im facing issue where a firewall with a outside interface is not receiving public ip adresses from the isp router , the isp router is showing it is own interface which is connected to the firewall as the arp destination for the public ip subnet instead of the router , so i was wondering can i add multiple ip addresses to the PA layer3 outside interface?
@chuckles for what do you want to use the additional IP addresses? If you need them for making internal/dmz servers available to the internet or for source NAT IPs for outgoing connections then you actually only need to configure the required NAT rules - that's it. This way your firewall automatically responds to ARP requests for these IPs
Guess I'm thinking of it a bit differently. Say an ISP assigns you x.y.w.z/27, I should not have to assign my external interfaces that subnet. The ISP should route that subnet out its interface that I connect to. That is how all of our ISP's are setup currently.
hope that makes sense.
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