Re: [bmwg] An improved version of our I-D: draft-lencse-bmwg-benchmarking-stateful-02

"MORTON JR., AL" <acmorton@att.com> Sat, 06 November 2021 20:11 UTC

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From: "MORTON JR., AL" <acmorton@att.com>
To: Gábor LENCSE <lencse@hit.bme.hu>, "bmwg@ietf.org" <bmwg@ietf.org>
Thread-Topic: [bmwg] An improved version of our I-D: draft-lencse-bmwg-benchmarking-stateful-02
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Date: Sat, 06 Nov 2021 20:10:11 +0000
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Subject: Re: [bmwg] An improved version of our I-D: draft-lencse-bmwg-benchmarking-stateful-02
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Hi Gábor,

Thanks for your recent updates to the “stateful” GW benchmarking draft, and for sharing your test results with BMWG and v6OPS mailing lists.

I have a few comments, as a participant, and we can discuss during the IETF-112 session:

Sec4.2
It seems that the preliminary test phase establishes the size of the state table in the DUT.
Q: (note to check – is the state table capacity mentioned as a benchmark, later in the memo?
    No, it is not.  Then)
Q: Is the state table capacity measurable? It seems useful to know during testing, at least.

Also:
   *  The connections do not time out in the DUT even during the
      beginning of the real test phase.
comment: this time-out might be a parameter to configure, or to know and ensure that the time between test phases does not exceed. It’s expressed as a statement of fact above, but it’s really a requirement (to configure) for testing.

Sec4.3
   *  setting the UDP timeout of the NATxy gateway to a value higher
      than the length of the preliminary phase.
It seems that this is the minimum timeout, and is only safe if traffic on the first connection established during the preliminary phase appears immediately when the “real” test phase begins.
The “safer” specification of the UDP timeout seems to be:
   *  setting the UDP timeout of the NATxy gateway to a value higher
      than the length of the preliminary phase and the real phase combined.

(I don’t think Sec4.7 offers the above as a solution, just cautions and the loss problem.)

regards,
Al
(as a participant)


From: bmwg <bmwg-bounces@ietf.org> On Behalf Of Gábor LENCSE
Sent: Sunday, October 10, 2021 2:11 PM
To: bmwg@ietf.org
Subject: [bmwg] An improved version of our I-D: draft-lencse-bmwg-benchmarking-stateful-02

Dear BMWG List Members,

We have gained some practical experience with the methodology for stateful NATxy gateways by measuring the scale-up of iptables. There were two similar measurement series:

1. Examining how the performance of iptables scales up with the number of CPU cores. The results are available from: https://mailarchive.ietf.org/arch/msg/v6ops/zwJJGAFG3BRtuO74IyoocP6kAL0/<https://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/v6ops/zwJJGAFG3BRtuO74IyoocP6kAL0/__;!!BhdT!wvq0sF1VVXjuutBemxKTAyWCl84R9cyNEELJaFNwuzJRHPb85vsR6UacMMsa$>

2. Examining how the performance of iptables scales (degrades) with very high number of connections (up to 800 million). The results are available from: https://mailarchive.ietf.org/arch/msg/v6ops/axKSI8hnEbQPzPZGxPoS7KaLmXM/<https://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/v6ops/axKSI8hnEbQPzPZGxPoS7KaLmXM/__;!!BhdT!wvq0sF1VVXjuutBemxKTAyWCl84R9cyNEELJaFNwuzJRHPb85vsR6Vvz4x9u$>

Based on the experience of the about tests, we have refined the methodology. The novel thing is how to ensure repeatable results by the proper setting of the timeout values. Now we can guarantee that the connection tracking table of the DUT always contains the required number of elements, if its size is large enough and no connection tear down happens due to timeout during the measurements.

Section 4.3 was completely rewritten, and Section 4.4 was also adjusted as needed. Please see the details here: https://www.ietf.org/rfcdiff?url2=draft-lencse-bmwg-benchmarking-stateful-02<https://urldefense.com/v3/__https:/www.ietf.org/rfcdiff?url2=draft-lencse-bmwg-benchmarking-stateful-02__;!!BhdT!wvq0sF1VVXjuutBemxKTAyWCl84R9cyNEELJaFNwuzJRHPb85vsR6bwkaC-q$>

We welcome all comments!

Best regards,

Gábor


-------- Továbbított üzenet --------
Tárgy:
New Version Notification for draft-lencse-bmwg-benchmarking-stateful-02.txt
Dátum:
Sun, 10 Oct 2021 09:20:10 -0700
Feladó:
internet-drafts@ietf.org<mailto:internet-drafts@ietf.org>
Címzett:
Gabor Lencse <lencse@sze.hu><mailto:lencse@sze.hu>, Keiichi Shima <keiichi@iijlab.net><mailto:keiichi@iijlab.net>



A new version of I-D, draft-lencse-bmwg-benchmarking-stateful-02.txt
has been successfully submitted by Gabor Lencse and posted to the
IETF repository.

Name: draft-lencse-bmwg-benchmarking-stateful
Revision: 02
Title: Benchmarking Methodology for Stateful NATxy Gateways using RFC 4814 Pseudorandom Port Numbers
Document date: 2021-10-10
Group: Individual Submission
Pages: 15
URL: https://www.ietf.org/archive/id/draft-lencse-bmwg-benchmarking-stateful-02.txt<https://urldefense.com/v3/__https:/www.ietf.org/archive/id/draft-lencse-bmwg-benchmarking-stateful-02.txt__;!!BhdT!wvq0sF1VVXjuutBemxKTAyWCl84R9cyNEELJaFNwuzJRHPb85vsR6U32CwIs$>
Status: https://datatracker.ietf.org/doc/draft-lencse-bmwg-benchmarking-stateful/<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-lencse-bmwg-benchmarking-stateful/__;!!BhdT!wvq0sF1VVXjuutBemxKTAyWCl84R9cyNEELJaFNwuzJRHPb85vsR6ak4IPmN$>
Htmlized: https://datatracker.ietf.org/doc/html/draft-lencse-bmwg-benchmarking-stateful<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/html/draft-lencse-bmwg-benchmarking-stateful__;!!BhdT!wvq0sF1VVXjuutBemxKTAyWCl84R9cyNEELJaFNwuzJRHPb85vsR6d5lG967$>
Diff: https://www.ietf.org/rfcdiff?url2=draft-lencse-bmwg-benchmarking-stateful-02<https://urldefense.com/v3/__https:/www.ietf.org/rfcdiff?url2=draft-lencse-bmwg-benchmarking-stateful-02__;!!BhdT!wvq0sF1VVXjuutBemxKTAyWCl84R9cyNEELJaFNwuzJRHPb85vsR6bwkaC-q$>

Abstract:
RFC 2544 has defined a benchmarking methodology for network
interconnect devices. RFC 5180 addressed IPv6 specificities and it
also provided a technology update, but excluded IPv6 transition
technologies. RFC 8219 addressed IPv6 transition technologies,
including stateful NAT64. However, none of them discussed how to
apply RFC 4814 pseudorandom port numbers to any stateful NAT (NAT44,
NAT64, NAT66) technologies. We discuss why using pseudorandom port
numbers with stateful NAT gateways is a hard problem and recommend a
solution.



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