ECN

Simon Kirby
2001-01-26T17:06:22Z

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-

[ Stormix Technologies Inc. ][ NetNation Communications Inc. ]
[ sim@stormix.com ][ sim@netnation.com ]
[ Opinions expressed are not necessarily those of my employers. ]