[PANRG] Flow labels in draft-irtf-panrg-what-not-to-do-02
Tom Herbert <tom@herbertland.com> Mon, 01 April 2019 03:31 UTC
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From: Tom Herbert <tom@herbertland.com>
Date: Mon, 01 Apr 2019 05:31:13 +0200
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Subject: [PANRG] Flow labels in draft-irtf-panrg-what-not-to-do-02
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Hello, >From the draft wrt IPv6 flow label: "Before methods are widely deployed to use this method, there could be no incentive for an endpoint to set the field." At this point, the majority of IPv6 packets in the Internet should have properly set non-zero flow labels. Non-zero flow label is set by default for Linux since 2014. iOS was setting it before that, and I believe Windows started setting flow labels not long after Linux. This is one of the few things we were able to turn on in the Internet without causing any major problems and it has zero negative performance impact. The impetus is on network devices to start using the information. e.g. a tcpdump unconnected UDP from my Linux host: 20:12:06.099837 IP6 (flowlabel 0x1b95a, hlim 64, next-header Options (0) payload length: 56) 3333::1 > 1113:1:0:0:8000::: HBH (opt_type 0xde: len=20) 58669 > 7777: [udp sum ok] UDP, length 24 Tom