My dhcpv6 seems being blocked by firewall. Every time I try to connect to the network (I mean on linux `nmcli connection up myconnection0`) the log live view show me this:

If I'm not mistaken the ipv6 address ff02::16 should be something relevant to dhcpv6, and therefore should not be blocked.
I also noticed there is some default floating rules:

However these rules' protocol is ipv6-icmp other than icmp, which was blocked and logged.
What should I do to solve this?

If I'm not mistaken the ipv6 address ff02::16 should be something relevant to dhcpv6, and therefore should not be blocked.
I also noticed there is some default floating rules:

However these rules' protocol is ipv6-icmp other than icmp, which was blocked and logged.
What should I do to solve this?