot.txt> for details.
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config NET_IPIP
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tristate "IP: tunneling"
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select INET_TUNNEL
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select NET_IP_TUNNEL
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---help---
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Tunneling means encapsulating data of one protocol type within
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another protocol and sending it over a channel that understands the
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encapsulating protocol. This particular tunneling driver implements
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encapsulation of IP within IP, which sounds kind of pointless, but
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can be useful if you want to make your (or some other) machine
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appear on a different network than it physically is, or to use
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mobile-IP facilities (allowing laptops to seamlessly move between
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networks without changing their IP addresses).
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Saying Y to this option will produce two modules ( = code which can
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be inserted in and removed from the running kernel whenever you
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want). Most people won't need this and can say N.
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config NET_IPGRE_DEMUX
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tristate "IP: GRE demultiplexer"
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help
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This is helper module to demultiplex GRE packets on GRE version field criteria.
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Required by ip_gre and pptp modules.
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config NET_IP_TUNNEL
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tristate
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default n
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config NET_IPGRE
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tristate "IP: GRE tunnels over IP"
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depends on (IPV6 || IPV6=n) && NET_IPGRE_DEMUX
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select NET_IP_TUNNEL
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help
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Tunneling means encapsulating data of one protocol type within
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another protocol and sending it over a channel that understands the
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encapsulating protocol. This particular tunneling driver implements
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GRE (Generic Routing Encapsulation) and at this time allows
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encapsulating of IPv4 or IPv6 over existing IPv4 infrastructure.
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This driver is useful if the other endpoint is a Cisco router: Cisco
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likes GRE much better than the other Linux tunneling driver ("IP
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tunneling" above). In addition, GRE allows multicast redistribution
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through the tunnel.
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config NET_IPGRE_BROADCAST
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bool "IP: broadcast GRE over IP"
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depends on IP_MULTICAST && NET_IPGRE
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help
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One application of GRE/IP is to construct a broadcast WAN (Wide Area
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Network), which looks like a normal Ethernet LAN (Local Area
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Network), but can be distributed all over the Internet. If you want
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to do that, say Y here and to "IP multicast routing" below.
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config IP_MROUTE
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bool "IP: multicast routing"
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depends on IP_MULTICAST
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help
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This is used if you want your machine to act as a router for IP
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packets that have several destination addresses. It is needed on the
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MBONE, a high bandwidth network on top of the Internet which carries
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audio and video broadcasts. In order to do that, you would most
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likely run the program mrouted. If you haven't heard about it, you
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don't need it.
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config IP_MROUTE_MULTIPLE_TABLES
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bool "IP: multicast policy routing"
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depends on IP_MROUTE && IP_ADVANCED_ROUTER
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select FIB_RULES
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help
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Normally, a multicast router runs a userspace daemon and decides
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what to do with a multicast packet based on the source and
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destination addresses. If you say Y here, the multicast router
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will also be able to take interfaces and packet marks into
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account and run multiple instances of userspace daemons
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simultaneously, each one handling a single table.
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If unsure, say N.
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config IP_PIMSM_V1
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bool "IP: PIM-SM version 1 support"
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depends on IP_MROUTE
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help
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Kernel side support for Sparse Mode PIM (Protocol Independent
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Multicast) version 1. This multicast routing protocol is used widely
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because Cisco supports it. You need special software to use it
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(pimd-v1). Please see <http://netweb.usc.edu/pim/> for more
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information about PIM.
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Say Y if you want to use PIM-SM v1. Note that you can say N here if
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you just want to use Dense Mode PIM.
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config IP_PIMSM_V2
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bool "IP: PIM-SM version 2 support"
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depends on IP_MROUTE
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help
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Kernel side support for Sparse Mode PIM version 2. In order to use
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this, you need an experimental routing daemon supporting it (pimd or
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gated-5). This routing protocol is not used widely, so say N unless
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you want to play with it.
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config SYN_COOKIES
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bool "IP: TCP syncookie support"
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---help---
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Normal TCP/IP networking is open to an attack known as "SYN
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flooding". This denial-of-service attack prevents legitimate remote
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users from being able to connect to your computer during an ongoing
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attack and requires very little work from the attacker, who can
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operate from anywhere on the Internet.
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SYN cookies provide protection against this type of attack. If you
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say Y here, the TCP/IP stack will use a cryptographic challenge
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protocol known as "SYN cookies" to enable legitimate users to
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continue to connect, even when your machine is under attack. There
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is no need for the legitimate users to change their TCP/IP software;
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SYN cookies work transparently to them. For technical information
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about SYN cookies, check out <http://cr.yp.to/syncookies.html>.
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If you are SYN flooded, the source address reported by the kernel is
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likely to have been forged by the attacker; it is only reported as
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an aid in tracing the packets to their actual source and should not
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be taken as absolute truth.
