Re: Very strange: Cannot access any sites although connection apparently good

From: David Clymer (david_at_zettazebra.com)
Date: 02/16/04

  • Next message: Kent West: "Re: Mouse" 
    To: Debian-User <debian-user@lists.debian.org>
Date: Mon, 16 Feb 2004 11:42:49 -0500

    On Mon, 2004-02-16 at 08:55, Anthony Campbell wrote:
    > I have a very strange problem.
    >
    > 1. If I connect via my ADSL modem everything works perfectly.
    >
    > 2. If I connect via my Netgear MR814 rounter and the modem everything also
    > appears to work (dig, ping are OK) but no web sites are accessible. The
    > names are resolved but at the last stage the browser (any browser) fails
    > to connect.
    >
    > 3. It is not a hardware problem because on Knoppix there are no problems
    > and a second computer connected to the router also works perfectly.
    >
    > There must therefore be something wrong or corrupt on my desktop but I
    > have no idea how to find it.
    >
    > Any suggestions where to look?

    Do you have ECN enabled?

    $ cat /proc/sys/net/ipv4/tcp_ecn

    (1 == on, 0 == off)

    If so, its possible that your netgear router does not handle ECN packets
    properly.

    try:

    $ echo 0 > /proc/sys/net/ipv4/tcp_ecn

    and see if that makes any difference.

    -davidc 

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