PMTU - PathMTU Discovery

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PROBLEM:

Slow file transfers and backups with different servers

There have been a couple of different issues that I have run into regarding MTU and PMTU.
resolve the issue of the server only sending frames off net at only 590 bytes. I have also had this issue relate to disconnects, as the server with the wrong setting get so busy (due to the small packets) that it was not sending acks in a timely fashion.

http://www.netheaven.com/pmtu.html


Solution:

recommended that the servers’ mtusize discovery bit be set to “1”, to prevent 576 bytes and use your full packet size.

For Windows XP:
From Microsoft:

Key: Tcpip\Parameters
Value Type: REG_DWORD - Boolean
Valid Range: 0,1 (False, True)
Default: 1 (True)
Description: If you set this parameter to 1 (True), TCP tries to discover the Maximum Transmission Unit (MTU or largest packet size) over the path to a remote host. By discovering the Path MTU and limiting TCP segments to this size, TCP can eliminate fragmentation at routers along the path that connect networks with different MTUs. Fragmentation adversely affects TCP throughput and causes network congestion. If you set this parameter to 0, an MTU of 576 bytes is used for all connections that are not to computers on the local subnet

http://support.microsoft.com/default.aspx?scid=kb;en-us;314053

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