[ale] Networking problem with 3 nics

[Chuck Huber]

I'm having a real problem adding a DSL line to my gateway.
It appears that packets are making it in to the system,
however, they're not making all the way up the stack.

Here's the scenario:
    From an unrelated host on the Internet, if I ping my
    DSL address, tcpdump shows the packets coming in and
    ifconfig shows them being received, however, no echo
    reply is produce.

    Also, if I ping the unrelated host from here, tcpdump
    shows the echo requests going out, and the echo replies
    coming back, but ping shows no responses.

At first I thought this was a firewall problem - something
somewhere is too tight.  That suspicion was quickly debunked
when I flushed the iptables to no avail.

Here's the setup:
    2.4.9-31 kernel (RH 7.2)
    eth0: external to cable modem
    eth1: internal LAN (192.168.x.x)
    eth2: external to DSL modem

Everything going out the cable modem works fine.  This problem
exists only on eth2.

Ideas would be more than welcome.

Thanks,
    - Chuck

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