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Originally Posted by Paul M
Unless I missed the point of his post, he was suggesting a way to change ip address, not get the same one (as per the title of this topic). Doing a release/renew will not get you a new ip on ntl - you will pickup the same ip again. Also, the leases in Nottingham are 2 days, not 4 hours, I don't know if this is the same elsewhere. 
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My point is that I don't see how his method is any different to releasing/renewing. It's been a while since I studyed DHCP, and I only have experience as a consumer of NTLs systems (so, no admin experience on their systems), so I could be wrong, but surely if your machine requests an IP within four hours (or whatever the lease time is) of being assigned the original IP, it will get the same IP? AFAIK, this will happen regardless of what you do before you renew the IP.
I do realise the point of his (or her) post is to suggest a way to change the IP, but don't understand how the method given is any more likely to work than releasing/renewing the IP.