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Originally Posted by Matthew
Why do ntl use proxies, they are the only ISP that I know that does use them.
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There are others.
Many will argue that proxies are not needed, because upstream peer costs per byte are a lot less than they used to be. However, ntl has a large customer base, nearly 3m Internet subscribers (including Virgin and VISP operations), so peering costs are huge.
Love them or loath them, they are a cost effective way of reducing costs.