@ts_itops so you take your phone from network X to network Y, and then on Y you see a storm of retrans still trying to talk to IP 192.168.1.100, even say when your now on 192.168.2/24 ?
Or your seeing this traffic on network X, even though your phone is no longer on the X network?
And this traffic comes from pfsense, or goes through pfsense? If it comes through or from pfsense then yeah the arp cache on pfsense would still think phone IP with mac xyz is still there and sure could continue to send traffic even if phone is no longer on the network. In such a case then sure lower arp cache time on pfsense would lower the amount of time such traffic could be sent.