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Bronze

Incoming NAT query - Diagram

With a setup similar to the diagram - If I have multiple NATs configured on each device, using multiple IPs. When traffic comes in from the ISP looking for say 1.1.1.10 /24 I'm guessing the Firewall Outside Interface is aware of this IP being used in its config and replies back with it's Interface address?

Because the IP being sought is not the actual physical interface address, I'm curious as to how the ASA or any other device lets the traffic know - "I have that translation in my config"

Hopefully makes sense...

1 REPLY
VIP Purple

The ISP-router will send an

The ISP-router will send an arp-request for 1.1.1.35 and the ASA will respond to that query because there is a translation configured for that address. It's really that simple. ;-)


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