[IPFIX] UDP Sequence Numbers rfc 5101

Please consider the wording of the paragraph on Sequence Numbers in Section
3.1.

      Incremental sequence counter modulo 2^32 of all IPFIX Data Records

      sent in the current stream from the current Observation Domain by

      the Exporting Process. Each SCTP Stream counts sequence numbers

      separately, while all messages in a TCP connection or UDP

      transport session are considered to be part of the same stream.

The phrase I have put in italics is depended on Transport protocol.

Section 10.3.2 Reliability says:

 

In the case of UDP, the IPFIX Sequence Number contains the

total number of IPFIX Data Records sent for the UDP Transport Session

prior to the receipt of this IPFIX Message

 

This is NOT dependent on the ObservationDomain.  Nothing prohibits the
Exporting Process from using the same Transport Session for multiple
Observation Domains.  But in UDP the Sequence number is for the Transport
session, whereas in TCP and SCTP each Observation Domain has an independent
sequence on the same  (and on each) Transport Session.

 

The term 'Stream' seems to take different meanings in IPFIX, depending on
the transport protocol.

This is not consistent with IPFIX being  "Transport protocol independent "
(Section 10 first para).

 

Regards

Steve Nash

[email protected]

UK

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