I've been working with Linux for such a long time and I'm not sure what that VPN client is. Truth is, though most popular network devices (Cisco, etc.) use VPN that Linux supports, it's Microsoft's VPN system that's most prevalent in the companies I've encountered. Does anyone know which VPN system works with MS? The choices for Linux I'm aware of are Open/FreeSWAN (IPSec), Cisco VPN 5000 client, PPTP VPN and OpenVPN (SSL-based).
OpenVPN sounds like a decent choice for porting, as it runs in userspace, but afaik it's not compatible with MS (or any other VPN solution). However, it does run on Linux, *BSD, OS X and Windows (I've seen it ran on WinXP, not sure about Vista but it should do well). It's also pretty secure (uses SSL and can use HMAC too). I haven't looked at the code though so I can't say if it would be easy to port or not.
Security is very important to roaming devices which have to go through public infrastructures like the Internet.
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