Mailinglist Archive: opensuse (1599 mails)

[Adam Tauno Williams <awilliam@xxxxxxxxxxxxxxxx>]

> > > > NAT seems completely superfluous when the networks are dished out
> > > > as /64.  I did notice that there is a reserved range of
> > > > private/local/site-unique addresses (prefix fd), but I'm not quite
> > > > sure what that is intended for.
> > > My understanding is those are addresses that can be used within an
> > > organization, either through a router or not, but not accessable by
> > > the world. 
> > That's the weird thing - it doesn't say so.  At least not in wikipedia. 

Yea, that's a credible source. :)

> > The 40-bit site-id is supposed to be random, so the unique local
> > address isn't guaranteed to be unique, but does have a very high
> > probability of being so. The thing is - todays RFC1918 IPv4 addresses
> > are obviously not unique, but also not routable, but what's with these
> > most-probably-unique IPv6 addresses that appear to be routable?
> It's been a while since I read about it, but there are different tiers
> of addresses.  The bottom address range is based strictly on the MAC
> address and is non-routeable.  There are also other tiers that are
> limited to an organization or even to a part of the organization.  These
> ranges are routeable, but not allowed on the internet, in the manner of
> RFC1918.  Address ranges in IPv6 is a topic in and of itself.

2001::/16 - Allocated to RIRs
2002::/16 - Allocated to 6t4
fe80::/10 - Link local, those-MAC-derived addresses, at least for
Ethernet.  It uses a mechanism knows as SLAAC to come up with, at least
on Ethernet, theoretically unique address.
fec0::/10 - Site local, like 192.168.x.x, 10.x.x.x, etc...
fc00::/8  - Unique Local,  allocation still up in the air last I knew.
But these are like a real network address but not routeable (?).
fd00:/8 - Another kind of Unique Local, even more mysterious than
fc00::/8.  But you can get one from SixXS who seem to have appointed
themselves as a registrar.  This is what we use internally (one of
these) for now.
-- 
OpenGroupware developer: awilliam@xxxxxxxxxxxxx
<http://whitemiceconsulting.blogspot.com/>
OpenGroupare & Cyrus IMAPd documenation @
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