[pcp] To change a mapping does the pcp source port need remain the same?

[[e-mail] (Eric W. Biederman)]

I have just been reading through draft-ietf-pcp-base-26.txt and figuring
out what it would take to implement.

In the normal non-authenticated case a pcp client will pick a randomized
source port and use that one port to create and refresh mappings.

Would it be an error for a pcp server to require pcp clients to use
the same source port that a mapping was established with to change
that mapping?

As a trivial way to keep different clients from stepping on each other
by accident I would certainly require the source port to remain constant
to change a mapping.

Eric