New T1, limited connectivity/major slowness

[Tekmazter]

I've just added a 2nd T1 to my office location which is wireless based @ 10Mb. My setup is pretty standard:

(Internet) -- Router -- Firewall -- Router -- LAN

I can ping any host that is pingable on the internet with more than reasonable response times. However, when I attempt to hit many sites (Tek-Tips is one of them), either they eventually time out or take upwards of 10 minutes to load. After loads of testing and proving out all routes, DNS settings, and hop times, I decided to call my ISP.

They told that I should ask my DNS provider to put in a reverse zone for DNS.

Is this common? Has anyone ever done this and how should I explain it to my DNS provider?

 

[Tekmazter]

Realizing what a reverse DNS zone is, I don't see how this will help me. In any event, I thought it important to ask just in case I'm missing something here.