Dual Wan, separate location?

Good Morning,

I have two buildings that are owned by the same company. I think this may be a basic question, but they have a different ISP at each facility, and those two buildings are now linked wirelessly.....Can I set up either failover or load balance between the two locations and their respective ISP?

ISP1 ->Router1->LAN1->Wireless Link<-LAN2<-Router2<-ISP2

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More about dual wan separate location
  1. U just want to do this for you or the whole company?
  2. The whole company, to avoid downtime from an ISP outage......
  3. Typically, a failsafe function is handled by a single multi-WAN router, or two single-WAN router in the same room hooked up by a control cable. You situation then is not standard, I can't think "outside the box" stuck to what I know.

    In theory, it's very simple, the GATEWAY IP given by the DHCP to each client is THE DOOR TO THE INTERNET. If somehow you can command DHCP server to force a IP renew during switch over should do it. Exactly how, I haven't work out that part yet.
  4. If this needs to be done manually, could I just have both routers set up identically on the LAN side, and manually unplug one while plugging in the other. If any issues arise, devices can be restarted, but statics can be reserved in both so there's no conflict? Outside services like remote access would be unavailable, but that's not a big issue I wouldn't think?

    Thanks for the help so far, any other ways to do this?
  5. This tends to be why companies buy commercial equipment that can actually run routing protocols. The consumer boxes are more internet gateways even though they are commonly called routers even though they don't support actual routing.

    The largest issue is going to be changing the gateway in the end stations when the internet fails.

    The common hack design used by small companies would be to use static ip assignments. You would put router 1 on ip address and router 2 on You would then assign static ip to the end stations and assign the proper gateway they want to use.

    In normal operation all the machines can communicate and they use the proper internet.

    Switch in times of failure is the problem. Since the IP are static you would have to update the gateway in the end stations that have the internet failure.

    I can't think of a easy way to do this without a device that can change the gateway...ie change the route. A lot of this can be done with third party firmware on consumer routers but it is messy. It is not exactly simple even if you had commercial equipment....mostly it is the complexity of the commercial equipment for new people to the networking field
  6. I should have noted that we use Edgerouters by Ubiquiti. Is there functionality in these, I realize they're not Cisco, but maybe? Does dd-wrt do this?(not that I like that option)?
  7. njxc500 said:
    any other ways to do this?

    If u can make a business case for this, am sure there will be funds to hire a consultant$$.

    The boss will probably say though, if there is an outtrage , we will just send people across the street to finish their work! :)
  8. Valid point that may be the next step, what sort of company would I hire to do this?
  9. njxc500 said:
    I should have noted that we use Edgerouters by Ubiquiti. Is there functionality in these, I realize they're not Cisco, but maybe?

    Ask them. Do you have any High Availability Internet solutions?
  10. It depends how the device detect that internet is down. Many times the physical connection stays up it just does not pass data.

    So let say again you have and In default mode the router will send the default route to the wan port. Lets say the router detected the wan port was down it could change the default route to send the traffic to the router. Since this router still has a good wan route it will send it out. The reason this works is the actual data packet have destination ip on the internet the nexthop is done via mac addresses so when 1 router sends it to the other it does not really know that it was not sent directly.

    The traffic will run async but it will not hurt. Traffic would go pc---route2---route1----internet---router1----pc
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