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When the host has IPv6 support but the container doesn't, the default bind address is 0.0.0.0, and a port mapping does not include a host address - the default behaviour (of the bridge driver) is to run a docker-proxy to map from any IPv6 host address to the IPv4 address of a container's gateway endpoint. Driver option com.docker.network.driver.private.no_proxy_6to4 can now be used to disable that behaviour when configuring a Sandbox's external connectivity. Signed-off-by: Rob Murray <rob.murray@docker.com>