I’m trying to set up a conditional NAT configuration that only NAT’s ICMP from the LAN network to an address on the other side of the WAN (e.g. upstream networks). All other traffic I do not want to NAT. In other words, when I try to pint an upstream device, I want the pint to appear that it is coming from my WAN address interface, but all other traffic from a LAN connected device will just route traffic through the WAN interface without NAT. Can someone help me build this config?
Yes, that would work. You might want to specify the source address range in case you get additional LAN interfaces. Additionally, I’m not sure what other NAT rules you have but you may want to adjust the priority so something else isn’t matched first.