para desativar a aceitação do RA:
sysctl -w net.ipv6.conf.<interface>.forwarding=0
sysctl -w net.ipv6.conf.all.forwarding=0
sysctl -w net.ipv6.conf.<interface>.accept_ra=0
sysctl -w net.ipv6.conf.all.accept_ra=0
ou adicione algo assim a / etc / network / interfaces
pre-up echo 0 > /proc/sys/net/ipv6/conf/<interface>/forwarding
pre-up echo 0 > /proc/sys/net/ipv6/conf/<interface>/accept_ra
pre-up echo 0 > /proc/sys/net/ipv6/conf/all/accept_ra
pre-up echo 0 > /proc/sys/net/ipv6/conf/default/accept_ra