I am new to routers, and am hoping someone can help me configure this simple setting.
Basically we have two 1841 routers, each with an internet connection (different ISPs). One is primary (all internal clients point their Default Gateway to this routers LAN interface IP), and the second router is in-case the primary router loses internet connectivity.
I want the primary router to auto fail over all requests it receives from inside clients, to the secondary router's LAN Interface IP, when it detects its internet interface is DOWN, or not functioning.
Is all I need to do is specify a second 0.0.0.0 0.0.0.0 route that points to the IP of the second router, or will I need to configure something else? Or is what I am trying to do even possible?
Thanks a lot for any help or suggestions on how better to accomplish my goal.
HSRP will fulfil your requirements. You need a config like the one below - susbstitute IP and other values as per your setup. Configure the standby IP of the HSRP as the default gateway for all your clients.
The primary router will track the ISP_interface and decrement the priority when the interface goes down and the backup router will start routing traffic at that point. Once the ISP_interface comes back up on the primary router it would preempt and start routing for the LAN clients.
When primary goes down the backup router will become the active router. On non-receipt of 3 (i believe) hellos from the active router, the backup router would consider the active router to be down and will become the active router.
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