Package: dhcp3-client
Version: 3.1.1-6+lenny3
Severity: wishlist
'man dhclient-script' invites a bug report of this nature:
In general, customizations specific to a particular computer should
be done in the /etc/dhcp3/dhclient.conf file. If you find that you
can't make such a customization without customizing
/etc/dhcp3/dhclient.conf or using the enter and exit hooks, please
submit a bug report.
dhclient should support a way of specifying the routing table it
should use. For instance, I have two ISPs both configured with dhcp.
I want the one on eth1 to use a different routing table so I can have
most traffic go through eth0, except replies to inbound connections on
eth1.
The work around I use requires an exit hook, and hence this bug report:
/etc/dhcp3/dhclient-exit-hooks.d/local-routing-table:
---cut---
# File: local-routing-table
# Purpose: modify dhclient-script to allow a routing table to be specified
# for each interface
# Author: Brett Wuth
# Created: 2009-08-30
#
# Initials:
# BCW - Brett Wuth
# @#[ContactWuth:
# Phone: +1 403 235-2972
# E-mail: supp...@castrov.cuug.ab.ca, w...@acm.org]
#
# HISTORY:
# $Log:$
# @#[BasedOnTemplate: sh version 18]
# Debugging:
# exec 2>/tmp/"$(basename $0).$(date "+%F_%T")_$$.log"
# set -x -v
# Implementation:
#
# Allow dhclient-script to set up routing table for $interface using
# "ifconfig" and "route" commands. Once it's set up, move the routes
# for $interface from the default routing table to our $routing_table.
#
# Alternatively we could change dhclient-script to use "ip" commands
# because "ifconfig" and "route" don't have an option to specify the
# routing table. Then add an to dhclient.conf to specify the table.
#
# Or we could do the above but define an "ip" function in
# dhclient-enter-hooks.d which added the table to the command.
#
# Or we could leave dhclient-script unedited and define "ifconfig"
# and "route" in dhclient-enter-hooks.d to reimplement the commands
# via "ip".
#
# This approach was approach was chosen because it's the smallest
# change.
function routing_table_of_interface {
# Name the routing table that should be used for $interface.
# Empty string if default routing table.
case "${interface:-}" in
( "eth1" )
echo TELUS
;;
esac
}
routing_table="$(routing_table_of_interface)"
function routing_table_move {
# If we have a routing table, move any routes created in the default
# routing table into ours.
if [ -n "$routing_table" ]; then
# copy the routing to our table
ip route show | grep "$interface" \
| sed -e "s/.*/ip route add & table ${routing_table}/" | sh
# delete it from the default table
ip route show | grep "$interface" \
| sed -e 's/.*/ip route del &/' | sh
fi
}
routing_table_move
---cut---
This approach cannot be use as "post-up" in /etc/network/interfaces
because those scripts are not called when dhclient does a renewal.
To complete the solution, I do use the interfaces to enable the
routing table:
---cut---
# The secondary network interface -- telus ADSL
allow-hotplug eth1
iface eth1 inet dhcp
# /etc/dhcp3/dhclient-exit-hooks.d/local-routing-table
# will cause configuration to be in routing table TELUS.
#
# Use routing table TELUS for replies from eth1 while that interface
# is up.
post-up ip rule add from $(ifconfig eth1 | grep "inet addr:" | sed -e
's/.*inet addr://' -e 's/ .*//') table TELUS
pre-down ip rule del from $(ifconfig eth1 | grep "inet addr:" | sed -e
's/.*inet addr://' -e 's/ .*//') table TELUS
---cut---
-- System Information:
Debian Release: 5.0.2
APT prefers stable
APT policy: (500, 'stable')
Architecture: i386 (i686)
Kernel: Linux 2.6.22-14-generic (SMP w/2 CPU cores)
Locale: LANG=en_CA.UTF-8, LC_CTYPE=en_CA.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages dhcp3-client depends on:
ii debconf [debconf-2.0] 1.5.24 Debian configuration management sy
ii debianutils 2.30 Miscellaneous utilities specific t
ii dhcp3-common 3.1.1-6+lenny3 common files used by all the dhcp3
ii libc6 2.7-18 GNU C Library: Shared libraries
dhcp3-client recommends no packages.
Versions of packages dhcp3-client suggests:
pn avahi-autoipd <none> (no description available)
ii resolvconf 1.42 name server information handler
-- debconf information:
dhcp3-client/dhclient-needs-restarting:
dhcp3-client/dhclient-script_moved:
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