Re: [IPFIX] NetFlow v9 to IPFIX conversion

Petr,

You should write an RFC (well, start with a draft) which explains the 
proposal and requests the PEN from IANA.

Since the IPFIX WG is now closed, such a draft must be AD sponsored by Joel.

P.


On 26/03/15 07:14, Petr Velan wrote:
> Hi Andrew, all,
>
> thank you for your explanation regarding nprobe.
>
> However, we also need a fallback for unknown exporters with IEs > 
> 2^15. The generic requests for PENs need organization name, contact 
> name and email address. I can try to request the PEN for NetFlow v9 
> compatibility myself, but I'd like it to be more public. Therefore, I 
> suggest to complete the request with something like:
> *Organization Name*: NetFlow v9 to IPFIX
> *Contact Name*: IPFIX WG
> *Contact E-Mail: *[email protected] <mailto:[email protected]>
>
> This is just a first proposal to get things moving, please add your 
> thoughts. Once the PEN is granted, we can move forward and explain its 
> purpose in a short RFC.
>
> Petr
>
> On Tue, Jan 6, 2015 at 9:07 PM, Andrew Feren <[email protected] 
> <mailto:[email protected]>> wrote:
>
>     Hi Petr,
>
>     On 01/06/2015 07:03 AM, Petr Velan wrote:
>>     Hello all,
>>
>>     I'm not sure whether this is the right place to ask, but we
>>     encountered following problem when converting NetFlow v9 messages
>>     to IPFIX.
>>
>>     Some vendors (I've heard of ntop) are using elements IDs large
>>     than 32767 in NetFlow v9. When converting messages with these
>>     elements to IPFIX, they are considered to be Enterprise Numbers.
>>     To generate proper IPFIX message, we need to do one of the following:
>>     a) Generate a list of the elements and map them to PEN of the
>>     correct vendor. However, this would result in an attempt to cover
>>     all possible elements that anybody used in NetFlow v9. Moreover,
>>     we would still have to somehow handle the cases where the element
>>     is unknown
>     This should help with ntop/nprobe
>
>     Recent versions of nprobe (since version 5.5.5 I think) all use
>     the following mapping.
>
>     PEN = 35632 and IPFIXID = (v9ID - 57472)
>
>     For example, one v9 IE that nprobe exports is MYSQL_SERVER_VERSION
>     57667.  The IPFIX equivalent would be
>     MYSQL_SERVER_VERSION(35632/195).
>
>     The nprobe docs have a complete list.
>
>     Older versions of nprobe (pre ~2010) use IEs not in RFC 3954, but
>     later allocated in IANA.  There is no good way to convert those v9
>     exports to IPFIX.
>
>     -Andrew
>
>
>>     b) Request a PEN for NetFlow compatibility and just add this PEN
>>     for every element that has ID larger than 32767.
>>
>>     Personally, I believe that the b) is more general and
>>     error-prone. Do you think, that it would be possible to dedicate
>>     whole PEN to this cause?
>>
>>     Thank you for any opinions,
>>
>>     Petr Velan
>>
>>
>>
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>
>

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