From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Beverley <andy@andybev.com>
Subject: Re: iptables udp 1195 MASQUERADE
Date: Fri, 10 Feb 2012 15:57:16 +0000
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On Fri, 2012-02-10 at 00:05 -0600, Enrique Huerta de la Fuente wrote:
> I have four interfaces and the default gateway is eth1
> 
> - eth0 (LAN)
> - eth1 (internet link)
> - eth3 (internet link)
> - ppp0 (internet link)
> 
> I mark (mangle) package udp (1195) for out by interface ppp0.
> "iptables -t mangle -I OUTPUT -p udp -m udp --dport 1195 -j MARK --set-mark 1
> 
> and when i try MASQUERADE the package udp (1195) with "iptables -t nat
> -I POSTROUTING -p udp -m udp --dport 1195 -o ppp0 -j MASQUERADE", does
> not work!!

I'm still not sure exactly what you're trying to achieve. Presumably you
want different traffic going out on different interfaces, source-natted
to that interface IP address.

If so, why not route your traffic as you are already doing (I assume
that is working) and then just MASQUERADE each interface:

iptables -t nat -I POSTROUTING -o ppp0 -j MASQUERADE

Andy