[NSIS] GIST over GIST-unaware NATs

Hi all,

There were some IESG discussions on GIST over GIST-unaware NATs.  I
read through draft-pashalidis-nsis-gist-legacynats-00 and found it makes
a number of clarifications on this issue:

- The presence of a GIST-unaware NAT can be detected by comparing 
headers of the GIST query-response procedure message in the two adjacent
non-NAT GIST nodes.

- Upon the detection of such a NAT (and affiliated rules), these two 
GIST nodes can then establish a UDP tunnel between them, and encapsulate 
the GIST messages (query-response-...) into the tunnel, and the outgoing 
tunnel endpoints decapsulate the messages into the desired format.

- The draft also gives detailed description on GIST signaling and data 
traffic processing in both the case where a NAT is located close to the 
NI and the case where a NAT is close to the NR. The rationale looks fine 
to me. If there is an implementation demoing this, it would be even nicer.

What do others think?
Xiaoming

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