Currently the only way to run docker containers with only an IPv6 stack is to run with host networking on a host running only IPv6. For any other network type, if no IPv4 addresses are specified, they are automatically generated and assigned to the containers.

While it may be reasonable to default to operating in dual-stack mode, it would be good to have an option to create docker networks without an IPv4 stack by supplying a flag like --no-ipv4 or something similar. I'm working in an IPv6-only environment and the automatic v4 addresses are causing problems with things like name resolution.