AirPort Wireless Leopard Mac-Mini  Setting the MTU size

Does anyone know how to set the MTU size for the wireless ?
Setting the MTU on the Ethernet is easy now that an Advanced>> custom is available for the Ethernet interface. But no such interface exists for the Wireless NIC card. The MAC default = 1500 and for use in PPTP VPNs that causes issues and I would like set the MTU to 1200
PPTP works great with Ethernet set for 1200
also using Fusion and windows VM I can set the MTU size for the wireless and PPTP works great inside the Windows VM
Now if i could just set the MTU for the wireless when operating in normal MAC OS

Open a terminal window, and, assuming your airport interface is called "en0", enter the following command :
+ifconfig en0 mtu 1200+
You'll have to do this each time you restart the system, though, so you might want to setup a startup script yourself or use a third-party utility to do so.

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