you should only need to run the install cd once when you first installed ntl.you can then remove all the ntl software if you want,its not required again,even if you reinstall the os.
my settings are as follows if it helps.
ip address 184.108.40.206
subnet mask 255.255.255.0
default gateway 220.127.116.11
dchp server 18.104.22.168
dns servers 22.214.171.124 / 126.96.36.199