[FS#389] odhcpd relay mode is blocked by firewall by default

[LEDE Bugs]

The following task has a new comment added:

FS#389 - odhcpd relay mode is blocked by firewall by default
User who did this - Eric Luehrsen (EricLuehrsen)

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It is common for DHCPv4 firewall rules to be "udp 67-68 allow input", or that is whatever its just DHCP. Perhaps DHCPv6 / RA is the same. However as a consideration, it is highly recommended that ISP all provide DHCP-PD /64 (option /60 for even residential). WAN RA relay would not be the most common tool.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=389#comment1268