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Getting 2 static IPs out of a modem / router?
Im working on a system that was a typical non static setup with a fairly typical modem / router that I believe has several physical jacks on the back of it. There is then a single wire to a switch that is the regular existing network. We are adding some equipment that requires a dedicated static IP. We had our ISP change our account to static and then add a second IP. The new system has its own router. The old system ideally wont change. Sorry I dont remember the modem model number but the question is can a typical modem / router be set up to basically do what it has always been doing on the existing network but pass that second addy to my new router? Or will I have to put that modem into bridge and get a second router for the other network. If I have to go the 2 router method will I need another switch to split the now bridged modem? Or can the internal stuff still act like a switch. Im dont currently have the model number of the modem / router so I realize that any answer wont be 100%, Im just hoping to hear if that is something a typical model can do.
2 Answers
- AdrianLv 710 years agoFavorite Answer
If you have two static IPs from the ISP, to a single modem, the modem will simply allow them to pass through. The problem you will run into is that most routers can handle only one IP at a time on the WAN side.
What you may be able to try, is to put a switch right after the modem, then plug two routers into the switch. Assign each of the two routers each one of those static IPs. It can work, as I myself have 5 static IPs going to a switch first, then 4 addresses to one Linux firewall, and the fifth address mapped to a separate router where my service comes in.
The other option is to use a higher end router/firewall, like a Linux firewall. Linux firewalls can be assigned any number of IP addresses on a single WAN port.
A final option is to re-flash a router that supports DD-WRT, as I believe that will support multiple WAN IP as well, and just use that. The issue you will have with just one router (DD-WRT) or firewall (Linux), is how to pass traffic based on IP address. You will have to define rules and NAT mappings. The first solution I mentioned above removes any of those issues, you simply use two routers for two separate networks. (they have to be isolated logically anyway).
If you have two separate feeds, like two modems and two Ethernet jackes, you can just keep them isolated and use them as-is. However, if you want to have your internal LAN see both subnets, you either need to get two static IPs in the same range so you can just set the subnet mast to allow traffic to cross over to both networks (only one gateway for both). That may get confusing, and a lot depends on how your ISP has created these two IP addresses for you. If they are totally different, the best you could do is maybe get a Linux based firewall that can do load sharing, with automatic fail-over if one service goes down.
- johntrottierLv 710 years ago
The easy way to do it is set up a second modem and router for the second network.
A single modem (if it has the capacity)may work, but you will be far better off with two separate systems