multiple tunnels from same natting ip, and double nat

A

ArcreVich

Guest
Hi everybody, I need an advice :
We have a service in a centos box with public ip which need to identify its clients by ip, for billing purposes. A lot of those clients ( mostly Linux, but also smartphones and other proprietary devices ) are behind a nat, and even a double nat.
We started thinking about vpn, : ipsec, l2tp/ipsec, pptp and gre behave enough well with nat, but none of them allows more than one tunnel per every public ip ( I googled over this for days ) ; openvpn seems the right solution, but some netadmin won't allow it on their devices.
Did someone face a similar problem ?
TIA

Arcre
 


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