Re: [Int-area] Comments on draft-ietf-intarea-frag-fragile-06

"Templin (US), Fred L" <Fred.L.Templin@boeing.com> Thu, 31 January 2019 15:53 UTC

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From: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>
To: Stewart Bryant <stewart.bryant@gmail.com>, Fred Baker <fredbaker.ietf@gmail.com>, Tom Herbert <tom@herbertland.com>
CC: int-area <int-area@ietf.org>
Thread-Topic: [Int-area] Comments on draft-ietf-intarea-frag-fragile-06
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Date: Thu, 31 Jan 2019 15:53:36 +0000
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Subject: Re: [Int-area] Comments on draft-ietf-intarea-frag-fragile-06
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Hi Stewart,

Check section 4.5 and 6.4 of the latest draft version:

https://datatracker.ietf.org/doc/html/draft-ietf-intarea-frag-fragile-08

Also, RFC4963 provides a detailed study of "IPv4 Reassembly Errors at
High Data Rates".

But, there is more to it besides just the question of whether to use IP
reassembly or higher layer reassembly. There must be some way for
the sender that inserts the UDP encapsulation to know that the receiver
is capable of removing the encapsulation. So, there must be some form
of tunnel endpoint coordination because, after all, it is really just another
type of tunnel.

Thanks - Fred

From: Stewart Bryant [mailto:stewart.bryant@gmail.com]
Sent: Thursday, January 31, 2019 2:16 AM
To: Templin (US), Fred L <Fred.L.Templin@boeing.com>om>; Fred Baker <fredbaker.ietf@gmail.com>om>; Tom Herbert <tom@herbertland.com>
Cc: int-area <int-area@ietf.org>
Subject: Re: [Int-area] Comments on draft-ietf-intarea-frag-fragile-06



On 30/01/2019 18:55, Templin (US), Fred L wrote:
IP fragmentation shortcomings
(e.g., reassembly errors at high data rates).

How big a problem is this in reality?

If you are going to run at speed you ought to set a conservatively low MTU?

I am always told that the core runs jumbo anyway, so where does the problem arise in practical networks?

- Stewart