[CentOS] Routing local generted packets with fwmark

C. L. Martinez carlopmart at gmail.com
Wed Oct 13 05:22:20 EDT 2010


Hi all,

 I need to route local generated packages depending on which tcp or udp
service I need to use. To accomplish this I have configured two routing
tables:

[root at lothlorien ~]# ip ru ls
0:      from all lookup 255
32762:  from all fwmark 0x2 lookup FirstLan
32763:  from all fwmark 0x1 lookup SecondLan
32764:  from 172.25.80.10 lookup SecondLan
32765:  from 172.25.70.18 lookup FirstLan
32766:  from all lookup main
32767:  from all lookup default

My routing tables:

[root at lothlorien net]# ip ro show table FirstLan
172.25.70.16/28 dev eth1  proto kernel  scope link  src 172.25.70.18
default via 172.25.70.30 dev eth1

[root at lothlorien net]# ip ro show table SecondLan
172.25.80.0/24 dev eth1  proto kernel  scope link  src 172.25.80.10
default via 172.25.80.1 dev eth2

 And my iptables rule is:

 iptables -t mangle -A OUTPUT -p udp --dport 53  -j MARK --set-mark 1

But this doesn't works. This host is CentOS 5.5 based with two interfaces.

 What am I doing wrong??

 Thanks.
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