I run an eyeballs/isp network for about ~50,000 subscribers, and I see about 
1:10 ratio at peak time.  Last night ~4.5 gbps out, ~45 gbps in.  But, I do 
have local caching of 4 big name cdn cache providers, so that might alter the 
1:10 ratio I see on my actual inet links (which do not include the local cdn 
traffic)

 

…take Netflix for instance… I see on my local nfx cdn links, 1:100 ratio of 
in:out.  20 gbps inbound and .2 gbps outbound  (during that same timeframe as 
aforementioned actual inet links)

 

Numbers based on 21:00 CDT last night.

 

 

-Aaron

 

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