OPNsense 25.7.11 - host/neighbor discovery service

[pfry]

Just opening a thread to observations on the 25.7.11 host/neighbor discovery service.

This release brings the new host discovery service which resolves and remembers
MAC addresses for IPv4 and IPv6 hosts in your connected networks and provides
this data for the firewall MAC aliases and captive portal clients.

GUI: "Interfaces: Neighbors: Automatic Discovery".

I do not use the above features, so I disabled the service. It does not appear to interfere with function, but it does report neighbors/hosts multiple times on bridges (on the bridge and on member interfaces) by default. I thought it might be useful in reporting the member interface to which a particular host is connected, but it does not (limit reporting to that). (Note that I did not exhaustively examine its behavior, e.g. to see if it reported hosts only on member interfaces where it saw a particular MAC as either a source or destination.) Note that this behavior on bridge member interfaces applies because I have them assigned but unconfigured; I assume unassigned interfaces would not be part of the discovery, and discovery scope may be limited under "Settings" in any case.