topic Re: tunnel IP address in General Topics

tunnel IP address

Gregoux — Wed, 24 Jul 2013 16:22:51 GMT

when do you need to affect an ip address to the a tunnel interface?

Re: tunnel IP address

kprakash — Wed, 24 Jul 2013 16:26:14 GMT

Hi Greg,

Are you talking about when do we configure IP address on a tunnel interface?

We use an IP address on a tunnel interface when:

a) Using VPN tunnel monitoring, ie pinging from the tunnel interface to a destination behind the remote peer

b) Using dynamic routing protocols to learn routes via the tunnel interface. We cannot have an unnumbered tunnel interface to participate in dynamic routing.

Hope that helps!

BR,

Karthik

Re: tunnel IP address

goku123 — Wed, 24 Jul 2013 16:26:57 GMT

Two most common uses would be:

1. Tunnel monitoring: so that the firewall can send pings sourced from tunnel interface to a remote endpoint to verify phase 2 reachability.

2. Dynamic routing over VPN: If you would like the firewall to learn remote network routes using a dynamic routing protocol such as OSPF, you would have to assign an IP to the tunnel interface so that the firewall can use the tunnel IP to neighbor with a remote router over the VPN.

Re: tunnel IP address

Gregoux — Wed, 24 Jul 2013 16:42:16 GMT

another way that i found

is when you need to implement PBF to route to the tunnel interface

you need to implement an IP address on tunnel interface

and the next hop in the PBF rule need to be define with tunnel ip address.

Re: tunnel IP address

Vdionisio — Fri, 03 Dec 2021 08:19:43 GMT

You can also define No IP Address on the Next Hop for Policy Based Routing though?