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The VPN tunnel fails to come up on the PIX Firewall after the ISP changes the IP address for the remote device
What is a VPN Tunnel?
A “tunnel” is simply a link between two locations through some other material. A good analogy is a tunnel that goes under a mountain. Both sides of the mountain are linked up through a direct path; in this case the “mountain” is the Internet. So essentially a tunnel is a direct shortcut through the Internet.
Although by definition a tunnel is not encrypted, typically the reason that you are creating one is that you want to add some encryption to it. Let’s say you have a branch office in one location using a regular Internet connection and then you want to connect to a server somewhere at your main office location. Since the data you are transferring between offices is likely sensitive, you wouldn’t want someone to be able to view that data while travelling over the Internet. That is where a VPN tunnel comes into play.
In order to resolve this issue, replace the old IP address with the new IP address using these commands on the PIX Firewall: