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What is "MTU Discovery" ?

MTU Discovery ( RFC1191 ). Determines whether TCP uses a fixed, default maximum transmission unit (MTU) or attempts to find the actual MTU. Under Windows 9x, if the value of this entry is 0, TCP uses an MTU of 576 bytes for all connections to computers outside of the local subnet. If the value of this entry is 1, TCP attempts to discover the MTU (largest packet size) over the path to a remote host.

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