[CentOS] Routing local generted packets with fwmark
Mitja Mihelič
mitja.mihelic at arnes.si
Fri Oct 15 10:23:49 UTC 2010
On 10/15/2010 08:48 AM, C. L. Martinez wrote:
>
> On Wed, Oct 13, 2010 at 11:22 AM, C. L. Martinez <carlopmart at gmail.com
> <mailto:carlopmart at gmail.com>> wrote:
>
> 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 <http://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 <http://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
>
I had a similar problem, so I wrote the mark as 0x1 :
iptables -t mangle -A OUTPUT -p udp --dport 53 -j MARK --set-mark 0x1
--
MM
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