Docker Subnet Mac Host I

From the Mac host I can ping all these servers without an issue.

I tried the same thing on a Linux machine and a Windows machine and could not reproduce the issue.

It might have something to do with the fact that the docker network is usually on 172.18.

However, I could not figure it out.

If you want a good start, from your mac, make a traceroute 172.20..

Docker is using its gateway 172.18.0.1 for anything behind it, therefore it is also necessary to check the internal firewall of the machine hosting it.

If there was a firewall in the network, the host wouldnt be able to reach that server too, no I also made sure the Macs firewall is turned off, so I dont think thats the issue.

Per the docker documentation on network settings, it allows the container to share the network stack of the host.

Then you can ensure that network bridge has a route to the subnet you are looking for.

Youll need to restart docker to pickup changes in the wifi connections, VPNs, etc.

Other docker networks on 172.20.x.x that you cant directly see may also be causing issues.

If you see an overlap for the route to 172.20., thats your issue.

To solve this, as of 18.06, you can tell docker to generate bridge networks from a pool with the following in the daemon.json file (also available in desktop from the daemon - advanced menu).

For swarm mode, it has similar settings when you create the swarm as of 18.09.

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Docker For Mac Subnet