On 03/01/2012 18:11, Devin Teske wrote: > > >> -----Original Message----- >> From: owner-freebsd-hack...@freebsd.org [mailto:owner-freebsd- >> hack...@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: matt...@infracaninophile.co.uk Kent, CT11 9PW
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