Help setting 1:1 NAT. Multiple IP on same WAN

[UnCoNoob]

Hey,

I need some help to enable 1:1 NAT. I have 2 x IP from my service provider but I am unable to correctly set up 1:1 NAT.

I have a feeling it is a gateway issue.

The 2 IP's are way different and don't share the same subnet. like so 119.18.15.* and the second is 159.196.45.*

Most places say to set the WAN as static but when I do this the gateway won't automatically set up and manually setting it won't apply. When in DHCP it the gateway finishes.1 I try to set this manually in the gateway but it does not allow if so have turned WAN back to DHCP so the internet will work.

So onto the second IP.

I set a virtual IP with the IP they provided. Then set up a gateway I tried to set it with the .1 but says The gateway address "" does not lie within one of the chosen interface's IPv4 subnets.

If I set the gateway address the same as the IP address this works and says its online.

In firewall NAT 1:1 I set WAN the External IP service provider set and my internal IP I want to use that address for. Enable it all and save.

I get IPv6 address but no IPv4 address when set like this.

I know the virtual IP says proxy ARP I tries IPalias first was seeing if that matters