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nmcli: Add 'dummy' connection type #54854
This merge request adds support for Dummy interfaces in NetworkManager.
Dummy interfaces are used when the address is meant for the local system but nmcli does not manage the lo interface.
Addresses assigned to a dummy interface can be used by applications that bind on a specific address. The network can then be configured to send directed unicast to the machine and the machine will receive the packet and process it normally. Replies will be sent with the source address that received the packet.
This is used for example for anycast addresses that are then advertised out using BGP or similar routing protocols.