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Static IPv6 gateway not working on Buster


I have a serious issue with IPv6 after upgrading several hosts from Jessie to Stretch.

Default gateway cannot be set using gateway kword in /etc/network/interfaces. After some research over Internet, I figured out this is probably related to router advertisement so I added a list of pre-up command to disable everything.

systemctl status networking was then okay, but after some time (days ?) the IPv6 gateway is gone, again....

Thanks in advance,


auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
        dns-domain domain.lan
iface eth0 inet6 static
        #address 2001:eee:4444:150::216
        address 2001:eee:4444:150::181
        netmask 64
        gateway 2001:eee:4444:150::1
        pre-up echo 0 > /proc/sys/net/ipv6/conf/eth0/autoconf
        pre-up echo 0 > /proc/sys/net/ipv6/conf/eth0/accept_ra
        pre-up echo 0 > /proc/sys/net/ipv6/conf/eth0/accept_ra_defrtr
        pre-up echo 0 > /proc/sys/net/ipv6/conf/eth0/accept_ra_pinfo
        pre-up echo 0 > /proc/sys/net/ipv6/conf/eth0/accept_ra_rtr_pref