Parliament Hill Computers Ltd
IPv6 Background
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Background
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Why IPv6 is needed & high level overviews
Summary: we have run out of IPv4 addresses
Wikipedia on IPv6
well written, but a bit technical for many
IPv6 addressing
An oldish (2007) write up from Ars Technica
IPv6 Resource Center
at British Telecom
Free Pool of IPv4 Address Space Depleted