Networking Problem

From: Jonathan Barnes (webdwarf_at_jmconline.net)
Date: 07/31/04

  • Next message: Carl Fink: "Re: What are the dangers of using packages from both stable and testing?" 
    Date: Sun, 01 Aug 2004 00:53:05 +1000
To: debian-user@lists.debian.org

    Hi, I'm having a very strange networking problem that has my linux
    buddies and I stumped.

    I'll draw a basic mud map because it makes it ALOT easier to understand
    my situation as I have two gateways due to shared housing.

    [Bridged ADSL Modem]
             |
        [Firewall]
    (220.244.217.*, 10.0.1.1, 10.0.0.1)
         | |
       [DMZ] [Workstations] and [my Debian Box]
    (10.0.1.*) (10.0.0.*) (10.0.0.2, 10.1.1.1)
                                        |
                                 [my workstation]
                                    (10.1.1.22)

    Last week my Debian Box had a hard shutdown due to a knocked out
    powercable :( and when I rebooted it could no access the internet, other
    workstations, firewall or DMZ. And neither could my Workstation. The
    weird thing is, that all the above mentioned machines, can still contact
    my Debian Box. eg: The Firewall can ping my Debian Box, but my Debian
    Box can't ping the firewall. My Debian Box is hosting some friends
    websites and hosts some email accounts, which all still work. From my
    workstation I can ping my Debian Box and It can ping me, but in order
    for me to get on the net with my workstation, ive had to plug in with
    the rest of the workstations (ie: not go through my Debian Box)

    I have flushed all iptables rules and set policies to ACCEPT so it is
    not a firewall problem. I have tried 4 other NIC's and even put the hard
    drive in another box so it is not a hardware problem. I have also tried
    switching the IP's of eth0 and eth1 around and even set eth0 to use DHCP
    (provided by the Firewall)

    I cant see anything wrong with my routing table either:
    > Kernel IP routing table
    > Destination Gateway Genmask Flags Metric Ref Use Iface
    > 10.0.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
    > 10.0.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
    > 0.0.0.0 10.0.0.1 0.0.0.0 UG 0 0 0 eth0

    It's obviously not extra urgent because people can still access their
    websites and emails from the outside, It's just a pain. I can't even do
    an 'apt-get upgrade' in the hope of overwritting whatever it stuffing
    this up.

    Hope i've provided enough information and thanks for any help.
    - jrb 

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