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Re: draft-bonica-6man-frag-deprecate

Mark Andrews <marka@isc.org> Fri, 28 June 2013 00:15 UTC

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To: Karl Auer <kauer@biplane.com.au>
From: Mark Andrews <marka@isc.org>
References: <2CF4CB03E2AA464BA0982EC92A02CE2509F85151@BY2PRD0512MB653.namprd05.prod.outlook.com> <51C32FA9.1090207@gmail.com> <2CF4CB03E2AA464BA0982EC92A02CE2509F85F38@BY2PRD0512MB653.namprd05.prod.outlook.com> <20130624204008.GB3647@virgo.local> <20130624205226.GC3647@virgo.local> <2CF4CB03E2AA464BA0982EC92A02CE2509F8761C@BY2PRD0512MB653.namprd05.prod.outlook.com> <51C902DC.9000408@gmail.com> <m24ncmaozs.wl%randy@psg.com> <2EA20F89-02F5-4D06-90EE-A7D2974045A3@employees.org> <m2li5yj7u3.wl%randy@psg.com> <8C48B86A895913448548E6D15DA7553B9268E3@xmb-rcd-x09.cisco.com> <m2ehbpij86.wl%randy@psg.com> <51CB91E4.5090603@gmail.com> <CADoTVZLe=dm+JhMSAxFiAYpUMG=T-cUFdtkdHtmzmebG9=Dujw@mail.gmail.com> <2134F8430051B64F815C691A62D983180AECDE@XCH-BLV-504.nw.nos.boeing.com> <CADoTVZLEKt1FdB+UadvAM6AeVZ3Weacm+0o74F9aYqxmrisBqg@mail.gmail.com> <00de01ce7385$15428a50$3fc79ef0$@tndh.net> <20130627233130.345EB36613EA@drugs.dv.isc.org> <1372377611.3215.141.camel@karl>
Subject: Re: draft-bonica-6man-frag-deprecate
In-reply-to: Your message of "Fri, 28 Jun 2013 10:00:11 +1000." <1372377611.3215.141.camel@karl>
Date: Fri, 28 Jun 2013 10:15:27 +1000
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In message <1372377611.3215.141.camel@karl>, Karl Auer writes:
> On Fri, 2013-06-28 at 09:31 +1000, Mark Andrews wrote:
> > Then add a cryptographic checksum of the original packet when fragmenting.
> > 48 bits in a HBH should be enough.
> 
> Why HBH? Is that to prevent it being send in a fragment itself? And, um,
> I hate to suggest this, but isn't that sort of exactly what the AH
> header is for? I know, I know.... (covers head, ducks)

I really don't care which header it is included in.  If we could
drop it to 32 bits we could just set the fragment id to the checksum
and use one of the reserved bits to indicate that one should treat
it as a checksum.  My gut feel is that 32 bits is a little to small
however.

> Regards, K.
> 
> -- 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Karl Auer (kauer@biplane.com.au)
> http://www.biplane.com.au/kauer
> http://twitter.com/kauer389
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org

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