a few more specifics, 
both domains are static ip's, and are registered domains, 
shelbyvilledesign.com at 216.176.80.22 (sme 5.6 box)
fourstaraviation.com at 216.176.73.64   (sme 6.0 box)
tracert from shelbyvilledesign.com to fourstaraviation.com yields:
Tracing route to 
www.fourstaraviation.com [216.176.73.64]over a maximum of 30 hops: 
1    <1 ms    <1 ms    <1 ms  192.168.0.254
2    28 ms    28 ms    28 ms  216.176.80.254 (isp's g/w)
3     *        *        *     Request timed out.
so the sme 6.0 box at 216.176.73.64 is dropping packets into oblivion. Is there a ip 'blacklist'?
somewhere along the way the router part of the sme box has been told to ignore 216.176.80.22. Not being a linux weenie, what pkg is used for ip routing? what file are the routing tables in? 
erie