FW: GRE Blues Open BSD -> Cisco

["Shane Cosgrove" <subscribe@networksmm.com.au>]

The trouble we were having was solved by ensuring that ifconfig gre0 tunnel
was the mirror of the cisco source and destination addresses.

The main mistake we made was that the route must point to the other end of
the gre interface, not the destination address of the tunnel.

On cisco router
> #####################################
> interface Tunnel1
>  ip address x.x.103.241 255.255.255.252
>  tunnel source x.x.96.233
>  tunnel destination x.x.100.26

On OpenBSD Box
########################################
ifconfig gre0 x.x.103.242 x.x.103.241 netmask 255.255.255.252 link0 up
ifconfig gre0 tunnel x.x.100.26 x.x.96.233
route add x.x.96.0/24 x.x.103.241

This is all the interface configuration that was needed.

Hope it helps anyone else with the same probs. Thanks to all those that
helped out.

I am now trying to figure out why adsl performance to the openbsd router is
great but when we access it via the machines behind the openbsd box we loose
speed and performance even though we can traceroute out to the internet
fine.





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