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Re: PSAMP: ipHeaderPacketSection and mplsLabelStackSection



Paul,

Fine for me. I did not realize that the specification for
ipPayloadPacketSection changed since -03.

Regards,
Gerhard


Paul Aitken wrote:
> Gerhard,
> 
>> I think Paul's concerns are important.
>>
>> Example:
>> The standard IP header is 20 bytes long, but may be longer with options.
>> You use a template with ipHeaderPacketSection and length 40 and want to
>> export an IP packet that has a standard header only. There is payload
>> which is indicated by the total length in the IP header.
>> If the monitor now "blanks" the IP payload, your collector does not know
>> if the payload originally was blank or not. The capability to decode the
>> IP header information does not help.
> 
> Blanking the payload is not allowed. See my reply to Thomas.
> 
> Instead, the application would have been configured to only export
> header information (no payload info), so it would have to create a new
> template either with the necessary fixed length, or with a variable length.
> 
> 
>> As a third solution, variable length IEs could be used (see
>> draft-ietf-ipfix-protocol).
> 
> This is allowed by solution (2).
> 

-- 
Dipl.-Ing. Gerhard Münz
Computer Networks and Internet
Wilhelm Schickard Institute for Computer Science
University of Tuebingen
Auf der Morgenstelle 10C 9P16, D-72076 Tuebingen, Germany
Phone: +49 7071 29-70534 / Fax: +49 7071 29-5220
EMail: muenz@informatik.uni-tuebingen.de
WWW:   http://net.informatik.uni-tuebingen.de/~muenz

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