Why does a guest device not see my printer or Sonos?
Guest networks are normally isolated for safety, so local discovery and device-to-device access may be blocked.
Guest isolation; VLAN; controller location.
Network owner/engineer.
Show the technical detail
On a managed Wi-Fi plan
Move authorised trusted devices to the correct LAN or design IoT segmentation.
On another provider's router
Provider guest behaviour differs.
What to be careful of
Do not disable isolation globally for convenience.
Where this comes from: Official · see the original source ↗ · Draft—technical review · checked 17 August 2026