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Add arch install docs warning about systemd-network 

Signed-off-by: Oriol Francès <oriolfa@gmail.com>
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Oriol Francès 2015-07-26 10:10:42 +02:00
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docs/installation/archlinux.md
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@ -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.