Yet another question of multihoming. I know there have been lots of discussions on this, but no concrete answer.
My scenario is simple. I have a cisco 1800 router with one ISP connection now. Going to add another internet connection to this router.
On the LAN, i have users who need internet access. I also have a webserver which needs access from internet all the time.
I dont think ill have issues failing over outbound connection from LAN -> internet , with IP SLA and PAT overload with route-maps...
What I have issues with is the inbound connection to the webserver through both ISP's. there will be dynamic dns updates which will force traffic to ISP 2 if the ISP 1 IP is not reachable. But my issue is static NAT on the end router.. I would already have a static NAT for webserver pointing to ISP 1.. how will I add another NAT to ISP 2 , for me to accept traffic from outside to webserver thro ISP 2 ? I dont want to run BGP , or using any other device for multihoming. (note - i have an extra router which can be configured as backup, with the ISP 2 line, and doing static nat on that router ? )
and what would the route-map ISP-1 & ISP-2 contain ? what will be the source traffic that I would refer on the route-maps ? I presume each route-map will have the "set next-hop" to its associated ISP's default gateway ?
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