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Re: [v6ops] PMTUD issue discussion

"Fred Baker (fred)" <fred@cisco.com> Fri, 05 September 2014 00:58 UTC

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From: "Fred Baker (fred)" <fred@cisco.com>
To: Fernando Gont <fgont@si6networks.com>
Thread-Topic: [v6ops] PMTUD issue discussion
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Date: Fri, 05 Sep 2014 00:58:16 +0000
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References: <0D370E74-688B-4EB3-A691-309A03AF20BA@cisco.com> <53FBA174.2040302@isi.edu> <53FBA6E1.90905@bogus.com> <CAPi140PMeM9omtm11+NHa2ywUfof_tE7HknKExtoEb32mm7L_w@mail.gmail.com> <71D0D5E8-80E9-430B-8ED4-16C1F99082CC@cisco.com> <54020ECC.4000000@globis.net> <CAEmG1=redpYUnv9R-uf+cJ4e+iPCf6zMHzVxeKNMGjcC=BjR+Q@mail.gmail.com> <5402C26A.8060304@globis.net> <540626F6.1020103@scea.com> <60533790-9A16-44C8-8239-89AE2C6BD783@cisco.com> <5408F6C6.3030103@gont.com.ar> <080303C1-D09F-4987-B114-F0F5C8B44863@cisco.com> <5409080E.7000200@si6networks.com>
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Cc: "v6ops@ietf.org" <v6ops@ietf.org>, Tom Perrine <tperrine@scea.com>, Fernando Gont <fernando@gont.com.ar>
Subject: Re: [v6ops] PMTUD issue discussion
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On Sep 5, 2014, at 10:47 AM, Fernando Gont <fgont@si6networks.com> wrote:

> On 09/04/2014 09:24 PM, Fred Baker (fred) wrote:
>> 
>> On Sep 5, 2014, at 9:33 AM, Fernando Gont <fernando@gont.com.ar>
>> wrote:
>> 
>>> What happens when/if such lins employ v6 (whether they really
>>> offer a "virtual" MTU >=1280).. I just don't know.
>> 
>> 802.15.4?
> 
> No. I seem to recall that it was more of a packet radio sort of thing
> (something predating 802.15.4). I could ask some folks if interested
> in more details…

I think you missed my point. We have a case in point today, which is IPv6 in an IPv6 tunnel encapsulation running on a packet network whose MTU is 127 bytes. We call it “6lowpan”, and it runs on IEEE 802.15.4.

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