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PMTU Auto Discovery
Enabling this setting causes TCP to attempt 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 is supposed to be able to eliminate fragmentation at routers along the
path that connect networks with different MTUs. This requires implementation of the corresponding server side algorithm,
however, and presupposes all of the servers on the entire Internet only running MSFT server software with server-side
optimization features accessible from MSFT web-browser client software. Needless to say, this is rather unlikely.
Nevertheless, it is not recommended to disable this setting as it would then cause an MTU of 576 bytes to be used
for all connections that are not to machines on the local subnet. Disabling this setting can cause severe performance
degradation because fragmentation may not be compensated for. PMTU Auto Discovery is Enabled by Default.
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