Re: route outgoing smtp via a specific interface

[Alexander Samad <alex@samad.com.au>]

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On Mon, May 03, 2004 at 02:30:32AM +0200, Christer Ekholm wrote:
> Antony Stone <Antony@Soft-Solutions.co.uk> writes:
> 
> > Ah.   Sorry if my previous response seemed a little terse - I did not realise 
> > you were aware of iproute2 and had tried so much of it already.
> 
> Don't be sorry, your assumption was perfectly valid.
> 
> >
> >> I think my problem is that I need this to work from the host with the
> >> connections to the providers. (localhost).
> >>
> >> My next thought was to use iptables to add a SNAT rule. But SNAT is only
> >> allowed in POSTROUTING, and I think I would need that in OUTPUT
> >
> > I would recommend that you do try such a rule, since POSTROUTING happens after 
> > OUTPUT (and FORWARD).
> >
> > Try:
> >
> > iptables -A POSTROUTING -t nat -p tcp --dport 25 -j SNAT --to 217.215.183.181
> >
> 
> Ok, that almost makes it work. tcpdump shows the packets with the
> correct sourceaddr, and I can see the returnpackets also. But they
> doesn't seem to reach my telnet process, because it just sits waiting.
> 
> $telnet vishnu.netfilter.org 25
> Trying 213.95.27.115...

On a different thought can't you tell your mta to bind to a specific
interface or use a specific address ( I can with exim)

> 
> --
>  Christer
> 
> 

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