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    SubjectRe: Unexpected Acknowledgement / Stalled Connections
    On 2/4/07, Parag Warudkar <parag.warudkar@gmail.com> wrote:
    > I am running 2.6.20 and have trouble with stalled connections. For
    > instance, if I try to download a debian ISO image using wget, the
    > connection runs fine for few seconds and then stalls for ever.
    >
    > In my router logs I see a ton of messages like the below -
    >
    > [INFO] Sun Feb 04 17:22:03 2007 Blocked incoming TCP packet from
    > 192.168.0.174:34090 to 130.239.18.138:80 with unexpected
    > acknowledgement 3269301836 (expected 3269343453 to 3269408989)
    >
    > Where 192.168.0.174 is my laptop running FC6 and kernel 2.6.20 and
    > 130.239.18.138 is whatever cdimage.debian.org resolves to atm.
    >
    > What's going on here? Any TCP/IP tunable that I can set/turn on/off to
    > prevent this from happening?

    Turning tcp_sack off seems to cure it. Turning it on again makes the
    connections stall. Seems like the D-Link router doesn't like the SACKs
    linux sends?

    Parag
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