>Basically GRE allows to tunnel not only IP over IP, but also provides
>for other protocols like Appletalk etc. Cisco routers do their multicast
>tunnels over GRE (1). The hope is, that with GRE encapsulation, a method
>is found to encapsulate all other protocols with one mechanism and reduce
>the need for own tunneling in ip_mroute etc.

so...(feeling a little foolish) does this accomplish anything that
couldn't be done using tun0 and a suitable userspace daemon?

what's the difference?

hypothetical aside: would i better off using tun0 or gre0 to implement
pptp for netbsd?  not that i'm that crazy, but maybe...

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