Re: net.ipv6.conf.all.accept_ra=0 net.ipv6.conf.default.accept_ra=0 not working?!

[Reinder <reinder@reinder.nl>]

> At the moment I am thinking maybe ifup is still doing something? Though 
> there is no inet6 configuration in /etc/network/interfaces:
It seems to be indeed an ifupdown issue, forcing a static ipv6 in 
/etc/network/interfaces works, see below.
Problem is I did not want to do this. Will debug some more.

root@reinder:~# sysctl -a | grep accept_ra\
net.ipv6.conf.all.accept_ra = 0
net.ipv6.conf.default.accept_ra = 0
net.ipv6.conf.ens18.accept_ra = 0
net.ipv6.conf.ens19.accept_ra = 1
net.ipv6.conf.lo.accept_ra = 1
root@reinder:~# sed 's#[0-9]*:*:*:*:*:#xx:xx:xx:xx:xx:#' 
/etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug ens18
iface ens18 inet dhcp
iface ens18 inet6 static
        address xx:xx:xx:xx:xx:7b8:627:2::d59a:fd8c/64
        autoconf 0
        accept_ra 0

# The secondary network interface
allow-hotplug ens19
iface ens19 inet dhcp
root@reinder:~# ip a s dev ens18|grep kernel_ra|sed 
's#[0-9]*:*:*:*:*:#xx:xx:xx:xx:xx:#'
root@reinder:~#