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David Johnson authored
Allowing vnode experiments running on shared nodes to share IPv4 subnets is a natural thing in Emulab; not so in Docker. This is the Emulab side of that fix. The Docker side relies on modifications to Docker (see https://gitlab.flux.utah.edu/emulab/moby/commits/emulab) to add a real Layer 2 mode to the bridge and macvlan drivers, so that Docker doesn't require IPv4 configuration of the bridge; and so that it allows Layer 2-only bridges to have overlapping IP subnets. Normally it does not allow the latter because it expects that any network might be routable/reachable by any other network.
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