Paul Vixie wrote:

Nobody in their right mind would sell T1 to every customer and do 1000:1 overcommit of their transit links without some kind of bandwidth shaping.

Well, i strongly doubt anyone would need to do that. Right now, there's enough long-haul fiber capacity in US to provide _all_ current Internet customers with full T-1s. Some carriers (Qwest for example) are already in terabit range in terms of raw capacity. Switching capacity is an entirely different beast :) Caching is not a panacea; it is not going to reduce traffic by even an order of magnitude. Simply put, the diversity is way too high. A year worth of Internet growth... I would rather think of cacheing as means to reduce load on very popular servers, not as something crucial to fixing backbone capacity problems. --vadim