Server 2k3 - Damn slow Internet

[mx2k]

Hi there,

i'm running WinServer 2003 and connect to my ISP through Routing & Remote Access, but the internet on clients, esp. dns, is goddamn slow! dns queries often timeout or are not forwarded. i'm not using DHCP allocator. Must i use it, as windows says?? any ideas why it could be so slow? (before i had an hardware-firewall which was dialing, but that one's fubar so i tried the windows service)

thx