troubleshooting
Multicast & UDP for CCTV techs
Multicast and UDP for CCTV in plain language: why scans are chatty, why guest Wi-Fi isolation breaks detection, and quick troubleshooting steps.
Many discovery protocols use UDP and multicast/broadcast. They are fast but fragile: blocked by VLAN boundaries, AP client isolation, or overly clever “smart” switches defaults.
Mental model
Think of UDP discovery as shouting in a room: everyone on the same subnet hears you. Routers between subnets are closed doors unless a helper repeats the shout.
Design lesson
If your standard forbids multicast on camera VLANs, provision an alternate activation path (DHCP option, serial console where available, or staging VLAN).
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