Setting up Site to site VPN when one side has a dynamic IP

[sunilsadanandan]

Hi ,

You can use the Easy VPN setup in Cisco ASA to create a site to site VPN from a remote site that does not have a static IP address associated with it. Is it possible to do the same when the Main Office device is a Palo Alto firewall ?

The remote office device will be a Cisco ASA configured to initiate a IPSEC connection to the corporate Palo Alto device. But I need Palo to be configured to accept the IPSEC connection irrespective of the source IP from which the ASA initiates the connection. Is this possible ?

If so , could you briefly describe how it is done ?

Regards,

Sunil

[Retired Member · Accepted solution]

Yes this is possible. On PA side you would need to be able to identify the peer by means other than IP. That usually means FQDN. So Cisco should send local ID as FQDN (i.e. vpn.domain.com). PA side should have same for peer ID. You will also need to have both sides in aggressive mode as well (default is main mode). Otherwise other parameters such as P1 and P2 proposals, preshared keys, proxy-ids, etc. are pretty much same.

Note that in this case the Cisco must always be initiator of the VPN.

-Richard

[sunilsadanandan]

Thanks Richard,

I will try it and confirm if it works.

[AubreyNicklaus]

So....did it work?