this one is old, but this is mostly used for rootless containers or well-thought VM setups where you need to properly route things. There are a dozen flavours o

this one is old, but this is mostly used for rootless containers or well-thought VM setups where you need to properly route things. There are a dozen flavours of user mode virtual network devices and routers to use. All of varying combinations of maturity, features, performance. All that was out of fashion during the brief period everyone fired sysadmins and all devs got a "devops" tshirt, and then everyone just run Docker as root with bridge mode network.