In order to perform routing you will need to use GRE....
The company I work recently discovered that when the IP phones at our remote branch offices kept going down; either the branches would get internet or their phones would work but it more hit-and-miss then anything else.
Provided that the Cisco gets the PSK key setting up is easy. I've done it home using OpenBSD 5 as mentioned in VBOX however, 5.1 was being a bit strange??
I am willing to share notes as the config is fairly straight forward.
The Cisco side is quite easy too as is just standard IPSEC with an additionally Tunnel interface.
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