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Unusual Network Behaviour

Discussion in 'Networking Issues' started by crossmr, May 24, 2006.

  1. crossmr

    crossmr LI Guru Member

    My home network consists of the following:
    HP Photosmart 2575 Printer (connected via NIC)
    1 Dimension 8400 XP pro (clean not dells), Fedora Core 5 (Broadcom adapter)
    1 Dimension 4600 XP home (Intel adapter)
    Toshiba Tecra A3 FC5 (wired NIC) (Marvell/Yukon)
    Mutt Media Center PC connected via Linksys USB Wireless device (not usually on or connected, not on during my problem)

    2 routers:
    Linksys BEFSX41 connected to DSL router, main router that has the firewall
    Linksys BEFW11S4 connected to the other router used only to provide wireless for the media center and laptop if I need it. Dimension 4600 is connected to this, however it does no routing, DHCP, etc.

    Symptons:
    Degraded network performance
    ethereal reveals wireless router sending out 20-30 or more packets per second labelled Zerowindow packets. Destination is 0.0.0.0 seq # is 0.

    Occurance:
    This has occured twice. First time was 2 months ago. I installed VMware to check out a few different linux distros. At the time the 8400 was not dual boot. I installed FC5 as I was using FC4 at the time. I also installed Linspire as I'd never seen it and there was an article on slashdot at the time. After using both for a short period of time I noticed the above behaviour.

    Second time occured today. I set up the 8400 as a dual boot system and noticed GAIM having connectivity issues. I passed it off but got curious when I got back to Windows and noticed Trillian having issues. I discovered the same behaviour. I ran FC5 all last night, and all day today.

    The laptop running FC5 has been conencted to the network for about 3 weeks or so straight.

    Solution: Powering down both routers for 30 seconds and restarting them seems to clear this behaviour. I have never had this problem before, or since or in between.

    I really don't feel like this is a coincidence, and after all the hours I invested in getting FC5 working nicely as a dual boot, I'd hate to have to remove it. Does anyone have any idea what might be causing this problem, and what the solution may be? I'm not willing to change the OS or hardware, as I don't really see any reason any of this shouldn't work together.
     
  2. Toxic

    Toxic Administrator Staff Member

    What ports do you use to connect the BEFSX41 to the BEFW11S4?

    LAN Port to LAN port?
     
  3. crossmr

    crossmr LI Guru Member

    Uplink on the BEFW11S4 to port 3 on the BEFSX41, but I can't see that being the issue as this behaviour has only presented itself during these two instances. I've never noted any other time where these packets have begun flooding the network.

    I should mention the 4600 and the HP Printer are wired into the BEFW11S4. But it does no routing, so they shouldn't really be interacting with the router itself since their gateway is the BEFSX41, and neither have been observed doing anything strange when this happens.
     

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