TCP options order changed in FreeBSD 7, incompatible with some
routers
Bjoern A. Zeeb
bzeeb-lists at lists.zabbadoz.net
Thu Mar 13 08:50:07 PDT 2008
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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