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From: Oscar Mechanic <oscar@ufomechanic.net>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] Problem with two providers:Need to route packets on
Date: Sat, 14 Oct 2006 11:56:14 +0000	[thread overview]
Message-ID: <1160826974.4371.12.camel@OSCARLAPLIN> (raw)
In-Reply-To: <000601c6ef81$692240f0$3b66c2d0$%lartc@neuf.fr>

There is a simple way a hard way to do this. You could use
connmark in iptables. And then use ip rule & routes to set
route based on that. As I am not going to replicate this to test
I wont try and guess commands.

Easiest configure 2 IP's on server.

DNAT like 
iptables -t nat -I PREROUTING 1 -i ethA -j DNAT --to-destination
<10.0.0.A> 
iptables -t nat -I PREROUTING 1 -i ethB -j DNAT --to-destination
<10.0.0.B>

ip rule add from 10.0.0.B lookup 120
ip route add default via <B ISP Address> table 120

Thats the easiest I can think of.



On Sat, 2006-10-14 at 13:10 +0200, KORTA wrote:
> Hello,
> 
>  
> 
> i would like to know how to resolve a problem.
> 
>  
> 
> I have a debian router with 3 interfaces (LAN, and two internet
> providers (Provider A, Provider B)).
> 
>  
> 
> The default route is configured to use the provider A
> 
>  
> 
> The problem is that,
> 
> When an external connection arrives from provider B to an internal
> server (with nat),  the packet is routed to the default route:
> 
> I explain:
> 
> -         A packet arrives from provider B in direction of a internal
> server
> 
> -         The router performs nat operation
> 
> -         The internal server generates a response
> 
> -         The router routes the packet on the interface Provider A
> 
>  
> 
> Consequently, The connection cannot been established 
> 
>  
> 
> I want to know if its possible to configure my debian router to route
> packets to the interface on which packet arrives. In the example,
> packets should have been routed by the interface connected to provider
> B
> 
>  
> 
> If yes, do you know how to do that ?
> 
>  
> 
> Thanks.
> 
>  
> 
>  
> 
> 
> _______________________________________________
> LARTC mailing list
> LARTC@mailman.ds9a.nlhttp://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc

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  reply	other threads:[~2006-10-14 11:56 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-10-14 11:10 [LARTC] Problem with two providers:Need to route packets on the KORTA
2006-10-14 11:56 ` Oscar Mechanic [this message]
2006-10-14 17:21 ` KORTA
2006-10-14 17:44 ` [LARTC] Problem with two providers:Need to route packets Oscar Mechanic
2006-10-18 17:53 ` [LARTC] Problem with two providers:Need to route packets on the KORTA
2006-10-19 12:56 ` Alessandro Ren

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