Listeners are unique to the port and IP combination.
So, for each IP address, each Listener must have a unique port.
For the special case of IP 0.0.0.0, then that's a wild card for "all IP addresses". In that case, a Listener configured on IP 0.0.0.0 will consume the port across ALL IP addresses on the machine.
If you find you want to work with multiple IPs on the same instance of GF, you'll need to disable the default Listeners as they listen on 0.0.0.0.
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