Probable you played with so called network traffic optimizers applations that usually modify the MTU size. You should try the following (long) procedure in order to set a workable MTU value.
Q314825 -"How to Troubleshoot Black Hole Router Issues"
Trying to unweave, unwind, unravel
And piece together the past and the future,
T. S. Eliot
When I run a tracert, either out of the Command Prompt or using TJping, it will time out on all of the hops showing me no info, but will show me the destination IP on the final hop, regardless of what site I trace.
Pings fine, lookup works fine.
I have TrendMicro PC-Cillin installed. I have tried it with PC-Cillin off, XP firewall off, everything on,everything off.... I have 3 boxes all through a Linksys 4port cable router, broadband connection.
I have tried it with the XP box directly connected to the cable, a different modem, and resetting the router.
Also, one box running WIN98SE going through the router does a tracert fine.
A setting I am missing in XP?