Site-Local/Unique-Local Addressing (IPv6)

[bill at herrin.us (William Herrin)]

On Mon, Jan 8, 2018 at 12:03 PM, Nicholas Warren <nwarren at barryelectric.com>
wrote:

> Layman here, I was reviewing RFCs for a local address for IPv6. I came
> across two RFCs that seem interesting.
>
> 3879 Which deprecates Site Local Addresses.
> 4193 Which seems to add Unique Local Addresses.
>
> What is the main difference here? Why was this standard removed then added
> back?
>

Hi Nich,

ULA is the IPv6 equivalent to RFC1918. If assigned as instructed
(randomly), it can be used to build multi-organziation private networks
with a relatively low risk of collision, a property lacking in RFC1918.
Other than that, it's exactly the same as RFC 1918.

Site local is deprecated. As explained in the RFC, the concept of a "site"
could not be usefully defined for the purpose of private addressing. You
can safely ignore it.

Regards,
Bill Herrin

-- 
William Herrin ................ herrin at dirtside.com  bill at herrin.us
Dirtside Systems ......... Web: <http://www.dirtside.com/>