Clear the ARP table
arp -d -a
Clear the NDP table
ndp -c (seriously! What the hell does the c stand for?)
https://www.computerhope.com/unix/arp.htm
https://www.freebsd.org/cgi/man.cgi?query=arp&sektion=8
https://www.freebsd.org/cgi/man.cgi?query=ndp&sektion=8&manpath=FreeBSD+8.1-RELEASE
