Help.. how do I clean out my network settings?

I'm having a big problem connecting to a particular network. It connects fine at home, but there seems to be something wrong at work. when I connect I get an IP address but then I'm not able to ping anything, not even the router. Of course nothing else network related works.
Is there someplace where I can completely wipe any preferences that OSX has?
I wonder if re-installing 10.3 will help clear out this problem?

Thanks I'll try that on another computer. Mine started working yesterday after I created a new location in the Network Preferences. I made a copy of the 'Automatic' location and the laptop started working OK (I was testing it by pinging it from another station). The Auto was set to configure via DHCP. If I switched back and forth between the original Automatic location and the new copy, it would take the same IP address but the pinging would not work in the original but it would work when the copy was active. Why is this happening?
On a side question, how do I find out which is the date and time for the release and renewal of the IP address when in DHCP? Kind of what you get with ipconfig /all on a win platform..
Thanks

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