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

Suresh Krishnan <suresh.krishnan@ericsson.com> Wed, 20 May 2015 04:13 UTC

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From: Suresh Krishnan <suresh.krishnan@ericsson.com>
To: "Templin, Fred L" <Fred.L.Templin@boeing.com>, "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: Wed, 20 May 2015 04:12:52 +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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Hi Fred,

On 05/19/2015 05:07 PM, Templin, Fred L wrote:
> 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.

As we discussed before, this draft just documents an existing solution 
that has been widely deployed. If you want to bring a better solution to 
the table, that is a fine idea. Please start that discussion in a 
separate thread.

Thanks
Suresh

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