[Pana] NAT issue

[Yoshihiro Ohba <yohba at tari.toshiba.com>]

In the current draft:

"
   When the PANA message is sent in response to a request, the UDP
   source and destination ports of the response message MUST be copied
   from the destination and source ports of the request message,
   respectively.

   For other PANA messages, the source port MUST be set to a value
   chosen by the sender and the destination port MUST be set to the
   assigned PANA port (To Be Assigned by IANA).
"

According to this, a PAA-originated request will be always sent to
PANA port.  If there is a NAT between PaC and PAA, this does not seem
to work, because the NAT is typically expecting incoming messages to
be received on the port that was used as the source port of outgoing
messages.

Yoshihiro Ohba


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