VEERY slow internet responses -- me or the net?

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http://www.linuxquestions.org – Hello, Several days ago responses to many, but not all, of my internet requests slowed from long to never. I'm on Verizon FIOS; running Firefox on a Debian Lenny system with 6GB or RAM and 500GB HD with 32GB cache. internettrafficreport.com shows index of 84 for North America. I've pinged a few sites -- see returns from 16ms to 91ms. I've also rebooted my Verizon DSL router. Can anyone suggest diagnostics that can help me pin down the problem? Note my workstation stats below. Many thanks, L (HowTos)