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The daemon no longer depends on the iptables/ip6tables filter-FORWARD chain's policy being DROP in order to implement its port filtering rules. However, if the daemon enables IP forwarding in the host's system config, by default it will set the policy to DROP to avoid potential security issues for other applications/networks. If docker does need to enable IP forwarding, but other applications on the host require filter-FORWARD's policies to be ACCEPT, this option can be used to tell the daemon to leave the policy unchanged. (Equivalent to enabling IP forwarding before starting the daemon, but without needing to do that.) Signed-off-by: Rob Murray <rob.murray@docker.com>