I have created a simple VPN lab between a Pix (outside) and a 2620 (fas 0) router using a crossover.
All is working and I can ping the loopback 0 interface on the router from my laptop connected to the inside interface of the Pix. For the "outside" IP's I've only used 172.16.1.1/30 and 172.16.1.2/30.
I have now changed one outside interface to a 10.10.10.1/30 and changed the config to reflect this but the VPN stays down. I thought arp would locate this IP and bring the tunnel up? I just want to different IP's to connect like a real VPN, possible?