>Hello, everybody:
>
>I am experiencing a problem with network routing, I hope some of you can
>help me... Let me explain my problem to you:
>
>I have two lan segments: LAN "A" (215.192.10.0/255.255.255.0) and
>                         LAN "B" (216.192.10.0/255.255.255.0)
>
>I have three Linux boxes: all of them with Red Hat Linux 5.2,
>Kernel 2.0.36.
>
>The box #1 has one ethernet adapter and participates on LAN "A";
>The box #2 has TWO ethernet adapters and participates on both LANs: "A" and
>"B";
>The box #3 has one ethernet adapter and participates on LAN "B";
>So, box #2 is the router between LANs "A" and "B".
>
>I have configured (properly ???) all routing tables and firewall policies (see
>the outputs below); box #1 can successfully ping box #2 at its LAN "B"
>address;
>box #3 can successfully ping box #2 at its LAN "A" address but BOX #1 CAN NOT
>PING BOX #3 AT ALL.

On box #2, check in /etc/sysconfig/network and make sure FORWARD_IPV4=true appears in 
the file.
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