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Re:Apple’s crackdown on multicast by danaris on Tuesday August 24, 2021 @08:44AM (#28288063)
For a LAN: Nothing, but you won't be able to communicate to anyone outside of it. You also won't be able to access it away from wherever you set it up.

For the primary networks at issue here, cellular networks: The FCC, and regulations restricting what devices can access which EM frequencies legally.

Re:Apple’s crackdown on multicast by throw0101a on Tuesday August 24, 2021 @09:53AM (#28288845)
Nit: it is possible to build a private LTE/5G network if you use appropriate spectrum reserved for that purpose:

* https://www.sierrawireless.com/iot-blog/what-are-private-lte...

Not sure about connectivity to the larger / global SS7 network.

Re:Apple’s crackdown on multicast by simonh on Tuesday August 24, 2021 @09:08AM (#28288338)
So, you don't own other people's networks? Right.