Date: Mon, 26 Feb 1996 21:46:44 +0100 (MET) From: guido@gvr.win.tue.nl (Guido van Rooij) To: pmac@til_cad1.kasten.on.ca (Peter MacKenzie) Cc: questions@freebsd.org Subject: Re: invalid option in TCP header Message-ID: <199602262046.VAA05875@gvr.win.tue.nl> In-Reply-To: <199602261727.JAA02503@freefall.freebsd.org> from "Peter MacKenzie" at Feb 26, 96 12:30:15 pm
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Peter MacKenzie wrote: > > Is there an invalid option in the option list of the TCP header with > FreeBSD 2.1.0? > > When I open a telnet session the first packet has the SYN control bit > correctly set. The first four bytes of the TCP options correctly refer > to the maximum segment size however the next byte is a no operation option > (01, should this be an end of option list) and the next one is (as far > as I am aware) an invalid option (03). Does BSD expect that this should > be ignored or is there a new option that I am not aware of? This is the window scale factor. Thta has been around for a long time. There are others as well. See rfc1323 (window scale and timestamp) and rfc1644 (T/TCP). -Guido
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