Re: RINA - scott whaps at the nanog hornets nest :-)

[Jack Bates <jbates () brightok net>]

On 11/6/2010 4:40 PM, sthaug () nethelp no wrote:
>  For some value of "works". There are way too many places filtering
>  ICMP for PMTUD to work consistently. PMTUD is *not* the solution,
>  unfortunately.

He was referring to the updated RFC 4821.

" In the absence of ICMP messages, the proper MTU is determined by starting
   with small packets and probing with successively larger packets.  The
   bulk of the algorithm is implemented above IP, in the transport layer
   (e.g., TCP) or other "Packetization Protocol" that is responsible for
   determining packet boundaries."

It is designed to support working without ICMP. It's draw back is the 
ramp time, which makes it useless for small transactions, but it can be 
argued that small transactions don't need larger MTUs.


Jack