Help with FreeBSD Bridged Firewall

From: William Knechtel (webmaster_at_endikos.com)
Date: 07/30/03

  • Next message: William Knechtel: "RE: Help with FreeBSD Bridged Firewall" 
    To: freebsd-net@freebsd.org
Date: Tue, 29 Jul 2003 18:56:25 -0600

    Hello!

    Help!! I'm running a PC with dual NICs and FreeBSD 4.8 for a bridged
    firewall. I've got a private IP 10.0.0.1 tied to the internal card on the
    box for remote management. The firewall blocks any 10.x traffic coming in on
    the external card, so to remotely admin it, I have to shell into a machine
    on the same isolated network segment that it's on, and then shell over from
    that machine.

    Today around noon, the machine suddenly stopped responding to pings. I went
    down to the server room and couldnt find anything wrong. No notes on the
    console screen, no anomalous entries in the security or message logs. So, in
    the interest of getting it back up quickly, I rebooted it. That worked.
    About an hour later, the same thing happened... my network monitor tells me
    that it's not responding to pings. So before I go down to the server room, I
    run a few tests... the firewall is still blocking packets like a champ. I
    run nmap against a host the firewall protects, and everything comes back
    fine. But when I go downstairs to the console, I can't ping out to it's
    10.0.0.2 buddy, and no incoming pings work either. I'm at a loss on how to
    troubleshoot this, folks. I could really use a few ideas, so please send
    them along!

    Thanks in Advance!
    Bill

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