Quoting Les Mikesell lesmikesell@gmail.com:
This should give you an interface that looks real enough to run zebra with rip or ospf and at least in theory it should work the same with a cisco at the other end.
I've just ran into one interesting problem with this approach. Seems that Netfilter is getting confused or something... Or at least I wasn't been able to make an usable config.
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