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ipconfig: Document /proc/net/pnp 

Fully document the format used by the /proc/net/pnp file written by
ipconfig, explain where its values originate from, and clarify that the
tertiary name server IP and DNS domain name are only written to the file
when autoconfiguration is used.

Signed-off-by: Chris Novakovic <chris@chrisn.me.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Chris Novakovic 2018-04-24 03:56:36 +01:00 committed by David S. Miller
parent de1fa15b66
commit 8b0b37c564
1 changed files with 29 additions and 5 deletions
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34
Documentation/filesystems/nfs/nfsroot.txt
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@ -110,6 +110,9 @@ ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>:
will not be triggered if it is missing and NFS root is not
in operation.
Value is exported to /proc/net/pnp with the prefix "bootserver "
(see below).
Default: Determined using autoconfiguration.
The address of the autoconfiguration server is used.
@ -165,12 +168,33 @@ ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>:
Default: any
<dns0-ip> IP address of first nameserver.
Value gets exported by /proc/net/pnp which is often linked
on embedded systems by /etc/resolv.conf.
<dns0-ip> IP address of primary nameserver.
Value is exported to /proc/net/pnp with the prefix "nameserver "
(see below).
<dns1-ip> IP address of second nameserver.
Same as above.
Default: None if not using autoconfiguration; determined
automatically if using autoconfiguration.
<dns1-ip> IP address of secondary nameserver.
See <dns0-ip>.
After configuration (whether manual or automatic) is complete, a file is
created at /proc/net/pnp in the following format; lines are omitted if
their respective value is empty following configuration.
#PROTO: <DHCP|BOOTP|RARP|MANUAL> (depending on configuration method)
domain <dns-domain> (if autoconfigured, the DNS domain)
nameserver <dns0-ip> (primary name server IP)
nameserver <dns1-ip> (secondary name server IP)
nameserver <dns2-ip> (tertiary name server IP)
bootserver <server-ip> (NFS server IP)
<dns-domain> and <dns2-ip> are requested during autoconfiguration; they
cannot be specified as part of the "ip=" kernel command line parameter.
Because the "domain" and "nameserver" options are recognised by DNS
resolvers, /etc/resolv.conf is often linked to /proc/net/pnp on systems
that use an NFS root filesystem.
nfsrootdebug