[CentOS] Multiple ISPs

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?

Thanks,
Neil Jolly


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