I have a problem with the Linux 2.5.6 kernel. I have three ethernet cards, eth0 eth1 and eth2. Eth0 is connected to my lan using IP a.a.a.a, and eth1 and eth2 are used for my bridge, and my bridge has the IP b.b.b.b. I do firewalling on the bridge too. The bridge firewalling works fine. I want to redirect any telnet traffic going through the bridge to the linux box. But, when I try to do this: iptables -t nat -A PREROUTING -i ! eth0 -p tcp -d 0/0 --dport 23 -j DNAT --to b.b.b.b it doesn't work. When I try to telnet to some server behind the bridge firewall I should get the Linux telnet login, but what I get it connection failed, connection refused. I have input output and forward policies all set to accept. I have IP forwarding turned on. I have a telnet server running. If I telnet directly to b.b.b.b I get a login. Why does this not work?
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