The IETF has been doing extensive work on NAT traversal, have a look
and see if you can reuse some existing mechanism.
All mechanisms used with the possible exception of an additional SNMP
table will be re-used from existing IETF work (mostly SSH with help
from the fact that it's based on TCP).
Perhaps then it's time we consider mandating a "NAT-Traversal" section to
standards track documents much like IANA and Security considerations have
become common place to this day. Anything that's not covered by the BEHAVE
work already done should be covered there, as the IETF seems to have indeed
accepted the proliferation and widespread acceptance of NAT functionality.
-Tom
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