Re: transmech MTU comments

[Pekka Savola <pekkas@netcore.fi>]

On Wed, 12 Nov 2003, Fred Templin wrote:
> My understanding of RFC 3168 is that when the tunnel interface
> forwards an IPv6 packet to an IPv4 interface with an ECT(0) or ECT(1)
> codepoint in the traffic class field, it MAY set the codepoint to CE if
> congestion is experienced. I interpret the MAY to mean that the other
> option is to drop the packet. If the packet is to be dropped, should it
> be dropped silently? Also, could a link restriction be considered as
> congestion? If so, does drop silent also entail NOT sending an
> ICMPv6 "packet too big" message back to the source?

Where in the spec do you read that the MAY?   What I basically read is 
9.1.1, first paragraph, a couple of the last sentences.  But that applies 
to the decapsulating router only.

RFC3168 doesn't seem to define how to drop the packet, by the way, so I 
assume by "dropping" they mean a silent discard.

I'm not sure whether it makes sense to delve into ECN details in the 
spec..

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings