Re: RFC4941bis: consequences of many addresses for the network

[Fernando Gont <[e-mail]>]

On 23/1/20 10:37, Jared Mauch wrote:
> 
> 
>> On Jan 23, 2020, at 8:32 AM, Tim Chown <[e-mail]> wrote:
>>
>> The problem statement section in 4941bis is all about user privacy, no mention of operational / management complexity, or other “general problems” that SLAAC has.  It seems there are unstated problems here :)
> 
> 
> I would +1 this here.
> 
> I would also generally question if rotating IPs is a adequate privacy protector considering there are other ways to identify users that are being (broadly) employed today.
> 
> The complexity that this introduces into networks for operational debugging (provider: what’s your IP address so I can debug? User: Well here’s the 20 on the host because I have limited lifetime privacy addresses, and I don’t know what outbound one it’s using for this connection.  Provider: What’s your IP address so I can debug?  Actually, can you just turn off v6 so I can debug your problem?  User: sure, I just want it fixed).

FWIW, rfc4941bis is a revision of RFC4941, to address existing 
flaws/shortcomings. -- i.e., we're *not* introducing temporary addresses.

As noted, there are networks that wouldn't fancy temporary addresses, 
but then:

* SLAAC is not about managed configuration, but more about anarchy
   in this respect (for better or worse)

* We have a BCP supporting the use of multiple addresses: RFC7934

* Attempts to suggest policy in slaac have been shot down
  (draft-gont-6man-managing-slaac-policy)

* DHCPv6 support is not required, and in fact we seem to do our best to
   trash DHCPv6 and borrow cool DHCPv6 features into slaac as much as
   possible -- which doesn't help the situation.

So... while I sympathize with what you describe (for instance, I was an 
author of draft-gont-6man-managing-slaac-policy), I think what you're 
arguing has more to do with slaac itself, than with rfc4931.

Thanks,
-- 
Fernando Gont
SI6 Networks
e-mail: [e-mail]
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