vpn trouble

[ralf at dzie-ciuch.pl]

> 
> I managed to do an IP in IP tunnel with IPsec encryption between a 
> FreeBSD and a cisco router running 12.1(mumble) several years ago.
> 
> It is a desirable option if you want to use routing (e.g. ospf). You 
> can't route an IPSec tunnel (actually, is this now possible with enc0 
> interfaces?) but you can route to the gif interfaces.
> 

Can you tell me how to use route command to use it like above?