From owner-freebsd-hackers  Fri Mar  7 21:45:42 1997
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To: Stefan Esser <se@ZPR.Uni-Koeln.DE>
cc: hackers@FreeBSD.ORG
Subject: Re: TCP/IP problem to one particular FreeBSD machine ... 
In-reply-to: Your message of "Fri, 07 Mar 1997 18:44:01 +0100."
             <199703071744.SAA02637@x14.mi.uni-koeln.de> 
From: David Greenman <dg@root.com>
Reply-To: dg@root.com
Date: Fri, 07 Mar 1997 21:46:46 -0800
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>I've been wondering about this for quite some time:
>
>The main German *.de.freebsd.org server machine is well 
>connected to my network, but I can't access it from my 
>FreeBSD-current system ...
>
>In the past, I often FTPed files to some other machine,
>and then to my system in a second step, for that reason.
>
>Now I tried to use CVSUP (after the splatter disk failure,
>I'm normally receiving CTM updates ...) and found, that I
>can't get a connection, again :(
>
>With FTP, I see that the remote end is reached, but the 
>connection seems to freeze before the login is complete.
>CVSUP seems to fail with a time-out after about one minute.
>
>I append the tcpdump log of an attempted CVSUP run. My end
>is "x14" (a PPP line to an ANNEX terminal server), and the
>CVSUP.DE.FreeBSD.Org system (Blues.Physik.RWTH-Aachen.De)
>is listet as "cvsup". Any ideas what is going on ?
...
>17:07:13.250732 x14.1124 > cvsup.5999: . ack 1 win 17280 <nop,nop,timestamp 37094 329189,nop,nop,cc 178> (DF) (ttl 64, id 53604)

   You have the TCP extensions enabled and your broken ANNEX is getting
confused. Set tcp_extensions=NO in /etc/sysconfig.

-DG

David Greenman
Core-team/Principal Architect, The FreeBSD Project