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I have these two public IPs from my ISP. As an example, let's say the two IPs are: XXX.XXX.XXX.180 and XXX.XXX.XXX.181. They are on the same range and right next to each other
When I access the GUI of my ASUS RT-AC68U router, it says on the network map that my WAN IP is: XXX.XXX.XXX.180, which is one of the two public IPs given by my ISP.
Is there a way to assign the second public IP (XXX.XXX.XXX.181) to a device connected to the ASUS router's ethernet port? If yes, I would be very grateful to know how.
I have been agonizing over this for days and I have called ASUS tech support to no avail.
No, only a very high grade router would support multiple WAN ip addresses or multiple WAN ports. NAT assumes that the traffic is coming in on the WAN port, and is then forwarded to the LAN host. so the first thing you need to tackle is how to get both public IPs active on the WAN side of your router. once thats done, you can configure forwarding either by port or DMZ to expose the lan host. – Frank Thomas – 2014-10-16T03:55:17.617
1your cheapest and most secure approach would be to install a switch and second router behind your ISP box side-by-side with your existing router. then attach the server to the new router, and statically configure both routers WANs with the desired public IP. then set up DMZ forwarding on the second router, to expose your server. – Frank Thomas – 2014-10-16T04:11:35.427
Thank you @FrankThomas! I guess I have to invest more on this setup. :) – dribble – 2014-10-16T04:20:32.147
Hi @FrankThomas! Just an addedndum... I do not know if this matters, but the RT-AC68U is being advertised as having dual WAN. It only has 1 WAN port though. Just trying out my luck as we are already stuck with this router. :) – dribble – 2014-10-16T06:56:39.097
in that case, I would contact asus for support, or download the manual. it may be that the dual wan feature is only for a specific model in the line/family, or they may provide you a means to add multiple IP addresses to the wan, even though it only comes from one source. It may work yet! – Frank Thomas – 2014-10-16T11:54:09.593
@dribble The 'dual wan' feature of the AC68U is not used this way... You can define LAN 4 as a WAN port for second backup internet connection, although with alternative firmware like DD-WRT you might be able to make this work. To be honest, Frank's suggestion of a switch and second router would likely be the easiest to implement. – acejavelin – 2017-03-20T03:01:58.180