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Cisco 1811 configuration

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So to clarify, you have two Internet (ISP) connections both coming in on the LAN side of the router? (port 2 and port 3).

This would imply you're using your router as a switch, effectively, as the router is only used to sort out the traffic between VLANs.

And it does not work when you plug one of those into the WAN port? That would be logical, assuming the WAN port is doing NAT, possibly DHCP, and normal firewall-type stuff like blocking pings.

If I have stated that correctly, the preferable way to do this would be to have WAN0 be one ISP and WAN 1 be the other can then configure the router to failover to the second one.