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Re: [Int-area] WG Adoption Call: IP Fragmentation Considered Fragile

Ron Bonica <rbonica@juniper.net> Wed, 25 July 2018 22:44 UTC

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From: Ron Bonica <rbonica@juniper.net>
To: "int-area@ietf.org" <int-area@ietf.org>
Thread-Topic: WG Adoption Call: IP Fragmentation Considered Fragile
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Archived-At: <https://mailarchive.ietf.org/arch/msg/int-area/nhZFFlE8ggS4Tl2AZAnhVzpV2LI>
Subject: Re: [Int-area] WG Adoption Call: IP Fragmentation Considered Fragile
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Brian,

I agree that we need more text in this area. Let's chat off-line.

                                    Ron


> 
> Message: 2
> Date: Wed, 25 Jul 2018 15:37:48 +1200
> From: Brian E Carpenter <brian.e.carpenter@gmail.com>
> To: Wassim Haddad <wassim.haddad@ericsson.com>,
> 	"internet-area@ietf.org" <int-area@ietf.org>
> Cc: "intarea-chairs@ietf.org" <intarea-chairs@ietf.org>
> Subject: Re: [Int-area] WG Adoption Call: IP Fragmentation Considered
> 	Fragile
> Message-ID: <9fe7b797-3442-5a00-6e77-a8c3a1ec4617@gmail.com>
> Content-Type: text/plain; charset=utf-8
> 
> +1 for adoption.
> 
> However, I am a bit concerned about this key recommendation:
> 
> >    Application developers SHOULD NOT develop applications that rely on
> >    IPv6 fragmentation
> 
> It isn't obvious to me that this is an algorithmic requirement. If the application
> runs over TCP, how does the developer ensure that TCP will use an MSS that
> avoids the need for fragmentation? (The UDP situation is a bit clearer, but
> RFC8085 introduces considerable complexity, unless we accept that the
> Internet MTU for UDP is 576 or 1280.)
> 
> Regards
>    Brian
> 
> 
> 
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