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@@ -83,3 +83,26 @@ and volumes run the following command:
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$ rm -rf /var/lib/docker
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You must delete the user created configuration files manually.
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+
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+## Issues
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+
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+### systemd-network
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+
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+Users of systemd-network >= v220 who have configured their network manually by
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+creating an `<interface>.network` file in `/etc/systemd/network/` may have to add
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+the following line to make sure IP Forwarding is not disabled:
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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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+...
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+```
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+
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+From systemd-network v220 onwards, the forwarding setting for a given network
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+defaults to *off* (instead of not being set). This prevents IP Forwarding to
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+happen, since docker only enables `net.ipv4.conf.all.forwarding` (which is
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+overriden by `net.ipv4.conf.<interface>.forwarding` being disabled)
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+
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+Adding `IPForward=kernel` to the `<interface>.network` file prevents this
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+behavior, allowing IP Forwarding to function as expected.
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Oriol Francès