Improvement: hint for specifying router advertisement source address

[fzakfeld]

Is your feature request related to a problem? Please describe.

The router advertisement config has the option to specify a source address, e.g. for HA setups where CARP is used as the gateway address. However, it might not be clear to everyone that this needs to be a LLA to work. GUA/ULA won't show (which is correct), but this might confuse a user coming from IPv4 and DHCP.

Describe the solution you like

A hint would be useful, e.g. "Only LLA can be used"

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[Monviech]

There's documentation here:

https://docs.opnsense.org/manual/how-tos/carp.html#configuring-carp-with-ipv6
https://docs.opnsense.org/manual/how-tos/carp.html#setup-virtual-ipv6-link-local-address