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how do you connect to the wan? is it with a router like people are suggesting? or are you using a usb modem?

if you are using a router and windows xp

go to control panel,
right click on the ethernet or wireless connection you want to set,
click properties,
select tcp/ip,
click on properties
check obtain ip address automatically
check obtain dns serevr automatically
click ok
click close

open a browser,
type in 192.168.0.1 to access your router
make sure you've set your ppoe username and password correctly

go back to the control panel
select internet options,
select the tab connections
click on setup
select connect to the internet,
select configure my connection manually,
select connect using a broadband connection that is always on,