Re: [v6ops] Thoughts on draft-byrne-v6ops-clatip-01

[Lorenzo Colitti <[e-mail]>]

On Thu, May 1, 2014 at 8:24 AM, Fred Baker (fred) <[e-mail]> wrote:

> Ask me someday what thoughts go through my mind about applications making
> inferences from network layer addresses.
>

The wording in RFC 3927 is much stronger. For example, it states multiple
times that packets sourced from 169.254/16 MUST NOT be forwarded, and that
they MUST NOT ever be sent to any router for forwarding. I think it's
perfectly reasonable for an app (or even an OS!) to assume that such
addresses have no connectivity.


> Hey, 192.168.0.0/16 is for networks that don’t connect to the Internet.
> You want proof? From RFC 1918, the motivation is
>
>    With the proliferation of TCP/IP technology worldwide, including
>    outside the Internet itself, an increasing number of non-connected
>    enterprises use this technology and its addressing capabilities for
>    sole intra-enterprise communications, without any intention to ever
>    directly connect to other enterprises or the Internet itself.
>

Funny, that's what the proponents of ULA-only networks say too - "no, this
network will NEVER connect to the Internet, ever!!11" I suspect they do so
because they know that saying "we want to use NAT to connect this network
to the Internet like we do in IPv4" is going to result in strong opinions
and removal of support for the use case. But that's off-topic here.