Re: Bizarre router issue

From: Allen McIntosh (nospam_at_mouse-potato.com)
Date: 02/09/05

  • Next message: Baho Utot: "iptables DNS port" 
    Date: Tue, 08 Feb 2005 19:19:57 -0500

    Ron Albright wrote:
    > Traceroutes and pings work but applications timeout.
    >
    > I have a Fedora Core 3 box set up as a router. We work on equipment from
    > various sites so I multi-home the Network card in the Fedora box so I
    > don't have to change IPs. I have a USR8200 set up as the Internet gateway
    > and as the default router for the Fedora box. There are various Solaris,
    > Windows 2000/XP and Linux boxes in the office all of which are set with
    > the Fedora box as the default router. Everything was working fine. I was
    > messing around setting up a USB modem on the Fedora box this morning for
    > dialin access and I rebooted it. After it came back up no applications on
    > any of the Windows boxes could access the Internet. The Linux and Solaris
    > boxes work fine. You can do traceroutes and pings to anything on the
    > Internet (including DNS names) from the Windows boxes
    A subsequent post of yours says you were using tracert. Traceroute uses
    UDP; I believe tracert uses ICMP. This may be a significant difference.

    Anyway, I'd suggest starting up your favorite packet sniffer on the
    output interface of the Fedora box. Then telnet to port 80 on something
    like google.com from a Linux or Solaris box. When (if) that works, try
    the same trick from a Windows box. See if you see any traffic. See if
    it's different. If that doesn't work, pick another port (e.g. ftp) that
    should be open and try that. (I assume you're checked that iptables
    isn't getting in your way.)

  • Next message: Baho Utot: "iptables DNS port"

    Relevant Pages

    • Re: Bizarre router issue
      ... > Traceroutes and pings work but applications timeout. ... > various sites so I multi-home the Network card in the Fedora box so I ... > any of the Windows boxes could access the Internet. ...
      (comp.os.linux.networking)
    • Re: Bizarre router issue
      ... > Traceroutes and pings work but applications timeout. ... > various sites so I multi-home the Network card in the Fedora box so I ... > any of the Windows boxes could access the Internet. ...
      (comp.os.linux.networking)
    • Bizarre router issue
      ... Traceroutes and pings work but applications timeout. ... I have a Fedora Core 3 box set up as a router. ... Internet from the Windows boxes and they work fine ...
      (comp.os.linux.networking)
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