Re: [Last-Call] [v6ops] Tsvart last call review of draft-ietf-v6ops-ipv6-ehs-packet-drops-05
Tom Herbert <tom@herbertland.com> Tue, 09 March 2021 22:07 UTC
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References: <161366727749.10107.14514005068158901089@ietfa.amsl.com> <42668fb5-a355-e656-7d99-c40b3d33fb92@si6networks.com> <0e377231-c319-2157-30a0-759e2f96a692@gmail.com> <5f464f17-85ed-f105-35f9-02f35d04aed2@si6networks.com> <CALx6S364zGbq_HZNNVEaJHnHccuk4Zau2DXhmaVYbwnYQc-5bw@mail.gmail.com> <1847e8e3-543f-5deb-dd14-f7c7fa3677db@si6networks.com> <CALx6S34TPppMRJrOvyJ05LLeRvv+S51pQHJnzZDKk-qOdsF0AA@mail.gmail.com> <e41f3484-f816-e185-2d99-94323c8da732@si6networks.com> <CALx6S34qSxGijVcs229bAL5gMhMvMNYUXm3yEmrg6wxUiUAiaA@mail.gmail.com> <bf83d228-25bc-21bb-f984-d58ead6bf492@si6networks.com> <CALx6S35Kh-QAXJDAucuw5Wty37MBiwS=pqQknMZ+15b7D5Sn8A@mail.gmail.com> <34e78618-cb28-71a1-a9d3-7aec38032659@si6networks.com> <CAO42Z2zqD9_d2Fbr25Y2CV1GdzYKd167yf5DHeHna7V66pF65A@mail.gmail.com> <0bd316ac-1789-f4c6-d280-943ad6e60309@si6networks.com> <CALx6S34dMEEJ+OPUu_=FW1Y5AQuvAaHzBPEe448S7rfbMmHN_w@mail.gmail.com> <CEFDF511-9255-4913-840D-50CCBC2B7B17@gmail.com>
In-Reply-To: <CEFDF511-9255-4913-840D-50CCBC2B7B17@gmail.com>
From: Tom Herbert <tom@herbertland.com>
Date: Tue, 09 Mar 2021 15:07:22 -0700
Message-ID: <CALx6S36_w+zxyUt0DzQ9NKBs+SAPZDNhs_sqLBwi+qneOPSS5A@mail.gmail.com>
To: Fred Baker <fredbaker.ietf@gmail.com>
Cc: Fernando Gont <fgont@si6networks.com>, Mark Smith <markzzzsmith@gmail.com>, Gorry Fairhurst <gorry@erg.abdn.ac.uk>, IPv6 Operations <v6ops@ietf.org>, draft-ietf-v6ops-ipv6-ehs-packet-drops.all@ietf.org, last-call@ietf.org, tsv-art@ietf.org
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Subject: Re: [Last-Call] [v6ops] Tsvart last call review of draft-ietf-v6ops-ipv6-ehs-packet-drops-05
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On Tue, Mar 9, 2021 at 6:07 AM Fred Baker <fredbaker.ietf@gmail.com> wrote: > > > > > On Feb 24, 2021, at 9:01 AM, Tom Herbert <tom@herbertland.com> wrote: > > > > The problems have been caused by some > > routers implementations that have assumed unwritten requirements (like > > routers must access transport layer), > > For the record, I don't know that this is a "router implementation" issue as much as it is an "operator requirement" interacting with the design of IPv4/IPv6 and UDP/TCP/ICMP. The protocol number, which operators filter on in ACLs, is carried in the transport layer headers. Fred, Yes, ACLs on transport layer ports are common requirements, however the problem arises from related requirements that arise due to the limitations of routers to be able to locate the transport layer information in a packet. An example of such an implied requirement from this draft is "don't send packets with IPv6 header chains that are too long because some routers can't parse deep enough into packets to find the transport layer ports due to implementation constraints (like limited size parsing buffer)". While the rationale for the requirement may make sense, the problem, at least from the host stack perspective of trying to send packets with low probability they'll be dropped, is that a requirement that "don't IPv6 header chains that are too long" is is useless without any quantification as exactly to what "too long" might be. Tom
- [Last-Call] Tsvart last call review of draft-ietf… Gorry Fairhurst via Datatracker
- Re: [Last-Call] Tsvart last call review of draft-… Fernando Gont
- Re: [Last-Call] Tsvart last call review of draft-… Brian E Carpenter
- Re: [Last-Call] Tsvart last call review of draft-… Fernando Gont
