From mboxrd@z Thu Jan 1 00:00:00 1970 From: Luca Maragnani Date: Wed, 12 Oct 2005 12:52:29 +0000 Subject: Re: [LARTC] Ip route cache problem Message-Id: <434D070D.6000006@objectlab.it> List-Id: References: <434CCD50.3080104@objectlab.it> In-Reply-To: <434CCD50.3080104@objectlab.it> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lartc@vger.kernel.org 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 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 > > >_______________________________________________ >LARTC mailing list >LARTC@mailman.ds9a.nl >http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc > > _______________________________________________ LARTC mailing list LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc