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Re: [v6ops] Fragments [ULA draft revision #2 Regarding isolated networks]

"Templin, Fred L" <Fred.L.Templin@boeing.com> Wed, 28 May 2014 14:37 UTC

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From: "Templin, Fred L" <Fred.L.Templin@boeing.com>
To: Philip Homburg <pch-v6ops-3a@u-1.phicoh.com>, v6ops WG <v6ops@ietf.org>
Thread-Topic: [v6ops] Fragments [ULA draft revision #2 Regarding isolated networks]
Thread-Index: AQHPeoBctRwXeugDckevBPuYoqC0+JtWDPmw
Date: Wed, 28 May 2014 14:37:10 +0000
Message-ID: <2134F8430051B64F815C691A62D983181B2B6F86@XCH-BLV-504.nw.nos.boeing.com>
References: <8AE0F17B87264D4CAC7DE0AA6C406F453D8B6B9A@nkgeml506-mbx.china.huawei.com> <m261ks7xww.wl%randy@psg.com> <53840070.90801@gmail.com> <m2y4xn7wep.wl%randy@psg.com> <53840723.8010606@gmail.com> <CAKD1Yr1O_poMR200sjU=ttRvGaeQRkC1ZfXC0Ok4uQxdq3K=NQ@mail.gmail.com> <m2mwe37tbn.wl%randy@psg.com> <CAKD1Yr2t3-vxuG=iDi4biBNFpJwuzuHgfpB74i_uydWWRV7qZg@mail.gmail.com> <8AE0F17B87264D4CAC7DE0AA6C406F453D8B6E02@nkgeml506-mbx.china.huawei.com> <m2fvjv7q4h.wl%randy@psg.com> <m1WpDcc-0000BMC@stereo.hq.phicoh.net> <43BB867C-7BCA-45F6-8ADC-A49B34D6C0DC@nominum.com> <5384937A.90409@foobar.org> <96747494E3D74D41B20907035DB1E48D335AAB3D@MOPESMBX03.eu.thmulti.com> <20140527222313.7B12716B8D59@rock.dv.isc.org> <53851236.8020209@bogus.com> <5385522F.40305@gmail.com> <4BA71D7E-7A38-4327-8C7D-7E49F047CDDB@ecs.soton.ac.uk> <EMEW3|51fc5e85b5e6c2650a1f63c2b27fdf6fq4RARx03tjc|ecs.soton.ac.uk|4BA71D7E-7A38-4327-8C7D-7E49F047CDDB@ecs.soton.ac.uk> <2134F8430051B64F815C691A62D983181B2B5F33@XCH-BLV-504.nw.no s.boeing.com> <m1Wpel8-0000BZC@stereo.hq.phicoh.net>
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Subject: Re: [v6ops] Fragments [ULA draft revision #2 Regarding isolated networks]
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Hi Philip,

> -----Original Message-----
> From: v6ops [mailto:v6ops-bounces@ietf.org] On Behalf Of Philip Homburg
> Sent: Wednesday, May 28, 2014 7:23 AM
> To: v6ops WG
> Subject: Re: [v6ops] Fragments [ULA draft revision #2 Regarding isolated networks]
> 
> In your letter dated Wed, 28 May 2014 14:15:48 +0000 you wrote:
> >> Tests that Fernando and I reported at the last IEPG show around 50% of the Alexa top
> >1m sites which
> >> support IPv6 also drop frags.  Tests for other types of EH are far from encouraging t
> >oo.
> >
> >Then, how are we ever going to support tunnels over IPv6?
> 
> Measurements using RIPE Atlas suggest that most filtering is done near the edges.
> So if you want a tunnel, make sure that your site and the remote site don't do that
> kind of filtering.

Interesting, but I'm not sure how that would play for "opportunistic"
tunnels where there may not be a way to manipulate the filters at the
remote site. 

> In addition, fragmentation involving DNS seems to work way better than sending
> fragmented packets to the Alexa top 1m sites. So the kind of filtering you encounter
> may also depend on where you look.

OK. But additionally in the tunnel case we need IPv6 fragmentation
to work across whatever opportunistic path the tunnel happens to
traverse.

Thanks - Fred
fred.l.templin@boeing.com
 
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