We have an application server that our company's branches connect to. Right now, they can connect because the E.R.P app developer configured our main router for port forwarding. They connect by typing into a web browser. is the router's interface connected to the ISP ( made up).

Our internal subnet is on the subnet, the server in question is We have 2 ISPs connected to 2 different routers, one is for backup in case the primary goes down. I want to configure the backup router (Cisco RV042) for port forwarding but I am a bit confused regarding which ports and addresses to use.

Assume is the IP address of the second router's interface connected to the ISP. How would I forward this to my application server?

  • Can you give your private IP range and what IP/port the application server is listening on? – Ryan Foley Feb 21 '14 at 14:48
  • We are using the /24 subnet and the app server is its listening on port 9001. – dennix2014 Feb 21 '14 at 14:54

It doesn't look like you're doing any complex port forwarding with this setup. All you need to do is specify a private IP address for inbound requests to port 9001 to head to. -------->

You can access the port forwarding options on the RV042, under Setup > Forwarding

Check out the full RV042 Manual for more information, page 14 has more info on Port Forwarding.

  • thanks very much for the prompt reply. i really appreciate ur help. correct me if im wrong, the traffic originates from our branches with a source port of 80 (http) and a destination port of 9001 ? if that's true, isnt 80 supposed to be somewhere in the forwarding statement ?? – dennix2014 Feb 21 '14 at 17:22
  • No, based on your OP; signifies that your trying to connect to on port 9001. Verify that your application server is listening on port 9001. Linux would be lsof -i -n. If you're listening on port 80, let me know so I can modify the answer accordingly. – Ryan Foley Feb 21 '14 at 20:37
  • Honestly, i don't really know the port the server is listening on. I just guessed that since our branch offices had to type into a web browser to gain access, then its 9001. – dennix2014 Feb 22 '14 at 13:33
  • @dennix2014 That's fairly common if you're hosting multiple servers on your network that are all expecting HTTP connections. Go to the server that's hosting the service, and figure out what ports are open and listening. – Ryan Foley Feb 22 '14 at 13:54
  • Thanks Fizzle for all your help. i found out that the app is listening on port 9001. – dennix2014 Feb 24 '14 at 10:22

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