Date: Thu, 22 Feb 2001 17:56:26 -0500 From: "Matthew Emmerton" <matt@gsicomp.on.ca> To: <Mark.Andrews@nominum.com> Cc: <freebsd-stable@FreeBSD.ORG> Subject: Re: ipfw drop syn+fin Message-ID: <00aa01c09d22$b0b20700$1200a8c0@gsicomp.on.ca> References: <200102222237.f1MMbVh38760@drugs.dv.isc.org>
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> > Say a web client has a few connections to a web server. One of those > > connections is retriving an image (for example). When it's finished, it > > will send a FIN to the server to close that connection. However, at the > > same time, the web client wants to open a new connection to the same > > machine, which requires a SYN to be sent. The smart TCP/IP stack on the web > > client will set both the SYN and FIN bits in one packet, which means "close > > this connection, and open a new one." > > No, it means open this connection with this data then start to > close it as this is the only data I am going to send you. It > saves a few round trip times. I stand corrected. (Now that I've had a chance to think about it, what I explained is impossible!) -- Matt Emmerton To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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