I am looking to modify the MTu settings in the bin directory of the secureclient/securemte directory, which is set to 1500 by default, i am modifying this to troubleshooting my ailing GPRS connectivity, each time i modify it and reboot it comes up with original default settings, is there anyway of actually forcing these changes permanently.
Try using a tool to change the MTU registry settings for the network interfaces. Should be available as PD somewhere. For example the SetMTU tool supplied with the Cisco VPN-clients works, but I am not sure about the licensing of this program.