From: Mike N. 

On Wed, 26 Jul 2006 23:19:57 -0400, "Geo"  wrote:

>I have lots of things set on the news server to prevent nasties, even some
>anti MAC spoofing stuff. Any one of those settings could have an effect if
>the packets are weird in some way.

   I did another test from Linux telnet (horrors - command line, but I was
too lazy to install another news reader).   This time I figured out how to
recreate the problem in Telnet.  I did a test from Windows telnet and the
problem did not show up.

   By inference, the server either sends a packet that never gets there.
The server goes into PMTU discovery mode and somehow ends up dropping back
on the MTU size.

   A close inspection of the packet streams in Wireshark shows that Linux
appends 12 bytes of TCP packet "options".   I'll have to research this
further.   Perhaps Windows cannot deal properly with this field.   Or maybe
'Windows isn't done until Linux won't run".

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