1811 Router Failover w/ 2 Connections - No NAT

Answered Question
Jun 24th, 2009

I am trying to accomplish the same things as a number of others on the forums here but I do not wish to use NAT as this will be an internal router on private Metro-Ethernet connections. I have prepared and attached a diagram displaying what I would like to do. Basically, I need my default router to be router A unless there is a failure. Right now everything is static. I'm all for doing dynamic routing if that is required. Please let me know if you need any additional information. The biggest difference between my setup and other is no NAT.

I have this problem too.
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Correct Answer by John Blakley about 7 years 5 months ago

You can use statics for this setup. Is this your default route out to the internet as well? If so, you can do:

ip route 0.0.0.0 0.0.0.0 10.30.31.254

ip route 0.0.0.0 0.0.0.0 10.30.30.254 250

If you're just needing to get to that network, you can use:

ip route 10.20.20.0 255.255.255.0 10.30.31.254

ip route 10.20.20.0 255.255.255.0 10.30.30.254 250

I'm looking at the perspective of Router C. Your other routers will handle it from there.

HTH,

John

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Correct Answer
John Blakley Wed, 06/24/2009 - 07:24

You can use statics for this setup. Is this your default route out to the internet as well? If so, you can do:

ip route 0.0.0.0 0.0.0.0 10.30.31.254

ip route 0.0.0.0 0.0.0.0 10.30.30.254 250

If you're just needing to get to that network, you can use:

ip route 10.20.20.0 255.255.255.0 10.30.31.254

ip route 10.20.20.0 255.255.255.0 10.30.30.254 250

I'm looking at the perspective of Router C. Your other routers will handle it from there.

HTH,

John

clamasters Wed, 06/24/2009 - 07:27

Thank you John. I would assume in this setup, that if 10.30.31.254 were to disappear, it would then be removed from the routing table and the default route would then be my 250 wighted route?

John Blakley Wed, 06/24/2009 - 07:30

Yes. And you generally give it an AD higher than any routing protocols since you'd want the routing protocols to take over if you were running them. In your case, since you don't have any now and you only have the one router, I think statics would do fine for what you're needing.

The floating route will only get put in the routing table once the main route dies.

HTH,

John

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