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WAN-side VRRP with one ISP on Dynamic IP

Hello,

 

This is for home use...

I have Time Warner Cable at my house with a Dynamic IP Public Address.

 

I have to implement VRRP into my network so I can have redundant routers incase one fails. I'm not completely sure as how this would work because I don't have multiple IP addresses from TWC.

My pre-summed topology:

TWC > Modem > Switch > 2 Cisco Routers > Switch > Computers

 

Now my biggest concern is that only one of those routers is going to get a DHCP address from TWC. How would I setup the other router? Or what is the best way to implement redundancy in my case?

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