[lwip-users] VPN Client for incoming PPP connection

[Marco Jakobs]

Dear LwIP users,

we are running LwIP (1.3.2) with FreeRTOS on a ATMEL AT91SAM7X512 
embedded controller for our projects. Here we have implemented a small 
NAT routing to allow the usage of our device to connect devices on the 
ethernet port to a radio network which is connected by PPP.

We have now the requirement to connect the device(s) on the ethernet 
port by VPN to a master PC without NAT modification (so that they are 
accessible with their LAN IP's), so we need to be a VPN client to 
fulfill this.

Is there a VPN implementation for LwIP or has anybody realized this? 
Will it generally be possible to do this with LwIP (what support of the 
stack will be needed for this?)? At least, how many ressources must be 
available for such an extension?

Any thoughts are highly appreciated ... ;-)

BR
Marco