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Subject: Windows 2000 and MTU
From: "Tom Parker" <tparker,AT,netspace,DOT,net,DOT,au>
Date: Sun, 23 Mar 2003 14:01:20 +0100


I've got a linux box connected to a win2k box working quite well (can ping
everything ok).  I am however loosing packets and seeing the error counter
incrementing in the linux network statistics.  Ethereal running on the
windows box shows windows is sending huge 4k NFS packets that get
fragmented.  The packets are sent with size 1498 bytes (without
encapsulation) as shown by capturing on the tunnel interface (not the NIC
card).  Given the MTU below I've tried hacking the windows registry to force
the MTU down (as per
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q314053) but am
still getting these large packet transmissions.  I've tried forcing the MTU
down on both the tunnel and the NIC card with no success.

Anyone have any ideas?


# ifconfig cipcb0
cipcb0    Link encap:UNSPEC  HWaddr
          inet addr:  P-t-P:
          UP POINTOPOINT RUNNING NOARP  MTU:1430  Metric:1
          RX packets:1372 errors:2495 dropped:0 overruns:0 frame:2495
          TX packets:1418 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:1664136 (1.5 MiB)  TX bytes:284072 (277.4 kiB)

Tom Parker tparker,AT,netspace,DOT,net,DOT,au

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