Re: Networking Problem

From: John Summerfield (debian_at_ComputerDatasafe.com.au)
Date: 08/01/04

  • Next message: John Summerfield: "Re: Tasksel is not what it was.... SOT question" 
    Date: Sun, 01 Aug 2004 09:07:56 +0800
To: debian-user@lists.debian.org

    Jonathan Barnes wrote:

    > 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.

    I _thought_ you might be Australian.

    >
    > [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.

    I don't know just that your tools are on Windows: boot Linux (Knoppix
    is fine) if you can. From there,
    traceroute x.com
    ping -R -c4 x.org
    and see where routing breaks.

    Also, on Debbie (the Debian box)
    sysctl -a | grep ip_ 

    -- 
Cheers
John
-- spambait
1aaaaaaa@computerdatasafe.com.au  Z1aaaaaaa@computerdatasafe.com.au
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  • Next message: John Summerfield: "Re: Tasksel is not what it was.... SOT question"

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