William,

Thanks! Our ISP is Telecorp, a Venezuela satellite internet company but they just resell someone else's service. The earth station is in Colombia. They use the Gilat Skystar e360 modem. There's some weird stuff they're doing like http caching as we get stale pages from a number of sites unless we manually refresh. Our modem's IP is in the reserved range (10.29.x.x ) but our public IP (seen from your side) is 190.7.79.x. I suspect it's something funky the ISP is doing.
Greg