How configure 1:1 NAT that "client fw" configure IP like IP Alias?
I have a pfsense with an WAN IP and a routed public subnet.
The public subnet is configured as IP Alias and I can set 1:1 NAT to LAN (or VLAN subnets) IPs which works like a charm.
Now I want to setup a second "client" pfsense on a VLAN (e.g. 172.16.1.0/24) subnet.
My steps would be: 1:1 NAT of a public IP to 172.16.1.1, so the client pfsense has its public IP.
But what if I want to add a second public IP?
Of course I can set another 1:1 NAT to a specific IP in that VLAN (e.g. 172.16.1.20).
How to achieve that the client pfsense set its "own" IP Alias?
Or wait a Minute: is not the second IP (172.16.1.20) the IP Alias?