621 lines
22 KiB
Plaintext
621 lines
22 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-itg.lbl.gov/mbone/>. Information about the multicast
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capabilities of the various network cards is contained in
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<file:Documentation/networking/multicast.txt>. For most people, it's
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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 will also get 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 off use:
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echo 0 > /proc/sys/net/ipv4/conf/<device>/rp_filter
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or
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echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter
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If unsure, say N here.
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choice
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prompt "Choose IP: FIB lookup algorithm (choose FIB_HASH if unsure)"
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depends on IP_ADVANCED_ROUTER
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default ASK_IP_FIB_HASH
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config ASK_IP_FIB_HASH
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bool "FIB_HASH"
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---help---
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Current FIB is very proven and good enough for most users.
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config IP_FIB_TRIE
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bool "FIB_TRIE"
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---help---
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Use new experimental LC-trie as FIB lookup algoritm.
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This improves lookup performance if you have a large
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number of routes.
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LC-trie is a longest matching prefix lookup algorithm which
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performs better than FIB_HASH for large routing tables.
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But, it consumes more memory and is more complex.
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LC-trie is described in:
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IP-address lookup using LC-tries. Stefan Nilsson and Gunnar Karlsson
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IEEE Journal on Selected Areas in Communications, 17(6):1083-1092, June 1999
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An experimental study of compression methods for dynamic tries
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Stefan Nilsson and Matti Tikkanen. Algorithmica, 33(1):19-33, 2002.
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http://www.nada.kth.se/~snilsson/public/papers/dyntrie2/
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endchoice
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config IP_FIB_HASH
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def_bool ASK_IP_FIB_HASH || !IP_ADVANCED_ROUTER
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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_FWMARK
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bool "IP: use netfilter MARK value as routing key"
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depends on IP_MULTIPLE_TABLES && NETFILTER
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help
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If you say Y here, you will be able to specify different routes for
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packets with different mark values (see iptables(8), MARK target).
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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_MULTIPATH_CACHED
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bool "IP: equal cost multipath with caching support (EXPERIMENTAL)"
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depends on IP_ROUTE_MULTIPATH
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help
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Normally, equal cost multipath routing is not supported by the
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routing cache. If you say Y here, alternative routes are cached
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and on cache lookup a route is chosen in a configurable fashion.
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If unsure, say N.
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config IP_ROUTE_MULTIPATH_RR
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tristate "MULTIPATH: round robin algorithm"
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depends on IP_ROUTE_MULTIPATH_CACHED
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help
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Mulitpath routes are chosen according to Round Robin
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config IP_ROUTE_MULTIPATH_RANDOM
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tristate "MULTIPATH: random algorithm"
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depends on IP_ROUTE_MULTIPATH_CACHED
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help
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Multipath routes are chosen in a random fashion. Actually,
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there is no weight for a route. The advantage of this policy
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is that it is implemented stateless and therefore introduces only
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a very small delay.
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config IP_ROUTE_MULTIPATH_WRANDOM
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tristate "MULTIPATH: weighted random algorithm"
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depends on IP_ROUTE_MULTIPATH_CACHED
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help
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Multipath routes are chosen in a weighted random fashion.
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The per route weights are the weights visible via ip route 2. As the
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corresponding state management introduces some overhead routing delay
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is increased.
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config IP_ROUTE_MULTIPATH_DRR
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tristate "MULTIPATH: interface round robin algorithm"
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depends on IP_ROUTE_MULTIPATH_CACHED
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help
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Connections are distributed in a round robin fashion over the
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available interfaces. This policy makes sense if the connections
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should be primarily distributed on interfaces and not on routes.
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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_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/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/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 <file:Documentation/nfsroot.txt> for
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details.
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# not yet ready..
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# bool ' IP: ARP support' CONFIG_IP_PNP_ARP
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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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---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
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tristate "IP: GRE tunnels over IP"
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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. Information about the multicast
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capabilities of the various network cards is contained in
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<file:Documentation/networking/multicast.txt>. If you haven't heard
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about it, you don't need it.
