The pfsense log entries mention arp only because they're indicating that the ARP table has updated with a changed entry. But ONLY the .251 address gets changed to a different MAC, ...

Pfsense is getting ip address on the WAN side. Everything is fine. After a few more hours the modem goes out again. Checked the log on the modem and it said uptime was only about 4 minutes. Same ...

When taking steps to ensure network security, the pfSense firewall solution and Netgear routers are top choices. Compare the key features.