you can use "Check gateway" in route to see whether Modem is reachable or not.
if want to see whether the ISP is reachable you can use netwatch. it will do what ever you put in the script field. change DG, enable or disable route and etc.
I am using PCC with 3 ADSL modems that is dialing the internet, so whenever 1 goes down, the internet goes Haywire, until I disable that Ethernet port. So How do i implement that scipt to check over 3 Gateways?
I know, But since I set It up with that Remote Failover, When a Connection gets opened on 1 of my adsl lines, it forces it to a different line, and therefore take alot longer to open a site