Sorry Shannon, that is what I was recommending, but no exprience with Cisco, I'd personally still think that should work, hopefully we'll get more helpers in on this.
Just wonedring, perhaps the DNS Caches need flushing!?
How to Flush DNS in Mac OSX using Terminal...
In Mac OSX Leopard, you can use the command dnscacheutil -flushcache to flush the DNS resolver cache:
In Mac OSX versions 10.5.1 and before, the command lookupd -flushcache performed the same task: