Re: I-D Action: draft-rosenberg-internet-wait-hourglass-00.txt

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Lars Eggert said:

"A big driver for SCTP was for use a signaling protocol. Other SDOs are  
using SCTP for signaling in their network architectures, and are also  
now introducing NAT functionality at controlled places in these  
architectures. This is why I believe and have argued that an IETF BCP  
that documents how to correctly NAT SCTP is the right thing to  
produce. (And, FWIW, DCCP. There's some interest in that as well, but  
not such an immediate one as for SCTP.) As a SIP-area person, this  
mode of operation should be familiar to you.

Will this BCP make SCTP available behind a home NAT? Nope. But it  
provides a specification that people can refer to who design network  
architectures that are more tightly controlled than the end user  
Internet, i.e., where people can define and then require their NATs to  
have this functionality."

I agree with Lars here -- having a specification is the first step.
However, I would suspect that clearly specifying how SCTP and DCCP 
work with NAT would eventually make it possible to obtain a home NAT 
supporting those protocols, particularly if implementations were made 
available within the popular distributions (e.g. DD-WRT) on which those 
home NATs are frequently based. 

On another note, I think it makes a difference whether UDP/TCP is combined 
with IP at the waist, or whether UDP/TCP is considered a lower layer on 
which IP, etc. can run.  That is, whether we have general NAT traversal 
mechanisms which support a wide array of applications, or whether we end 
up having to modify each individual protocol.  The draft seems to suggest 
the latter approach.  I disagree. 
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