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How to Assign Public IP to a device

Tags:
  • Asus
  • IP
  • Internet Service Providers
  • Networking
  • Devices
Last response: in Networking
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October 15, 2014 6:58:23 PM

Hi All,

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.

Thank you in advance for your responses.

Cheers!

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a b Ĉ ASUS
October 16, 2014 1:00:44 AM

Not with the standard software. Asus even though it has a more advanced OS it still is only a "gateway" and not a true router. It still can only take a internal subnet and translate it all to a single IP address. You would have to load dd-wrt to the box to get the function.

You are still going to have to ask the ISP how they managed to accomplish this. With only 2 ip they must be in effect mapping both IP to the same mac address of the wan interface of your router. They would either have to mess with their arp tables or they have done something strange like route a single ip to a ip within the same subnet. In either case your device would have to accept the traffic on a single mac address for both IP and then nat it to a internal address.

If you have a cable modem they may just allow you to have 2 mac addresses attached. If it works that way it may be simpler to either directly plug the second device into the modem or use a second router in the modem. Using a single router to accomplish this would require a fairly advanced and very non standard configuration.

The more normal method would be to give you a ip for your wan and then route a subnet to you.
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October 16, 2014 8:58:41 AM

If you put a hub/switch between ISP and WAN port of your router, you can setup another device at xxx.181 address and have it directly access the 'Net. Ask your ISP about proper IP configuration (netmast, gateway address), or check the router' status page.
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