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Re: [Int-area] draft-bonica-intarea-frag-fragile-01

Joe Touch <touch@strayalpha.com> Sun, 18 March 2018 17:58 UTC

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From: Joe Touch <touch@strayalpha.com>
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Date: Sun, 18 Mar 2018 10:58:16 -0700
Cc: draft-intarea-frag authors <draft-bonica-intarea-frag-fragile@ietf.org>, int-area <int-area@ietf.org>
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To: "C. M. Heard" <heard@pobox.com>
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Subject: Re: [Int-area] draft-bonica-intarea-frag-fragile-01
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FWIW….

Upper layer protocols can also do their own source-frag if they send IP over raw sockets.

Joe


> On Mar 17, 2018, at 2:40 PM, C. M. Heard <heard@pobox.com> wrote:
> 
> Minor Comments:
> 
> Section 2.2, Upper-layer Protocols, says:
> 
>    Upper-layer protocols can operate in the following modes:
> 
>    o  Do not rely on IP fragmentation.
> 
>    o  Rely on IP source fragmentation only (i.e., fragmentation at the
>       source node).
> 
>    o  Rely on IP source fragmentation and downstream fragmentation
>       (i.e., fragmentation at any node along the path).
> 
>    Upper-layer protocols running over IPv4 can operate in the first and
>    third modes (above).  Upper-layer protocols running over IPv6 can
>    operate in the first and second modes (above).
> 
> The first sentence of the last paragraph above is incorrect. In fact upper layer protocols running over IPv4 can operate in the second mode by instructing the IP layer to do source fragmentation and set the DF bit on outgoing packets. I won't argue if you point out that most APIs don't support this mode, but the fact is that the protocol allows for it.

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