Anyone with docker group permission can go inside your container. Secondly, your container still runs as root and launch with -privileged options. Then you don't need to be user root in Dockerfile. Most of my googling turns up issues about setting DNS flags.
Here are the details - My Macbook: OS: MacOS High Sierra (Version 10.13.6) Docker: Version 18.06.1-ce, build e68fc7a Ubuntu VPS: OS: Ubuntu 16.04.5 LTS Docker: Version 18.06. PING 216.58.194.174 (216.58.194.174) 56(84) bytes of data.Ħ4 bytes from 216.58.194.174: icmp_seq=1 ttl=46 time=20.5 msġ packets transmitted, 1 received, 0% packet loss, time 0ms I tried to ping from Ubuntu container using docker exec., and the ping works fine. Communication between devices is commonly done via the Ethernet protocol (wiki), and despite the source and destination being identified by IP, actual. For most applications it’s usually a simple matter of setting an environment variable or changing a config file to configure a HTTP proxy for an application. This is exactly how Docker enables container-to-host communication for bridge networks. and the host can be reached from the network namespace using the IP address of the bridge.
To understand why, you must know a thing or two about how the internet works. However if you’re using Docker in a corporate environment, sometimes you are forced to use a HTTP proxy as outgoing connections to ports 80 and 443 are often blocked. Now we can reach the network namespaces from the host. This is evidenced by being able to ping a resolved ip address for (such as 172.217.4.142, which was resolved on a different computer), but not being able to ping . In short, the answer is no, you usually can't block based on MAC address.
Running a (slightly modified) Ubuntu:16.04 docker image, cannot access DNS servers.
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