I have Cisco RV110W Wireless router. WAN port was burned after a storm. Can I use one of LAN ports as WAN?
Looking under "Switch Settings" I can't find solution. In the Cisco documentation, I could not find a solution either.
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The Cisco RV110W device you have contains a dedicated WAN port. This is a physical hardware port intended for this purpose. You will not be able to reassign WAN functions to one of the four switch ports.
More importantly, equipment damaged in an electrical storm really should not be trusted. You're going to have to replace this router.
I believe DD-WRT will this, e.g. to set up the other LAN ports under separate, NATted subnets, and other neat tricks. DD-WRT is a complete firmware replacement, that installs a very small version of Linux, and the tools necessary to manage it. You can find it at dd-wrt.org, with probably a better explanation, instructions, and so forth.
dd-wrt is probably a 4 out of 5 on a technical scale to get installed, but if you find this intriguing, i might be worth it at least to try since it's not a router otherwise.
this forum indicates the hardware is the same is a Cisco E2000, so that image is known to work:
01/06/15 edited for grammar/clarity