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So far, Moby only had IPv4 prefixes in its 'default-address-pools'. To get dynamic IPv6 subnet allocations, users had to redefine this parameter to include IPv6 base network(s). This is needlessly complex and against Moby's 'batteries-included' principle. This change generates a ULA base network by deriving a ULA Global ID from the Engine's Host ID and put that base network into 'default-address-pools'. This Host ID is stable over time (except if users remove their '/var/lib/docker/engine-id') and thus the GID is stable too. This ULA base network won't be put into 'default-address-pools' if users have manually configured it. This is loosely based on https://datatracker.ietf.org/doc/html/rfc4193#section-3.2.2. Signed-off-by: Albin Kerouanton <albinker@gmail.com>
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