If there’s one thing every network admin learns the hard way, it’s that DHCP problems rarely announce themselves politely. One minute everything is fine, and the next users are wandering the office asking why Wi-Fi suddenly stopped working. That’s why proactive DHCP troubleshooting matters. Instead of waiting for a full-blown outage, keeping an eye on your DHCP logs can reveal warning signs long before devices start losing addresses and chaos begins. In this example, I will refer to Ubiquiti EdgeRouters, since I'm working with them quite a bit lately. One of the best places to start is the trusty command sudo cat /var/log/dhcpmasq.log
FYI. the same methodology and tips will apply to any DHCP server.
