I have a linux running firewall/router machine, connecting LAN to the internet with two interfaces (no load balancing or other connections). One is a fast connection with dynamic IP (ADSL) which is the default route, the other is a static IP (T3) connection (used for mail sever and other services available from www).
Additional I want to provide our intranet (located in the LAN) access to workes outside the office, using a port on the static firewall IP, which will be redirected (dnat) by iptables prerouting rule and allowed forwarding to LAN intranet sever port.
The scenario is woking when the T3 connection is default gateway in the main routing table. It is not working when I switch the default gateway to the ADSL connection.
The incoming packets are trackable with tcpdump and dnat redirect in the prerouting table is working (notification in syslog by iptables). Missing are the packets on the interface to LAN and the forwarding notification by iptables is also missing. So I think this is a routing problem.
I hope someone can help, or getting me clues what to check.
Thank you,
Oliver
Here is some information on the network topology and snips from the routing/firewall script:
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