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In some cases: 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.
 got feedback?These numbers are good as far as they go. I support remote offices connected via router-to-router PPTP VPN tunnels. Some of the offices are connected to the internet via PPPoE aDSL circuits. The MTU for PPoE is 1492. The PPTP implementation on my Netopia routers appears to require 40 bytes per packet. That allows a maximum MTU of only 1452 across the VPN tunnel. 2007-09-19 10:09:15 by B777300 | |||||
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