[e2e] TCP Loss Differentiation

Fred Baker fred at cisco.com
Mon Feb 23 15:10:53 PST 2009

On Feb 23, 2009, at 3:01 PM, Jon Crowcroft wrote:

> if each router were to record in every packet in a flow, all the  
> packets it had seen, the order it had seen them, and the routers own  
> address, then when any packet arrives, you'd have a cmplete history  
> of packets predeceessors and successors and gaps, and where gaps are  
> caused, and so a receiver can disambiguate on a _per packet_ base  
> when a loss was not congestive...

Great! I'm really excited to hear that every router has now sprouted a  
reason to add a few more gigahunks of memory, and that service  
providers are willing to pay the operational expense in heat and  
power! My product managers will be truly dumbfounded that they had not  
tumbled on that source of revenue in the past. And I'm sure that the  
ISPs will be all too eager to pass the upgrade cost along to their  

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