- Re: [Last-Call] [Tsv-art] Tsvart last call review… Gorry Fairhurst
- Re: [Last-Call] Tsvart last call review of draft-… Brian E Carpenter
- Re: [Last-Call] [v6ops] Tsvart last call review o… Tom Herbert
- Re: [Last-Call] Tsvart last call review of draft-… Fernando Gont
- Re: [Last-Call] [v6ops] Tsvart last call review o… Fernando Gont
- Re: [Last-Call] [Tsv-art] Tsvart last call review… Fernando Gont
- Re: [Last-Call] Tsvart last call review of draft-… Nick Hilliard
- Re: [Last-Call] Tsvart last call review of draft-… Gorry Fairhurst
- Re: [Last-Call] [v6ops] Tsvart last call review o… Tom Herbert
- Re: [Last-Call] [v6ops] Tsvart last call review o… Nick Hilliard
- Re: [Last-Call] Tsvart last call review of draft-… Nick Hilliard
- Re: [Last-Call] [v6ops] Tsvart last call review o… Tom Herbert
- Re: [Last-Call] [v6ops] Tsvart last call review o… Nick Hilliard
- Re: [Last-Call] [v6ops] Tsvart last call review o… Fernando Gont
- Re: [Last-Call] [v6ops] Tsvart last call review o… Tom Herbert
- Re: [Last-Call] [v6ops] Tsvart last call review o… Nick Hilliard
- Re: [Last-Call] [v6ops] Tsvart last call review o… Tom Herbert
- Re: [Last-Call] [v6ops] Tsvart last call review o… Fernando Gont
- Re: [Last-Call] [v6ops] Tsvart last call review o… Fernando Gont
- Re: [Last-Call] [v6ops] Tsvart last call review o… Nick Hilliard
- Re: [Last-Call] [v6ops] Tsvart last call review o… Tom Herbert
- Re: [Last-Call] [v6ops] Tsvart last call review o… Fred Baker
- Re: [Last-Call] [v6ops] Tsvart last call review o… Nick Hilliard
- Re: [Last-Call] [v6ops] Tsvart last call review o… Tom Herbert
- Re: [Last-Call] [v6ops] Tsvart last call review o… Fernando Gont
- Re: [Last-Call] [v6ops] Tsvart last call review o… Mark Smith
- Re: [Last-Call] [v6ops] Tsvart last call review o… Joseph Touch
- Re: [Last-Call] [v6ops] Tsvart last call review o… Fernando Gont
- Re: [Last-Call] [v6ops] Tsvart last call review o… Tom Herbert
- Re: [Last-Call] [v6ops] Tsvart last call review o… Fernando Gont
- Re: [Last-Call] [v6ops] Tsvart last call review o… Joseph Touch
- Re: [Last-Call] [v6ops] Tsvart last call review o… Mark Smith
- Re: [Last-Call] [v6ops] Tsvart last call review o… Fred Baker
- Re: [Last-Call] [v6ops] Tsvart last call review o… Tom Herbert
- Re: [Last-Call] [v6ops] Tsvart last call review o… Fernando Gont
- Re: [Last-Call] [v6ops] Tsvart last call review o… Tom Herbert
- Re: [Last-Call] [v6ops] Tsvart last call review o… Rob Wilton (rwilton)
- Re: [Last-Call] [v6ops] Tsvart last call review o… Nick Hilliard
- Re: [Last-Call] [v6ops] Tsvart last call review o… Tom Herbert
- Re: [Last-Call] [v6ops] Tsvart last call review o… Brian E Carpenter
- Re: [Last-Call] [v6ops] Tsvart last call review o… Fernando Gont
- Re: [Last-Call] [v6ops] Tsvart last call review o… Fernando Gont
- Re: [Last-Call] [v6ops] Tsvart last call review o… Tom Herbert
- Re: [Last-Call] [v6ops] Tsvart last call review o… Tom Herbert
- Re: [Last-Call] [v6ops] Tsvart last call review o… Fernando Gont
- Re: [Last-Call] [v6ops] Tsvart last call review o… Tom Herbert
- Re: [Last-Call] [v6ops] Tsvart last call review o… Tom Herbert
- Re: [Last-Call] [v6ops] Tsvart last call review o… Fernando Gont
- Re: [Last-Call] [v6ops] Tsvart last call review o… Rob Wilton (rwilton)
- Re: [Last-Call] [v6ops] Tsvart last call review o… Tom Herbert
- Re: [Last-Call] [v6ops] Tsvart last call review o… Timothy J. Salo
- Re: [Last-Call] [v6ops] Tsvart last call review o… Tom Herbert
- Re: [Last-Call] [v6ops] Tsvart last call review o… Brian E Carpenter
- Re: [Last-Call] [v6ops] Tsvart last call review o… Fernando Gont