ipv6有状态和无状态
config dhcp lan
option ra 'server'
option dhcpv6 'server'
option ra_management '0' #default value is 1
#0 means stateless only
#1 means stateless and stateful (default)
#2 means stateful
连接:https://openwrt.org/fr/docs/guide-user/network/ipv6/freebox