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We have two ISP's named as A and B, are connected with RV325 Router. Is it possible to route A ISP to specific private IP without NATing

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  • I hope you are running the latest firmware for that router.
    – user56700
    Jun 4 '19 at 11:45
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    If you don't use NAT, how will ISP A handle return traffic?
    – Ron Trunk
    Jun 4 '19 at 11:58
  • Private networks cannot communicate with the public Internet, except through NAT.
    – Ron Maupin
    Jun 4 '19 at 13:20
  • Did any answer help you? If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you can provide and accept your own answer.
    – Ron Maupin
    Dec 15 '19 at 3:44
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Without NAT your endpoint requires a public IP address - generally, you can only connect public-public and private-private without NAT.

(It is possible to mix public/private in certain scenarios like a public-IP DMZ that is connected to your LAN router directly.)

If you want to route a specific destination through a defined WAN interface you can just set up a route pointing that way, e.g. 1.0.0.1/32 -> ISP A. Depending on the device at hand, more specific routes (longer prefix) are usually preferred before less specific routes (short prefix). If not you can use route metrics to set the preference.

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You will need to the router to have policy based routing and or source based routing which will let you specify when to route the traffic acrross ISP A , what are you trying to accomplish? Do you want traffic that matches your ISP A public IP to go directly to an specific host in your LAN? , if that is the case you could try using portforwarding but NAT is always going to be there as long as you use Private and Public IPv4 routing.

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