From: Luca Maragnani <luca.maragnani@objectlab.it>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] Ip route cache problem
Date: Wed, 12 Oct 2005 12:52:29 +0000 [thread overview]
Message-ID: <434D070D.6000006@objectlab.it> (raw)
In-Reply-To: <434CCD50.3080104@objectlab.it>
Sorry, surely I did'nt explained well the problem.
I don't have DNS services. I need to access dns server at 151.99.0.100
from my servers which have private ip addresses. I think the only thing
I need is to SNAT the connection.
Thank's all the same
Luca
Ionut Popovici wrote:
>> 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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prev parent reply other threads:[~2005-10-12 12:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-12 8:46 [LARTC] Ip route cache problem Luca Maragnani
2005-10-12 10:20 ` Ionut Popovici
2005-10-12 12:52 ` Luca Maragnani [this message]
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