[FRUCT] » Seamless WLAN off-load of 3GPP

We need to simple server/client program which is able to work through 2 interfaces

From Jari

a). ok, you get real routable IP address over PPP (assigned to ppp0 driver at least in my Merlin XU870 3G card). You need to access your application server with this address via Internet. Your application server therefore has to be in the internet.
b) you have also another server, the IPSEC server. As soon as the PPP address has been learned, it has to be configured for the IPSEC server so that when the UE next time will setup a IPSEC tunnel with it via WLAN, it will receive this PPP address as inner IP address (VPN address)
b) now when UE does handover to WLAN, you must lauch a script in the application server, which adds a new route to application server for the PPP address.
This new route shall direct the traffic toward your IPSEC server in the application server.
c) at the same time when UE establishes the IPSEC 'VPN' connection with the IPSEC server via private WLAN access, the IPSEC server assigns the PPP address to the UE.
d) you should have now IPSEC connection over WLAN with the PPP address as UE address. Of course UE can only access services in your application server.