iphone on demand vpn connection based on ip

[Snelvuur]

So on the 'beurs' we had a small talk about iphones and vpn connections.

I've followed lots of tutorials, but the best spot to read is http://www.derman.com/blogs/Setting-Up-iOS-OnDemand-VPN
Basicly this wants you to make a certificate based trust, and use that as a profile that you have to install on your phone which uses the openvpn client.

So far i got it to work that whenever i am using a 192.168.x.x adres on the phone it will automaticly start openvpn client for me. The only thing that i did not get working was that it also drops the vpn after xx minutes. Even closing the apps that use it still doesn't matter. I have to turn it off manually and then only when i go to 192.x again it starts up.

Anyone feels lucky to dive in to this? Requires the openvpn client with a certificate (so no passwords) and a mac would be handy, since you can download the profile manager for it. (easy to make profiles then, and provision if needed)

[Edwin2008]

Sorry, no iPhone.
I think the disconnecting part would be difficult because only you know when you don't need the vpn anymore. Only solutions I can see is either a automatic disconnect after preset time or when you end the app that's using the vpn.

[Snelvuur]

If no traffic goes towards 192. it should just stop, this is not something that should be so hard. It is advertised in the profile as an option so i would believe it is possible. Could be just wrongly implemented but you never know.