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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