Have a Cisco 2821 that currently has the 4esw-Hwic.  There is currently a fiber/ethernet internet connection on it, want to add an additional Internet connection and have it failover, preferably to specific Lan networks, But I'm not sure it's possibl...

Ok, here is a problem that has me absolutely stumped, hopefully I'll find an answer here among the geniuses.  about 2 weeks ago, got a call that the network has come down to a crawl, thought odd, people couldn't ping by name, or by ip sometimes and s...