[cvsnt] Strange behaviour of cvs status on a VMWare server...

Bo Berglund bo.berglund at telia.com
Fri Oct 27 17:37:44 BST 2006

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On Fri, 27 Oct 2006 12:37:13 +0100, Tony Hoyle
<tony.hoyle at march-hare.com> wrote:

>Bo Berglund wrote:
>> Why this happens is beyond me and it sure looks like a networking
>> problem. The status commands produce the start of a display, sometimes
>> only the leading ==================== line and sometimes a few lines
>> more, but then it invariably stops.
>> This always happens with cvs status -v file1 file2, and sometimes also
>> with only one file mentioned.
>> But never with cvs status -q ....
>> Why is there a difference?
>Those symptoms look like packet loss of large packets - normally caused
>by misconfigured MTU across tunnels and/or broken PMTU discovery.  Other
>possibilities are a broken network card or switch.
>Compression would make this worse since it builds up a chunk of data
>before sending it, rather than sending line by line.

I had a possibly related problem a year or so back when I failed to
connect to the remote desktop of a PC on a remote network accessed via
Microsoft PPTP VPN tunnel.

The remote desktop was drawn up on my PC as a frame and then
everything stopped. After googling and asking on a microsoft NG I got
the advice to change the networking parameter:
value ProtocolMTU
Advice was that the value should be lowered until working.

I now have it set to 1300 (don't remember what it was before) and then
the remote desktop started to work properly again.

Is this the same thing, then I would like to know where to change it.
The above fix was connected to the VPN tunnel traffic.

Any hints?


(Bo Berglund, developer in Sweden)

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