Date: Thu, 20 Mar 2003 17:15:32 -0800 From: John Fitzgibbon <fitz@jfitz.com> To: Giorgos Keramidas <keramida@ceid.upatras.gr> Cc: freebsd-questions@FreeBSD.org Subject: Re: Repeated ACKs - possible DoS? Message-ID: <200303201715.32293.fitz@jfitz.com> In-Reply-To: <20030321004312.GA1964@gothmog.gr> References: <200303201408.53238.fitz@jfitz.com> <20030321004312.GA1964@gothmog.gr>
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On Thursday 20 March 2003 04:43 pm, Giorgos Keramidas wrote: > > X is remote. Y is server, (FreeBSD 4.7-STABLE, built 2003/01/06) > > > > tcpdump shows 2 remote connections repeatedly sending "ack 1": > > > > 09:16:10.236812 X.64670 > Y.http: . ack 1 win 32589 > > 09:16:10.236879 Y.http > X.64670: . ack 489 win 58400 (DF) > > Hmmm, is this repeatable? Can you try to grab the output of the > following command in a log file while it happens? > > # tcpdump -n -v -s 128 -XX port 80 > > - Giorgos I haven't seen this behavior before, and I don't know how to recreate it :( To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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