Keeping track.
WHAT TO RECORD
Every device What it is and who uses it Whether its address is fixed Whether it needs internet access
WHY
You cannot secure or troubleshoot what you have not counted.
WHERE TO SEE CONNECTED DEVICES
Your router's device list.
WHAT TO DO PERIODICALLY
Review it.
WHAT YOU WILL FIND
Devices nobody recognises Old equipment still connected Personal devices you did not know about
WHAT TO DO ABOUT UNRECOGNISED DEVICES
Identify them before assuming the worst.
Many are equipment with unhelpful names.
WHAT TO NAME CLEARLY
Every device you control.
That makes the list useful.
WHAT TO RESERVE ADDRESSES FOR
Printers Servers Equipment referenced by address
WHAT TO REMOVE
Access for devices no longer used.
WHAT TO REVIEW WHEN SOMEONE LEAVES
Which devices they used, and whether any remain connected.