@@ -83,3 +83,26 @@ and volumes run the following command:

     $ rm -rf /var/lib/docker

 You must delete the user created configuration files manually.

+

+## Issues

+

+### systemd-network

+

+Users of systemd-network >= v220 who have configured their network manually by

+creating an `<interface>.network` file in `/etc/systemd/network/` may have to add

+the following line to make sure IP Forwarding is not disabled:

+

+```

+[Network]

+...

+IPForward=kernel

+...

+```

+

+From systemd-network v220 onwards, the forwarding setting for a given network

+defaults to *off* (instead of not being set). This prevents IP Forwarding to

+happen, since docker only enables `net.ipv4.conf.all.forwarding` (which is

+overriden by `net.ipv4.conf.<interface>.forwarding` being disabled)

+

+Adding `IPForward=kernel` to the `<interface>.network` file prevents this

+behavior, allowing IP Forwarding to function as expected.