Date: Thu, 13 Mar 2008 15:49:27 +0000 (UTC) From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Mike Silbersack <silby@silby.com> Cc: freebsd-net@freebsd.org, "d.s. al coda" <coda.trigger@gmail.com> Subject: Re: TCP options order changed in FreeBSD 7, incompatible with some routers Message-ID: <20080313154547.F50685@maildrop.int.zabbadoz.net> In-Reply-To: <20080312232607.J60219@odysseus.silby.com> References: <f90b44e40803111756h517b373ala8afdff9395b7fac@mail.gmail.com> <20080312231330.D60219@odysseus.silby.com> <20080312232607.J60219@odysseus.silby.com>
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On Wed, 12 Mar 2008, Mike Silbersack wrote: > > On Wed, 12 Mar 2008, Mike Silbersack wrote: > >> I think we will need to fix tcpdump before trying to finish diagnosing this >> problem. We were missing key information before. >> >> -Mike > > Hm, that was far easier than expected. Patch attached. > > Here's what the two tcpdumps show now: > > 6.3: > IP A > B : S 2575736483:2575736483(0) ack 1762868649 win 65535 <mss > 1460,sackOK,eol,eol> > > 7.0: > IP A > B : S 3304309835:3304309835(0) ack 710421411 win 65535 <mss > 1380,sackOK,eol,nop> > > That makes the problem quite a bit more clear. Anyone working on this issue > should apply this patch ASAP. what do you think of this version? http://sources.zabbadoz.net/freebsd/patchset/20080313-01-tcpdump-print-tcp-option-padding.diff It should give you output like this: <mss 1396,nop,wscale 3,nop,nop,timestamp 3321226304 19549200,sackOK,eol,0x01[bad padding]> <mss 1396,nop,wscale 3,nop,nop,timestamp 574483947 19641135,sackOK,eol,0x00> <mss 1430,sackOK,timestamp 723328502 20006573,nop,wscale 6> -- Bjoern A. Zeeb bzeeb at Zabbadoz dot NeT Software is harder than hardware so better get it right the first time.
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