Re: [v6ops] draft-buraglio-v6ops-ula discussion

[Fernando Gont <[e-mail]>]

Hi, Eric,

On 5/8/22 06:45, Eric Vyncke (evyncke) wrote:
> [Wearing no special hat in this reply]
> 
> I would prefer NOT adopting this I-D in his current state for the 
> reasons listed below:
> 
> This may be an unexpected behavior, but I still prefer using global IPv4 
> addresses (not RFC 1918) rather than ULA. The I-D should cover this.

Adoption question aside, I believe the I-D should probably keep its 
focus on the narrow/specific issue it is meant to solve.. (Unfotunately, 
we don't have  a good track record discussing ULAs :-) )



> In section 3, there is:
> 
>    “necessitate the immediate update to [RFC6724] to better reflect
>     the original intent of the RFC.”
> 
> The “immediate update” kinds of contradict the current intended status 
> of “informational”. Moreover, I am unsure whether this I-D authors and 
> the V6OPS WG can declare anything about the “original intent of RFC 
> 6724” as it was a 6MAN WG document ;-)

If the intent is to provide a problem statement -- as I believe it was 
-- I'd definitely focus on the probably statement, or at most hint 
solutions, rather than require them (agree with you on this one).




> Finally, with free IPv6 GUA, I wonder why the IETF should spend time on ULA.

Well, my rule of thumb in this respect is: fix-it, or ditch it ;-).
I do believe there's value in ULAs for some scenarios/cases.
However, i there was consensus that they are just useless, I'd rather 
formally deprecate them that keep them lying around.

They are indeed used here and there. e.g., coincidentially just a few 
minutes ago:

fgont@laptop:~/code/ipv6toolkit/tools$ sudo blackhole6 www.google.com 
do8 icmp
SI6 Networks IPv6 Toolkit (current)
blackhole6: A tool to find IPv6 blackholes
Tracing www.google.com (2800:3f0:4002:810::2004)...

Dst. IPv6 address: 2800:3f0:4002:810::2004 (AS15169 - GOOGLE, US)
Last node (no EHs): 2800:3f0:4002:810::2004 (AS15169 - GOOGLE, US) (8 
hop(s))
Last node (DO 8): fc00:0:200:6c::1 (AS Unknown - Unknown organization) 
(3 hop(s))
Dropping node could not be determined (you may want to try again)

Cheers,
-- 
Fernando Gont
SI6 Networks
e-mail: [e-mail]
PGP Fingerprint: F242 FF0E A804 AF81 EB10 2F07 7CA1 321D 663B B494