[e2e] What's wrong with this picture?

[rick jones]

On Sep 6, 2009, at 6:00 PM, David P. Reed wrote:

> For those who have some idea of how TCP does congestion control, I  
> ask "what's wrong with this picture?"
> And perhaps those who know someone responsible at the Internet  
> Access Provider involved, perhaps we could organize some consulting  
> help...
>
> (Hint: the problem relates to a question, "why are there no lost IP  
> datagrams?", and a second hint is that the ping time this morning  
> was about 193 milliseconds.)

Perhaps the IAP in question believes that all ICMP traffic is equal,  
but some is more equal than others, with destination unreachable  
having rather higher priority than echo?

rick jones
http://homepage.mac.com/perfgeek