There is a Secure VPN option for the Flowpoint routers, which are now owned by Efficient Networks. They don't use IPSec, they use Layer 2 Tunneling Protocol or L2TP which is something Microsoft and Cisco developed. While L2TP does solve some problems with IPSec and Network Address Translation, it is not compatible with IPSec implementations and uses manual key management. 56 bit DES encryption is used which is the lowest strength we would recommend anyone use today. Also, to my knowledge, Efficient has gotten any outside certification for the Flowpoint secure VPN.

So by buying the Secure VPN option for all your flowpoint routers you could have an inexpensive way of setting up a VPN between those routers but I would ask Efficient about outside testing of their VPN security and also be aware that you will not be able to interoperate with anyone using other products.

Regards, John Pescatore