Hajo, I have the same prob. as you w/ the last hop.
mdf1-bi8k-2eth-2-6-dal1.attens.net (63.241.192.196)
not quite the same as yours, but basically the same.
I was on the phone w/ ATT the other week, and I had them look @ that hop for me, and they said there was deff. some problems on it, and would shoot it up to ther Eng. to look @.
Skuzzy, I have packet loss on ALL THe ATT Dallas hops. Any way for you to raise cain w/ ATT and get them to actually DO something about this?