Re: [Pana] PANA-Error-Request

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

Alper,

Since sequence numbers used for requests generated by PaC and
generated by PAA are independent, it is possible that the sequence
numbers contained in two consecutive messages sent by the same entity
can be the same.  

For example, if the PaC sends a PAN (without EAP-Payload) in response
to a PAR generated by the PAA and then sends a PAR (with EAP-Payload),
then the PAN contains the sequence number assigned by the PAA and
contained in a PAA-generated PAR while the PaC-generated PAR contains
the sequence number assigned by the PaC, the two sequence numbers can
happen to be the same (perhaps with a very low probability).  As a
result, when a PER for one of those messages are generated by the PAA,
the PaC will not able to determine which message caused an error.

So I think Sequence Number is not sufficient to determine the message
that caused the error.

Yoshihiro Ohba


On Fri, Oct 27, 2006 at 01:44:05PM +0300, Alper Yegin wrote:
> >    The Algorithm AVP (AVP Code X) is of type Unsigned64 containing
> >    Flags, Message Type and Sequence Number fields of the header of the
> >    message that caused the error.  The AVP Data field is encoded as
> >    follows:
> > 
> >     0                   1                   2                   3
> >     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
> >    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >    |            Flags              |         Message Type          |
> >    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >    |                      Sequence Number                          |
> >    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> > "
> 
> Actually, why not simply carry the sequence number only. This is sufficient
> to identify a unique message within a PANA session.
> 
> Alper
> 
> 
> 
> 
> > 
> > Yoshihiro Ohba
> > 
> > _______________________________________________
> > Pana mailing list
> > Pana at ietf.org
> > https://www1.ietf.org/mailman/listinfo/pana
> 
> 

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