Outside->In with commercial connections

Hi All,

Trying to understand how to set up a site that has redundant commercial connections, like a comcast router and a fios router in front of a cisco router. If we have services that rely on using a public IP to connect outside->in on a few specific ports from a few specific sources those sources would have to use a public ip from one of those two carriers. I don't think we have the ability here to advertise IP space to the carriers, so how can we make the site reachable when we fail from the IP of one provider to the IP of the other? Do we just give the provider both IPs? Is there a more elegant way to solve this? Some sort of VPN from the provider to a central point on the network? Any info on how that would be set up? How would we do this for multiple sites?

Thanks