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SYN cookies may prevent correct error reporting on clients when the
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server is really overloaded. If this happens frequently better turn
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them off.
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If you say Y here, you can disable SYN cookies at run time by
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saying Y to "/proc file system support" and
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"Sysctl support" below and executing the command
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echo 0 > /proc/sys/net/ipv4/tcp_syncookies
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after the /proc file system has been mounted.
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If unsure, say N.
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config NET_IPVTI
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tristate "Virtual (secure) IP: tunneling"
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select INET_TUNNEL
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select NET_IP_TUNNEL
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depends on INET_XFRM_MODE_TUNNEL
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---help---
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Tunneling means encapsulating data of one protocol type within
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another protocol and sending it over a channel that understands the
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encapsulating protocol. This can be used with xfrm mode tunnel to give
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the notion of a secure tunnel for IPSEC and then use routing protocol
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on top.
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config NET_UDP_TUNNEL
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tristate
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select NET_IP_TUNNEL
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default n
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config NET_FOU
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tristate "IP: Foo (IP protocols) over UDP"
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select XFRM
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select NET_UDP_TUNNEL
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---help---
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Foo over UDP allows any IP protocol to be directly encapsulated
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over UDP include tunnels (IPIP, GRE, SIT). By encapsulating in UDP
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network mechanisms and optimizations for UDP (such as ECMP
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and RSS) can be leveraged to provide better service.
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config NET_FOU_IP_TUNNELS
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bool "IP: FOU encapsulation of IP tunnels"
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depends on NET_IPIP || NET_IPGRE || IPV6_SIT
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select NET_FOU
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---help---
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Allow configuration of FOU or GUE encapsulation for IP tunnels.
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When this option is enabled IP tunnels can be configured to use
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FOU or GUE encapsulation.
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config INET_AH
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tristate "IP: AH transformation"
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select XFRM_ALGO
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select CRYPTO
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select CRYPTO_HMAC
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select CRYPTO_MD5
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select CRYPTO_SHA1
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---help---
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Support for IPsec AH.
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If unsure, say Y.
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config INET_ESP
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tristate "IP: ESP transformation"
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select XFRM_ALGO
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select CRYPTO
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select CRYPTO_AUTHENC
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select CRYPTO_HMAC
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select CRYPTO_MD5
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select CRYPTO_CBC
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select CRYPTO_SHA1
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select CRYPTO_DES
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---help---
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Support for IPsec ESP.
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If unsure, say Y.
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config INET_IPCOMP
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tristate "IP: IPComp transformation"
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select INET_XFRM_TUNNEL
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select XFRM_IPCOMP
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---help---
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Support for IP Payload Compression Protocol (IPComp) (RFC3173),
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typically needed for IPsec.
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If unsure, say Y.
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config INET_XFRM_TUNNEL
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tristate
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select INET_TUNNEL
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default n
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config INET_TUNNEL
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tristate
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default n
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config INET_XFRM_MODE_TRANSPORT
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tristate "IP: IPsec transport mode"
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default y
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select XFRM
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---help---
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Support for IPsec transport mode.
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If unsure, say Y.
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config INET_XFRM_MODE_TUNNEL
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tristate "IP: IPsec tunnel mode"
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default y
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select XFRM
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---help---
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Support for IPsec tunnel mode.
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If unsure, say Y.
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config INET_XFRM_MODE_BEET
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tristate "IP: IPsec BEET mode"
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default y
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select XFRM
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---help---
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Support for IPsec BEET mode.
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If unsure, say Y.
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config INET_LRO
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tristate "Large Receive Offload (ipv4/tcp)"
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default y
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---help---
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Support for Large Receive Offload (ipv4/tcp).
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If unsure, say Y.
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config INET_DIAG
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tristate "INET: socket monitoring interface"
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default y
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---help---
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Support for INET (TCP, DCCP, etc) socket monitoring interface used by
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native Linux tools such as ss. ss is included in iproute2, currently
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downloadable at:
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http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2
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If unsure, say Y.
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config INET_TCP_DIAG
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depends on INET_DIAG
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def_tristate INET_DIAG
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config INET_UDP_DIAG
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tristate "UDP: socket monitoring interface"
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depends on INET_DIAG && (IPV6 || IPV6=n)
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default n
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---help---
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Support for UDP socket monitoring interface used by the ss tool.
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If unsure, say Y.
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menuconfig TCP_CONG_ADVANCED
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bool "TCP: advanced congestion control"
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---help---
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Support for selection of various TCP congestion control
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modules.
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Nearly all users can safely say no here, and a safe default
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selection will be made (CUBIC with new Reno as a fallback).
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If unsure, say N.
