RE: [LARTC] Ip route cache problem

From: Ionut Popovici <ionut@topall.ro>
To: lartc@vger.kernel.org
Subject: RE: [LARTC] Ip route cache problem
Date: Wed, 12 Oct 2005 10:20:16 +0000	[thread overview]
Message-ID: <434CE360.7070608@topall.ro> (raw)
In-Reply-To: <434CCD50.3080104@objectlab.it>

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>Hello,
>I need some help about a routing problem on a complex configuration.

>The problem is that I can't reach from services outside from my DMZ.

>The scenario is a gateway linked to three internet connections, so that 
>I used three distinct iproute2 tables for routing. The gw is running 
>ipvs for balancing over the dmz's servers.

>DMZ servers are on 192.168.1.0/24 network, .

>Every table has the route to reach :
>192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.1

>I'm using iptables to NAT a server on my DMZ to reach DNS services outsides:
>iptables -t nat -A POSTROUTING -p tcp -s 192.168.1.0/24 -d 151.99.0.100 
>--dport 53 -j SNAT --to-source 81.77.88.99
Have u try to use DNAT from iptables because dnat is in PREROTING , and if u have a dns service u need to make the outside service connection to connect 2 your dns server !

>Looking inside the cache I find only the route to reach the dns server, 
>but not the one that the dns needs to reach my server:
>151.99.0.100 from 192.168.1.2 via 81.77.88.100 dev eth2  src 192.168.1.249
>    cache <src-direct>  mtu 1500 advmss 1460 metric10 64 iif eth0
>
>I experieced in the past that reentering the iptables nat command 
>worked, but it seems a random effect and not always works.
>
>Thank's in advance,
>Luca Maragnani


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