*blush*

I solved my own question!

> I found that the Kerberos mechanism for GSS-API includes a sequence number 
> that is incremented with each wrapped or MIC’d message.  I assume that the 
> receiving side would verify that sequence number, and drop any thing too old, 
> and perhaps also anything too new.  This would mean that Kerberos over 
> GSS-API enforces a strict ordering, and is thus too limiting to use with 
> SCTP.  Am I correct?  I found a GSS_C_SEQUENCE_FLAG, but it is not documented 
> in RFC 4121 that mentions it :-S

I found GSS_C_SEQUENCE_FLAG defined in RFC 1509, as a general flag for GSS-API 
mechanisms.  And, there is an alternative flag GSS_C_REPLAY_FLAG that is also 
available in the Kerberos mapping of GSS-API.  So the answer appears to be 
“yes, you can do this with Kerberos”.

I’m going to assume that MIT krb5 will indeed implement these.

-Rick
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