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if TCP_CONG_ADVANCED
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config TCP_CONG_BIC
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tristate "Binary Increase Congestion (BIC) control"
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default m
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---help---
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BIC-TCP is a sender-side only change that ensures a linear RTT
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fairness under large windows while offering both scalability and
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bounded TCP-friendliness. The protocol combines two schemes
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called additive increase and binary search increase. When the
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congestion window is large, additive increase with a large
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increment ensures linear RTT fairness as well as good
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scalability. Under small congestion windows, binary search
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increase provides TCP friendliness.
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See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/
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config TCP_CONG_CUBIC
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tristate "CUBIC TCP"
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default y
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---help---
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This is version 2.0 of BIC-TCP which uses a cubic growth function
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among other techniques.
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See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/cubic-paper.pdf
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config TCP_CONG_WESTWOOD
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tristate "TCP Westwood+"
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default m
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---help---
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TCP Westwood+ is a sender-side only modification of the TCP Reno
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protocol stack that optimizes the performance of TCP congestion
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control. It is based on end-to-end bandwidth estimation to set
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congestion window and slow start threshold after a congestion
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episode. Using this estimation, TCP Westwood+ adaptively sets a
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slow start threshold and a congestion window which takes into
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account the bandwidth used at the time congestion is experienced.
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TCP Westwood+ significantly increases fairness wrt TCP Reno in
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wired networks and throughput over wireless links.
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config TCP_CONG_HTCP
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tristate "H-TCP"
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default m
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---help---
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H-TCP is a send-side only modifications of the TCP Reno
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protocol stack that optimizes the performance of TCP
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congestion control for high speed network links. It uses a
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modeswitch to change the alpha and beta parameters of TCP Reno
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based on network conditions and in a way so as to be fair with
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other Reno and H-TCP flows.
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config TCP_CONG_HSTCP
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tristate "High Speed TCP"
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default n
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---help---
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Sally Floyd's High Speed TCP (RFC 3649) congestion control.
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A modification to TCP's congestion control mechanism for use
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with large congestion windows. A table indicates how much to
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increase the congestion window by when an ACK is received.
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For more detail see http://www.icir.org/floyd/hstcp.html
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config TCP_CONG_HYBLA
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tristate "TCP-Hybla congestion control algorithm"
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default n
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---help---
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TCP-Hybla is a sender-side only change that eliminates penalization of
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long-RTT, large-bandwidth connections, like when satellite legs are
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involved, especially when sharing a common bottleneck with normal
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terrestrial connections.
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config TCP_CONG_VEGAS
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tristate "TCP Vegas"
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default n
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---help---
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TCP Vegas is a sender-side only change to TCP that anticipates
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the onset of congestion by estimating the bandwidth. TCP Vegas
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adjusts the sending rate by modifying the congestion
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window. TCP Vegas should provide less packet loss, but it is
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not as aggressive as TCP Reno.
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config TCP_CONG_SCALABLE
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tristate "Scalable TCP"
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default n
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---help---
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Scalable TCP is a sender-side only change to TCP which uses a
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MIMD congestion control algorithm which has some nice scaling
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properties, though is known to have fairness issues.
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See http://www.deneholme.net/tom/scalable/
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config TCP_CONG_LP
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tristate "TCP Low Priority"
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default n
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---help---
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TCP Low Priority (TCP-LP), a distributed algorithm whose goal is
|
|
to utilize only the excess network bandwidth as compared to the
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|
``fair share`` of bandwidth as targeted by TCP.
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|
See http://www-ece.rice.edu/networks/TCP-LP/
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config TCP_CONG_VENO
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tristate "TCP Veno"
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default n
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---help---
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|
TCP Veno is a sender-side only enhancement of TCP to obtain better
|
|
throughput over wireless networks. TCP Veno makes use of state
|
|
distinguishing to circumvent the difficult judgment of the packet loss
|
|
type. TCP Veno cuts down less congestion window in response to random
|
|
loss packets.
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See <http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1177186>
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config TCP_CONG_YEAH
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tristate "YeAH TCP"
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select TCP_CONG_VEGAS
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default n
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---help---
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YeAH-TCP is a sender-side high-speed enabled TCP congestion control
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|
algorithm, which uses a mixed loss/delay approach to compute the
|
|
congestion window. It's design goals target high efficiency,
|
|
internal, RTT and Reno fairness, resilience to link loss while
|
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keeping network elements load as low as possible.
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|
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|
For further details look here:
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|
http://wil.cs.caltech.edu/pfldnet2007/paper/YeAH_TCP.pdf
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config TCP_CONG_ILLINOIS
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tristate "TCP Illinois"
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default n
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---help---
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|
TCP-Illinois is a sender-side modification of TCP Reno for
|
|
high speed long delay links. It uses round-trip-time to
|
|
adjust the alpha and beta parameters to achieve a higher average
|
|
throughput and maintain fairness.
