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@@ -206,6 +206,24 @@ If you need to add an HTTP Proxy, set a different directory or partition for the
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Docker runtime files, or make other customizations, read our Systemd article to
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learn how to [customize your Systemd Docker daemon options](/articles/systemd/).
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+## Running Docker with a manually-defined network
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+
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+If you manually configure your network using `systemd-network` with `systemd` version 219 or higher, containers you start with Docker may be unable to access your network.
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+Beginning with version 220, the forwarding setting for a given network (`net.ipv4.conf.<interface>.forwarding`) defaults to *off*. This setting prevents IP forwarding. It also conflicts with Docker which enables the `net.ipv4.conf.all.forwarding` setting within a container.
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+
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+To work around this, edit the `<interface>.network` file in
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+`/usr/lib/systemd/network/` on your Docker host (ex: `/usr/lib/systemd/network/80-container-host0.network`) add the following block:
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+
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+```
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+[Network]
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+...
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+IPForward=kernel
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+# OR
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+IPForward=true
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+...
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+```
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+
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+This configuration allows IP forwarding from the container as expected.
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## Uninstall
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moxiegirl