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[IPFIX] Some comments on draft-ietf-opsawg-ipfix-tcpo-v6eh

"Eric Vyncke (evyncke)" <evyncke@cisco.com> Fri, 06 October 2023 12:49 UTC

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From: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
To: "opsawg@ietf.org" <opsawg@ietf.org>
CC: "ipfix@ietf.org" <ipfix@ietf.org>
Thread-Topic: Some comments on draft-ietf-opsawg-ipfix-tcpo-v6eh
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Date: Fri, 06 Oct 2023 12:49:00 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/ipfix/el3CnFAob3RBzWyvUkc53YTKBsM>
Subject: [IPFIX] Some comments on draft-ietf-opsawg-ipfix-tcpo-v6eh
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Benoît and Med,

Thanks for this useful document, please find below some comments (obviously without any hat).

Should the “No Next-Header” (next-header=59) be included (cfr my other remarks on the companion I-D) ?

There should be a way to convey the information that the exporter was (un)able to parse the *full* extension header chain due to HW limitation. This could be done by adding a bit/counter “KNOWN” (the opposite of UNKNOWN in the sense of a known layer-4 header).

About having counters per extension header how is “This Information Element echoes the order and number of occurrences” to be interpreted for the following flow?

HBH-RH-DST
HBH-DST-RH-FRA0-DST
HBH-DST-RH-FRA1-...
RH-DST

Will it be a single IE with HBH=3, DST=5, RH=3, FRA0=1, FRA1=1 or 4 IE exported (one for each chain) ?

I think that the 4 IE sounds more logical and useful, then there is no need to count the occurrences of one specific EH but more how often a specific EH chain was seen.

I still wonder why the tcpOptions and ipv6ExtensionHeaders are in the same I-D though ;-)

Hope this helps,

-éric

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