These networks are not connections to upstream routers, but where we are ourselves are the upstream router, hence it doesn't make too much sense to require them to be up as default to determine if we are "online", because they lead "in the wrong direction". Also, disable DHCP lease persistency for these networks, since container/VM/namespaces are generally shortlived, and typically have no persistent identity. Moreover, the IP range we assign each VM/container connection is just too small to permit persistency, as otherwise we'll run out of leases way too quickly if VM/containers are restarted a bunch of times with different MAC addresses (which I ran into). I think these are better defaults, but of course these are only defaults.
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