I have nortel vpn router 1750 in our main site and PA-500 in the branch, I need ipsec tunnel between devices. Nortel has static IP, but PA dynamic. I found that Nortel has site-to-site, initiator and responder options. which option I have to use site-to site or responder? can PA become Initiator in this case?
As you have a Dynamic IP on one of the boxes I suggest you setup aggressive-mode VPN. As the PAN is using a dynamic IP it's best if the PAN inititates the tunnel.
The dynamic ip is always the initiator in a site to site vpn where one of the peers is dynamic. There is no way to static peer can be the initiator.
Reason being the static has no idea about its peer's ip address if it wants to act as an initiator.
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