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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 ARPD
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bool "IP: ARP daemon support (EXPERIMENTAL)"
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depends on EXPERIMENTAL
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---help---
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Normally, the kernel maintains an internal cache which maps IP
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addresses to hardware addresses on the local network, so that
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Ethernet/Token Ring/ etc. frames are sent to the proper address on
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the physical networking layer. For small networks having a few
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hundred directly connected hosts or less, keeping this address
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resolution (ARP) cache inside the kernel works well. However,
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maintaining an internal ARP cache does not work well for very large
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switched networks, and will use a lot of kernel memory if TCP/IP
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connections are made to many machines on the network.
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If you say Y here, the kernel's internal ARP cache will never grow
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to more than 256 entries (the oldest entries are expired in a LIFO
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manner) and communication will be attempted with the user space ARP
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daemon arpd. Arpd then answers the address resolution request either
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from its own cache or by asking the net.
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This code is experimental and also obsolete. If you want to use it,
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you need to find a version of the daemon arpd on the net somewhere,
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and you should also say Y to "Kernel/User network link driver",
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below. If unsure, say N.
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config SYN_COOKIES
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bool "IP: TCP syncookie support (disabled per default)"
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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, note that SYN cookies aren't enabled by default;
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you can enable them by saying Y to "/proc file system support" and
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"Sysctl support" below and executing the command
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echo 1 >/proc/sys/net/ipv4/tcp_syncookies
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at boot time after the /proc file system has been mounted.
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If unsure, say N.
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config INET_AH
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tristate "IP: AH transformation"
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select XFRM
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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
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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_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 XFRM
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select INET_XFRM_TUNNEL
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select CRYPTO
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select CRYPTO_DEFLATE
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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_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 <http://developer.osdl.org/dev/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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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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depends on EXPERIMENTAL
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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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depends on EXPERIMENTAL
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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, expecially 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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|
depends on EXPERIMENTAL
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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
|
|
adjusts the sending rate by modifying the congestion
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window. TCP Vegas should provide less packet loss, but it is
|
|
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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|
depends on EXPERIMENTAL
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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
|
|
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-lce.eng.cam.ac.uk/~ctk21/scalable/
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config TCP_CONG_LP
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|
tristate "TCP Low Priority"
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|
depends on EXPERIMENTAL
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|
default n
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|
---help---
|
|
TCP Low Priority (TCP-LP), a distributed algorithm whose goal is
|
|
to utiliza only the excess network bandwidth as compared to the
|
|
``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"
|
|
depends on EXPERIMENTAL
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|
default n
|
|
---help---
|
|
TCP Veno is a sender-side only enhancement of TCP to obtain better
|
|
throughput over wireless networks. TCP Veno makes use of state
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|
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://www.ntu.edu.sg/home5/ZHOU0022/papers/CPFu03a.pdf
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|
|
choice
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prompt "Default TCP congestion control"
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default DEFAULT_CUBIC
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|
help
|
|
Select the TCP congestion control that will be used by default
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for all connections.
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config DEFAULT_BIC
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|
bool "Bic" if TCP_CONG_BIC=y
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config DEFAULT_CUBIC
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bool "Cubic" if TCP_CONG_CUBIC=y
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|
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config DEFAULT_HTCP
|
|
bool "Htcp" if TCP_CONG_HTCP=y
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|
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config DEFAULT_VEGAS
|
|
bool "Vegas" if TCP_CONG_VEGAS=y
|
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|
|
config DEFAULT_WESTWOOD
|
|
bool "Westwood" if TCP_CONG_WESTWOOD=y
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|
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config DEFAULT_RENO
|
|
bool "Reno"
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|
|
endchoice
|
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|
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endif
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|
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config TCP_CONG_CUBIC
|
|
tristate
|
|
depends on !TCP_CONG_ADVANCED
|
|
default y
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|
|
config DEFAULT_TCP_CONG
|
|
string
|
|
default "bic" if DEFAULT_BIC
|
|
default "cubic" if DEFAULT_CUBIC
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|
default "htcp" if DEFAULT_HTCP
|
|
default "vegas" if DEFAULT_VEGAS
|
|
default "westwood" if DEFAULT_WESTWOOD
|
|
default "reno" if DEFAULT_RENO
|
|
default "cubic"
|
|
|
|
source "net/ipv4/ipvs/Kconfig"
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|