@Jeesoon1 Yes, that is called double nat.  While it is not recommended to NAT twice it should work fine in most situations.

  @Alex789 

Yeah, i just want to see an update for multiple NAT. been using different router for that purpose only.  Hope TP Link router implement it already.

  @Jeesoon1 Multiple NAT meaning having more than one WAN IP address tied to a single interface or something else?

  @Jeesoon1 I am running a double nat setup ISP>>LinuxFW>>ER605>>switch>>

The Linux firewall (IPFIRE) is doing the NAT from there I have a static route to the ER605's WAN port, that is were the second NAT takes place.

On the LAN ports of the switch my DHCP clients get an internal IP address..

from the 605.

You have to open ports on the 605, if you want to access your internal devices line a NAS, game server or webserver from outside the network.

Hope this helps. 

  @Alex789 

Yes, my ISP got me /29. for example 123.123.123.100/29 and i want to use some of them on single interface.

  @Jeesoon1 I think that is available in standalone mode.

I feel like I read a recent post stating here it was on the roadmap for the controller as well but I can't find that now that I am looking for it.

  @KLX 

Did by any chance you have a basic configuration ?

  @Jeesoon1 If I understand your question the setup was pretty basic before adding the Linux Firewall creating the double nat. 

  @KLX 

yes, i was kindly puzzled about using those port forwarding and public ips. so the linuxfw is the one still setting up those things.