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|
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|
For further details see:
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|
http://www.ews.uiuc.edu/~shaoliu/tcpillinois/index.html
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config TCP_CONG_DCTCP
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|
tristate "DataCenter TCP (DCTCP)"
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|
default n
|
|
---help---
|
|
DCTCP leverages Explicit Congestion Notification (ECN) in the network to
|
|
provide multi-bit feedback to the end hosts. It is designed to provide:
|
|
|
|
- High burst tolerance (incast due to partition/aggregate),
|
|
- Low latency (short flows, queries),
|
|
- High throughput (continuous data updates, large file transfers) with
|
|
commodity, shallow-buffered switches.
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|
|
|
All switches in the data center network running DCTCP must support
|
|
ECN marking and be configured for marking when reaching defined switch
|
|
buffer thresholds. The default ECN marking threshold heuristic for
|
|
DCTCP on switches is 20 packets (30KB) at 1Gbps, and 65 packets
|
|
(~100KB) at 10Gbps, but might need further careful tweaking.
|
|
|
|
For further details see:
|
|
http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp-final.pdf
|
|
|
|
config TCP_CONG_CDG
|
|
tristate "CAIA Delay-Gradient (CDG)"
|
|
default n
|
|
---help---
|
|
CAIA Delay-Gradient (CDG) is a TCP congestion control that modifies
|
|
the TCP sender in order to:
|
|
|
|
o Use the delay gradient as a congestion signal.
|
|
o Back off with an average probability that is independent of the RTT.
|
|
o Coexist with flows that use loss-based congestion control.
|
|
o Tolerate packet loss unrelated to congestion.
|
|
|
|
For further details see:
|
|
D.A. Hayes and G. Armitage. "Revisiting TCP congestion control using
|
|
delay gradients." In Networking 2011. Preprint: http://goo.gl/No3vdg
|
|
|
|
choice
|
|
prompt "Default TCP congestion control"
|
|
default DEFAULT_CUBIC
|
|
help
|
|
Select the TCP congestion control that will be used by default
|
|
for all connections.
|
|
|
|
config DEFAULT_BIC
|
|
bool "Bic" if TCP_CONG_BIC=y
|
|
|
|
config DEFAULT_CUBIC
|
|
bool "Cubic" if TCP_CONG_CUBIC=y
|
|
|
|
config DEFAULT_HTCP
|
|
bool "Htcp" if TCP_CONG_HTCP=y
|
|
|
|
config DEFAULT_HYBLA
|
|
bool "Hybla" if TCP_CONG_HYBLA=y
|
|
|
|
config DEFAULT_VEGAS
|
|
bool "Vegas" if TCP_CONG_VEGAS=y
|
|
|
|
config DEFAULT_VENO
|
|
bool "Veno" if TCP_CONG_VENO=y
|
|
|
|
config DEFAULT_WESTWOOD
|
|
bool "Westwood" if TCP_CONG_WESTWOOD=y
|
|
|
|
config DEFAULT_DCTCP
|
|
bool "DCTCP" if TCP_CONG_DCTCP=y
|
|
|
|
config DEFAULT_CDG
|
|
bool "CDG" if TCP_CONG_CDG=y
|
|
|
|
config DEFAULT_RENO
|
|
bool "Reno"
|
|
endchoice
|
|
|
|
endif
|
|
|
|
config TCP_CONG_CUBIC
|
|
tristate
|
|
depends on !TCP_CONG_ADVANCED
|
|
default y
|
|
|
|
config DEFAULT_TCP_CONG
|
|
string
|
|
default "bic" if DEFAULT_BIC
|
|
default "cubic" if DEFAULT_CUBIC
|
|
default "htcp" if DEFAULT_HTCP
|
|
default "hybla" if DEFAULT_HYBLA
|
|
default "vegas" if DEFAULT_VEGAS
|
|
default "westwood" if DEFAULT_WESTWOOD
|
|
default "veno" if DEFAULT_VENO
|
|
default "reno" if DEFAULT_RENO
|
|
default "dctcp" if DEFAULT_DCTCP
|
|
default "cdg" if DEFAULT_CDG
|
|
default "cubic"
|
|
|
|
config TCP_MD5SIG
|
|
bool "TCP: MD5 Signature Option support (RFC2385)"
|
|
select CRYPTO
|
|
select CRYPTO_MD5
|
|
---help---
|
|
RFC2385 specifies a method of giving MD5 protection to TCP sessions.
|
|
Its main (only?) use is to protect BGP sessions between core routers
|
|
on the Internet.
|
|
|
|
If unsure, say N.
|