I have a situation where I need, what I'll call, a high availability router to provide fail over between a cable service, and adsl service, from 2 separate ISPs. There is no requirement for outside access just high uptime requirements for internet access from the lan to the internet. At present I'm looking at just running a perl, or shell, script to ping the gateway and then fail over to the opposite interface, and vice-versa. Anybody know of a better way to do this, or have any experience with a similar situation?