I'm trying to setup a second ISP as a backup link in case my main ISP goes down. How do you handle the public DNS records so my website is accessible if ISP1 goes down?
Basically this is how I thought I needed it setup.
LAN1 ----- /---ISP1
Need a little more information to answer that.
Do you have your own address range, or is the "public' IP address ISP allocated (and managed)?
If you've got your own address range, is it hosted on/behind the ASA? And where are your DNS servers located?
If you're going to end up with a different "public" IP address in the event of failure of one ISP, then the only solution I can see if manual change fo the DNS records once you're reconfigured your link. If you have your own IP range, then one link being down shouldn't affect it - you'd be running BGP, and BGP would simply delete the route being advertised via the broken link.
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