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Old 03-27-2012, 11:14 PM   #1
donalbane
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Registered: Jan 2011
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Question iproute2 in Debian lenny adds routes to the main table instead of desired table


I perform the following:
[1]Add "1 lan" to /etc/iproute2/rt_tables.
[2]Type "ifconfig eth2 up" to bring up eth2, and verify that there are no routes for it by typing "ip route show"
[3]Type "ip route add XXX.XXX.XXX.XXX dev eth2 table lan"
[4]Type "ip route add default via XXX.XXX.XXX.XXX dev eth2 table lan"
[5]Type "ip route flush cache"
[6]Type "ip route show table lan". There is no response.
[7]Type "ip route show table main". There are the routes that I added in steps [3] & [4].
Can someone tell me why the routes are added to the main routing table instead of to the lan table? The kernel version is 2.6.21.

Don
 
Old 03-28-2012, 03:53 AM   #2
nikmit
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I add routing tables by simply specifying them when adding the route, like in
ip route add default table 8 dev tun0
ip route show table 8
default dev tun0 scope link

I think it adds the routes to the default table because it doesn't recognise the named table you defined in the config file.
Did you restart the service/reboot after the changes in the config file?
 
Old 03-28-2012, 10:29 AM   #3
donalbane
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Yes, I executed "/etc/init.d/networking restart" after making the changes to rt_tables. I also just tried adding the route with a number like you did, but that didn't work either:

tcors01:/etc# ip route show
192.168.128.0/24 dev eth3 proto kernel scope link src 192.168.128.101
129.116.134.0/24 dev eth2 proto kernel scope link src XXX.XXX.XXX.XXX
192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.1
192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.1
tcors01:/etc# ip route add default table 1 dev eth2
tcors01:/etc# ip route show table 1
tcors01:/etc# ip route show table main
192.168.128.0/24 dev eth3 proto kernel scope link src 192.168.128.101
129.116.134.0/24 dev eth2 proto kernel scope link src XXX.XXX.XXX.XXX
192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.1
192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.1
default dev eth2 scope link
tcors01:/etc#

Don
 
Old 03-28-2012, 12:01 PM   #4
donalbane
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I upgraded iproute2 from the lenny version to the squeeze version (20100519-3), but this did not seem to make a difference.

I went ahead and rebuilt the kernel adding:
CONFIG_NETFILTER_XTABLES=m
CONFIG_NETFILTER_XT_MATCH_MULTIPORT=m
CONFIG_NETFILTER_XT_TARGET_CONNMARK=m
to the kernel configuration. I don't think they are required for iproute2, but I know that they are required for other things (Shorewall), so I put them in there.

After rebooting, I get the expected behavior from the "ip route add ... table lan" command. I'm not sure what the magic bullet was, but it is working for the moment, so I will mark this thread as solved.

Don
 
  


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