I have three computers, one running linux, one dual boots linux and
Wndows XP, the the third only runs XP. The windows computer has very
poor performance an all networks, including the dial-up connections
and 100Mbit ethernet. The USR 56k modials and connects fine, but once
connected, it usually will not resolve hostnames on the first try and
will connect to the site after several tries. I tried changing DNS
servers with no change in the performance. Once connected to the
website, downloading starts and stops every few seconds. Sometimes
the connection times out, and often I end up with no activity and a
blank screen in my browser, most often after clicking on a google
search result. I tried the same dial-up connection from Windows on
the dual-boot computer and it works fine. The ethernet connection to
this computer seems to have the same problem. The connection is slow
and intermittent. The other two can communicate at near full speed
with no problem. All three are connected to a switch with 100Mbit
ethernet. I had ICS on the XP computer and the others configured by
DHCP.

Can anyone help me diagnose this problem?