[ANN] host-setup 4.0 released

[Matthew Seaman]

On 03/01/2012 18:11, Devin Teske wrote:
> 
> 
>> -----Original Message-----
>> From: owner-freebsd-hackers at freebsd.org [mailto:owner-freebsd-
>> hackers at freebsd.org] On Behalf Of Matthew Seaman
>> Sent: Tuesday, January 03, 2012 10:07 AM
>> To: freebsd-hackers at 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 at infracaninophile.co.uk               Kent, CT11 9PW

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