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Re: [Int-area] Kathleen Moriarty's Discuss on draft-ietf-intarea-gre-mtu-04: (with DISCUSS)

"Templin, Fred L" <Fred.L.Templin@boeing.com> Tue, 19 May 2015 21:07 UTC

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From: "Templin, Fred L" <Fred.L.Templin@boeing.com>
To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
Thread-Topic: Kathleen Moriarty's Discuss on draft-ietf-intarea-gre-mtu-04: (with DISCUSS)
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Date: Tue, 19 May 2015 21:07:07 +0000
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Cc: "draft-ietf-intarea-gre-mtu@ietf.org" <draft-ietf-intarea-gre-mtu@ietf.org>, "int-area@ietf.org" <int-area@ietf.org>, "draft-ietf-intarea-gre-mtu.ad@ietf.org" <draft-ietf-intarea-gre-mtu.ad@ietf.org>, "Ronald P. Bonica" <rbonica@juniper.net>, "draft-ietf-intarea-gre-mtu.shepherd@ietf.org" <draft-ietf-intarea-gre-mtu.shepherd@ietf.org>, Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>, The IESG <iesg@ietf.org>, "intarea-chairs@ietf.org" <intarea-chairs@ietf.org>
Subject: Re: [Int-area] Kathleen Moriarty's Discuss on draft-ietf-intarea-gre-mtu-04: (with DISCUSS)
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The draft is reliant on discovery of the GMTU, which is through PMTUD procedures.
That being the case, the draft needs to tell the conditions under which PMTUD can
be relied on. Reliable delivery of PTB messages is one necessary condition. Assurance
against source address spoofing is another.

Also, I have also said many times that probing with 1280 byte packets is insufficient
guidance when ECMP or LAG may send data packets along different paths than the
probe packets. Hence, "MUST" send probes is not useful guidance unless more is
said about the probing procedure and its interactions with multipath.

Thanks - Fred
fred.l.templin@boeing.com

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