Bridging and routing create different local communication boundaries. A device can reach the internet across a routed boundary while local discovery between a phone and television remains limited.
Identify the actual topology before changing media settings. The same Wi-Fi name on two boxes does not prove that both devices share one bridged local network.
Locate the boundary
Record the phone and television's intended network, gateway and connection path through supported interfaces. A second router in router mode can create another subnet, while an access point can extend the existing LAN. Guest isolation adds another policy distinction.
Keep full addresses and hardware identifiers private unless an authorized support channel needs them. A simple map can describe the boundary without exposing the entire configuration.
Understand discovery as a separate function
Some local discovery mechanisms rely on link-local multicast behavior. RFC 6762 describes mDNS and the local meaning of its names. Such traffic does not automatically cross every router just because ordinary internet requests do.
That does not mean all casting or remote-control systems use one mechanism, or that a router should forward every multicast packet everywhere. Read the actual platform and network requirements. Internet playback and discovery need separate tests.
Use a supported arrangement
If you administer the network, choose the intended router or access-point role deliberately and follow the exact product's procedure. Reconcile DHCP, security and feature changes before switching modes. Some mesh products restrict bridge-mode use or remove functions.
A managed network may intentionally block client-to-client communication. Ask the administrator for an approved sharing method rather than bypassing isolation. A temporary success on an unrestricted home LAN does not establish what a campus or hotel must permit.
- Map each endpoint and its gateway or network boundary.
- Test direct internet access separately from discovery.
- Read the platform’s actual discovery requirements.
- Use an owner-approved topology or sharing feature.
- Verify the final security policy and normal control method.
Keep the final result precise
If moving both devices into an approved common local network restores discovery, record that function and arrangement. It does not establish that a remote media fault was also fixed or that the account permits extra simultaneous sessions.
If discovery still fails, preserve the topology findings and investigate supported platform permissions or application behavior next. A useful diagnosis narrows the boundary question without turning “bridge everything” into a universal recommendation.
Useful answers
Can both devices have internet while they cannot discover each other?
Yes. Internet routing and local discovery are separate functions, and network policy can permit one while limiting the other.
Should I forward all multicast to fix casting?
No. Use the actual platform and network owner’s supported arrangement. Broad forwarding can defeat intended boundaries and may not address the mechanism in use.