Re: Smallest Transit MTU

[Dan Hollis <goemon () anime net>]

On Thu, 30 Dec 2004, Florian Weimer wrote:
> * Dan Hollis:
> > Because tcp connection endpoints have to implement ECN in order to manage 
> > the flow.
> Your wording suggests that ECN is purely an end-to-end signaling
> protocol

it does? where?

> (and so does a lot of propaganda from the ECN zealots).

an "ecn zealot" is someone who wants firewalls to work correctly? someone 
who wants idiots to stop blocking all icmp a  "pmtud zealot"?

> But is this really true?  If I read the RFC correctly, you need *routers*
> that use ECN to indicate congestion instead of packet drops.

anything along the path can *indicate* congestion, but its up to the 
*endpoints* to *respond* to the ECN indication and mitigate their flows.

read rfc3168 paying close attention to 6.1.2 and 6.1.3

-Dan