What is the docker network create --aux-address option used for?

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The man page for docker network create says ‘Auxiliary ipv4 or ipv6 addresses used by network driver’. This isn’t very illuminating! Anyone have any ideas what it is used for?

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If you need to exclude IP addresses from being used in the Macvlan network, such as when a given IP address is already in use, use --aux-addresses :
Macvlan network driver | Docker Docs

then you put the name of the container and the address ip of the container mentionned like a router for example
aux-addresses:“router=172.18.0.1”