Re: 2.6.7-mm1 - 2.6.7-mm4 weird http behavior

From: Stephen Hemminger (shemminger_at_osdl.org)
Date: 06/29/04

  • Next message: Mark Haverkamp: "Re: PATCH: Further aacraid work" 
    Date:	Tue, 29 Jun 2004 11:22:56 -0700
To: Debi Janos <debi.janos@freemail.hu>

    On Tue, 29 Jun 2004 15:20:06 +0200 (CEST)
    Debi Janos <debi.janos@freemail.hu> wrote:

    > I am found an interesting (bug?) feature in kernels between
    > 2.6.7-mm1 and 2.6.7-mm4
    >
    > Some web pages eg.
    >
    > http://www.hup.hu/
    > http://portal.fsn.hu/
    > http://wiki.hup.hu/
    >
    > is unreachable with these kernels. If i try kernel versions
    > <= 2.6.7 everything is O.K. above-mentioned all web pages works.
    >
    > I try this web pages with some different operating systems
    > like Windows, OpenBSD, FreeBSD, WinCe... and seems working
    > fine for me.
    >
    > Any idea?

    Dave enabled the receive buffer auto-tuning which uses TCP window
    scaling. It looks like all these sites are running FreeBSD, perhaps
    there is a bug in FreeBSD?

    As suggested earlier please get a TCP dump of a failed connection.

    To turn of receive buffer auto-tuning:
            sysctl -w net.ipv4.tcp_moderate_rcvbuf=0
            sysctl -w net.ipv4.tcp_default_win_scale=0

    Thanks.
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