ECN

[Simon Kirby]

On Fri, Jan 26, 2001 at 07:14:42AM -0800, David S. Miller wrote:

> Jamie Lokier writes:
>  > Does ECN provide perceived benefits to the node using it?
> 
> Yes, endpoints and intermediate routers can tell the TCP sender about
> congestion instead of TCP having to guess about it based upon observed
> packet drop.
> 
> It is a major enhancement to performance over any WAN.
> 
> The endpoint based congestion notification happens _now_ if both
> sides speak ECN.  The router based notification will be happening
> in the near future as Cisco and others deploy ECN speaking versions of
> their router software.

Hmm... Just wondering: what does TCP then do when it receives this ECN
notification?  Try harder, try less?  Or does it get a specific packet
saying "I dropped your packet", and then the sender retransmits?

I suppose I could go find the RFC...

Simon-

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