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    SubjectRe: After many hours all outbound connections get stuck in SYN_SENT
    On Wed, 19 Dec 2007, Eric Dumazet wrote:

    > James Nichols a écrit :
    > > On 12/19/07, Eric Dumazet <dada1@cosmosbay.com> wrote:
    > > > James Nichols a écrit :
    > > > > > So you see outgoing SYN packets, but no SYN replies coming from the
    > > > > > remote
    > > > > > peer ? (you mention ACKS, but the first packet received from the
    > > > > > remote
    > > > > > peer should be a SYN+ACK),
    > > > > Right, I meant to say SYN+ACK. I don't see them coming back.
    > > > So... Really unlikely a linux problem, but ...
    > > >
    > >
    > >
    > > I don't know how you can be so sure. Turning tcp_sack off instantly
    > > resovles the problem and all connections are succesful. I can't
    > > imagine even the most far-fetched scenario where a router or every
    > > single remote endpoints would suddenly stop causing the problem just
    > > by removing a single TCP option.

    You could also check if you can pull same trick off by touching
    tcp_timestamps. It affects the TCP header as well.



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