Remove an address from ARP cache on FreeBSD

Here’s a very useful command if you are running pfSense and want to remove a single IP/Mac-mapping from the ARP-table:

arp -d <ip-address>

Since pfSense is a FreeBSD system, you can log in to a shell and do it. This is useful, for example, when you replaced one of your servers behind your firewall with a new one and with this changed the mac address of the hardware.

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