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Now a gratuitous/unsolicted ARP is sent, there's no need to use an IPv4-based MAC address to preserve arp-cache mappings between an endpoint's IP addresses and its MAC addresses. Because a random MAC address is used for the default bridge, it no longer makes sense to derive container IPv6 addresses from the MAC address. This "postIPv6" behaviour was needed before IPv6 addresses could be configured, but not now. So, IPv6 addresses will now be IPAM-allocated on the default bridge network, just as they are for user-defined bridges. Signed-off-by: Rob Murray <rob.murray@docker.com>