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    SubjectRe: Linux Router
    i used to add proxy arp's on the router when i had problems like 
    this. Dunno if it's the recommended fix, but it worked.

    http://en.wikipedia.org/wiki/Proxy_arp

    Carlos Narváez wrote:
    > This is starting to frustrate me, because it should be much simpler
    > than it seems to be, and I feel like I'm missing something small and
    > obvious.
    >
    > I have two private networks, we'll say 192.168.254.0/24 and
    > 192.168.251.0/24. And I have a linux box in the middle with addresses
    > 192.168.254.17 and 192.168.251.10:
    >
    >
    > +---------------+ . +----------------+
    > ¦ 192.168.251.1 +---+ 192.168.251.10 ¦ . +----------------+
    > +---------------+ . ¦ 192.168.254.17 +---+ 192.168.254.16 ¦
    > . . . . . . . . . . +----------------+ . +----------------+
    >
    >
    > There is no NAT involved.. I just want the box in the middle to pass
    > traffic between the two networks. Here is what I have done:
    >
    > - IP Forwarding has been enabled on the router via "echo 1 >
    > /proc/sys/net/ipv4/ip_forward"
    >
    > - A route has been configured on 192.168.251.1 to point all traffic
    > for 192.168.254.0/24 to 192.168.251.10.
    >
    > - A route has been configured on 192.168.254.16 to point all traffic
    > for 192.168.251.0/24 to 192.168.254.17.
    >
    > - The command "iptables -I FORWARD -j ACCEPT" has been executed.
    >
    > Now.. here's what happens. 192.168.251.10 can ping both interfaces on
    > the router. 192.168.254.16 can also ping both interfaces on the
    > router. However, 192.168.251.1 cannot ping 192.168.254.16, and
    > likewise, 192.168.254.16 cannot ping 192.168.251.1.
    >
    > What have I forgotten?
    >

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