Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop
Joe Touch <touch@isi.edu> Thu, 25 October 2012 23:52 UTC
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Date: Thu, 25 Oct 2012 16:51:14 -0700
From: Joe Touch <touch@isi.edu>
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To: Andrew Yourtchenko <ayourtch@cisco.com>
References: <201210161245.q9GCj0i26478@ftpeng-update.cisco.com> <E1829B60731D1740BB7A0626B4FAF0A65E0DEDF3A2@XCH-NW-01V.nw.nos.boeing.com> <507DA6A3.20807@inex.ie> <E1829B60731D1740BB7A0626B4FAF0A65E0DEDF3C3@XCH-NW-01V.nw.nos.boeing.com> <507DAB13.2010704@inex.ie> <E1829B60731D1740BB7A0626B4FAF0A65E0DEDF3CE@XCH-NW-01V.nw.nos.boeing.com> <507DDF8A.9010607@inex.ie> <E1829B60731D1740BB7A0626B4FAF0A65E0DEDF5AB@XCH-NW-01V.nw.nos.boeing.com> <BB219517-B488-4777-AE9C-35C57BE91263@kumari.net> <Pine.LNX.4.64.1210171337470.7337@shell4.bayarea.net> <AC530E99-4054-4B0A-9B5C-30F9EF4A530C@kumari.net> <20121018223121.28B2C2A0041D@drugs.dv.isc.org> <50812F87.5000107@inex.ie> <E1829B60731D1740BB7A0626B4FAF0A65E0DF5C66F@XCH-NW-01V.nw.nos.boeing.com> <5085319B.60707@inex.ie> <CAKD1Yr2qDsM6cCPapRmKuWw7SG-cuMd9PuiBD7ineqj7Bp4+Xw@mail.gmail.com> <8C4093E0-4031-4057-9B96-3738A5A48D2D@merike.com> <alpine.DEB.2.02.1210260056210.15761@ayourtch-lnx>
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Cc: V6 Ops <v6ops@ietf.org>
Subject: Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop
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I'm not sure whether noting the issue is critical or not, but tonly one of these examples is useful, IMO, as noted below: On 10/25/2012 4:30 PM, Andrew Yourtchenko wrote: ... > +1 on documenting, maybe worth adding to the section 2.2 a few more > protocol case studies: > > http://www.ietf.org/mail-archive/web/ipsec/current/msg07749.html This one seems useful to the point being discussed (of "drop all" fragment cases in the wild). > http://www.ietf.org/proceedings/71/slides/radext-4.pdf The above is more about trying to avoid fragmentation than any specific reason that fragmentation is a problem. Fragmentation is known to increase probability of drop (opportunity for reassembly overload, increased exposure to the impact of a packet drop). This example isn't directly about "drop all" cases, though. > http://support.microsoft.com/kb/244474 >From that link: "Because UDP is a connectionless protocol, fragmented UDP packets will be dropped if they arrive at the destination out of order. " 1) because UDP is connectionless, UDP packets should be tolerated out of order 2) fragments should already be tolerated out of order So I can't understand why fragmented UDP packets should be dropped if they arrive out of order except as an implementation error. Is this being noted as "bad advice arising from an implementation error"? If not, then it might not be useful to include. > Alongside with that, also probably something like > http://tools.ietf.org/html/rfc4347#section-4.2.3 could be also > referenced as an example of application protocol's approach to > fragmentation, alongside with > http://tools.ietf.org/html/draft-smyslov-ipsecme-ikev2-fragmentation-00, > http://tools.ietf.org/html/draft-perez-radext-radius-fragmentation-03, > > This might help future app protocol writers' design choices, even if the > document does not give the explicit advice (the fact on which I do not > have an explicit opinion). That advice presumes that the fragment size can be detected by the application; this is sometimes not the case. If such are being noted, the it might be useful to also at least recommend PLPMTUD (RFC 4821). Joe
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- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Mark Andrews
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop sthaug
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- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Brian E Carpenter
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Ole Trøan
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