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What is the Max MTU for PPTP VPN ?

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The Maximum MTU for PPTP tunneling VPN using Ethernet in Windows 9x/ME is 1462.

In Windows XP/2k/2k3, it seems to be limited to 1400 by default.

See this Microsoft article for changing the Max MTU value in Windows XP/2k/2k3:

MS KB 826159

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