[Bug 1807569] Re: netplan accept-ra disables slaac

[Tom Hetmer]

Can we get this reopened (and solved)?

Let's have this config

# This is the network config written by 'subiquity'
network:
  ethernets:
    eno1:
      dhcp4: false
      dhcp6: false
      addresses:
        - 2a09:e201:0:2:921b:eff:feae:82e5/64


What happens now is the system gets the static IPv6 AND autoconf. 

    inet6 2a09:e201::921b:eff:feae:82e5/64 scope global dynamic mngtmpaddr noprefixroute
       valid_lft 2591614sec preferred_lft 604414sec
    inet6 2a09:e201:0:2:921b:eff:feae:82e5/64 scope global
       valid_lft forever preferred_lft forever

I know it's a bug on the network, but there should be a way to do autoconf=0 accept_ra=1.
systemd-networks is kinda weird and I didn't manage to configure it properly with

[IPv6AcceptRA]
UseAutonomousPrefix=no
UseOnLinkPrefix=no

It does nothing.
I don't want accept-ra: false because I'd like to keep using RA acquired gateway.

In Alpine it's as easy as

auto eth1
iface eth1 inet static
  address 2a09:e201:0:2:216:3eff:fe0d:10a6
  netmask 64

net.ipv6.conf.eth1.autoconf=0
net.ipv6.conf.eth1.use_tempaddr=0


There's something weird with netplan + networkd.

** Changed in: netplan
       Status: Expired => Confirmed

** Changed in: netplan.io (Ubuntu)
       Status: Expired => Confirmed

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https://bugs.launchpad.net/bugs/1807569

Title:
  netplan accept-ra disables slaac

Status in netplan:
  Confirmed
Status in netplan.io package in Ubuntu:
  Confirmed

Bug description:
  Hello,

  The netplan flag configuration "accept-ra" does not only enable or
  disable the use of router advertisements, but also stateless
  configuration of addresses. This makes it impossible to configure a
  host with only a static IPv6 address, but with a gateway received
  through RA's (equivalent to sysctl autoconf=0 and accept_ra=1).

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