IPv6 implementation does not comply to RFC 7217 and 7721

[GoetzGoerisch]

The problem

The newly integrate and now working IPv6 implemenation generates its IID based on the MAC of the device which is considered to bad from a Security and Privacy standpoint.

Which version of ESPHome has the issue?

2024.3.0

What type of installation are you using?

Home Assistant Add-on

Which version of Home Assistant has the issue?

2024.3.1

What platform are you using?

ESP8266

Board

esp01_1m

Component causing the issue

network

Example YAML snippet

esp8266:
  board: esp01_1m
  framework:
    version: recommended
    platform_version: 4.2.1


network:
    enable_ipv6: true

Anything in the logs that might be useful for us?

[wifi:416]:   IP Address: FE80::AAAA:BBFF:FECC:DDDD
[wifi:416]:   IP Address: 2001:DB8::AAAA:BBFF:FECC:DDDD
[wifi:416]:   IP Address: FD00::AAAA:BBFF:FECC:DDDD

Additional information

https://datatracker.ietf.org/doc/rfc7721/
https://datatracker.ietf.org/doc/rfc7217/

[HeMan]

LwIP, which is the IP-stack used here, doesn't have privacy extension, and there seem to be no recent discussion about it either. I found a question from 2022, https://lists.nongnu.org/archive/html/lwip-users/2022-08/msg00007.html, but nothing more.

[GoetzGoerisch]

Then at least this deviation should be clearly documented as this might have consequences for the infrastructure and the users privacy.

Source is here, if I'm not mistaken?
network.rst

I would propose a PR is this is something you would merge?