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The Max MTU for PPTP (Point-to-Point Tunneling Protocol) Tunneling VPN on normal Ethernet connection on Windows 98/98SE/ME is 1462.
In Windows 2000/XP: For PPTP Tunneling VPN, it seems that 1400 is the Max MTU for Ethernet.
For now, there is no way to get over these MTU values. Every VPN (Virtual Private Network) Software needs a few bytes for security and in order to work.
Checked on: Windows XP and Windows 98 Second Edition. Windows built-in VPN Adapter. PPTP VPN Connection.
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