Date: Tue, 03 Jan 2012 19:05:37 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Devin Teske <devin.teske@fisglobal.com> Cc: freebsd-hackers@freebsd.org Subject: Re: [ANN] host-setup 4.0 released Message-ID: <4F035181.9000605@infracaninophile.co.uk> In-Reply-To: <04d901ccca43$126af200$3740d600$@fisglobal.com> References: <04a201ccca33$fe6115a0$fb2340e0$@fisglobal.com> <2092634439.782373.1325609539518.JavaMail.root@erie.cs.uoguelph.ca> <CAGH67wS7QuqXXAa22yP%2BawDR52yLPBzfvRC3_=_mGR3DtGA2eQ@mail.gmail.com> <4F0343CE.2080500@infracaninophile.co.uk> <04d901ccca43$126af200$3740d600$@fisglobal.com>
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[-- Attachment #1 --]
On 03/01/2012 18:11, Devin Teske wrote:
>
>
>> -----Original Message-----
>> From: owner-freebsd-hackers@freebsd.org [mailto:owner-freebsd-
>> hackers@freebsd.org] On Behalf Of Matthew Seaman
>> Sent: Tuesday, January 03, 2012 10:07 AM
>> To: freebsd-hackers@freebsd.org
>> Subject: Re: [ANN] host-setup 4.0 released
>>
>> On 03/01/2012 17:59, Garrett Cooper wrote:
>>> 4. Prefixing the IPv6 address with fe80: generally means it's an IPv4
>>> -> IPv6 address (IIRC).
>>
>> Nope. That's a link-local address. Any NIC can configure itself with and
> address
>> using that prefix and a host part generated from the MAC address completely
>> automatically, and thus communicate on any locally attached network. (See RFC
>> 5156 for the gory details.)
>>
>> IPv4 mapped addresses are like this:
>>
>> ::ffff:192.0.2.0
>>
>> (or you can express the 32 bits of the IPv4 address as two colon-separated hex
>> strings in the usual IPv6 idiom.)
>
> Out of curiousity, when did the spec change from single-octets to double-octets?
>
> I remember early-on seeing IPv6 addresses represented in a form that resembled
> MAC address specifications.
AFAIK, it's been groups of up to four hex digits from the start --
certainly it's been that way for 15 years or more. At least, I've never
seen anything different, other than the special exemption for IPv4
mapped addresses.
Cheers,
Matthew
--
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
JID: matthew@infracaninophile.co.uk Kent, CT11 9PW
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