Yes, /24 would only allow 250 or so addresses, we do need a /16 . I am not sure why 172.17 and 172.18 networks are conflicting though . In the original error message it says "172.18.0.1" is in use. If your local network is 172.18, it all makes sense. Currently, there is no workaround for this since the code has some places where it hardcodes 172.18 network.
I
iamwillbar
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