Kea DHCPv6 doesn't seem to get incoming traffic. I checked with tcpdump (or other traffic capture software) that the incoming traffic is reaching the box. What's wrong?
Please check whether your OS has any IPv6 filtering rules. Many operating systems are shipped with firewalls that discard incoming IPv6 traffic by default. In particular, many Linux distributions do that. Please check the output of the following command:
# <code>ip6tables -L -n</userinput></code>
One common mistake is to use the
iptables tool, which lists IPv4 firewall rules only.