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Include setup documentation for bridged networks #4

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@@ -60,6 +60,26 @@ Because we need to "hijack" traffic to the metadata API IP address `169.254.169.
`iptables -t nat -A PREROUTING -d 169.254.169.254 -p tcp --dport 80 --syn -j REDIRECT --to-port 1024`
Don't forget to persist this iptables rule across reboots with some sort of script (`iptables-persistent` apt package is a good candidate)

Kernel Parameters
-----------------
Newer kernels require kernel parameters to be set in order for iptables to intercept traffic over bridged networks

You must enable the `br_netfilter` kernel module with this command:

`modprobe br_netfilter`

Then, enable the kernel settings:

`sysctl -w net.bridge.bridge-nf-call-arptables=1`


`sysctl -w net.bridge.bridge-nf-call-iptable=1`


Make sure you set the parameters in `/etc/sysctl.conf` to persist across reboots

See here for more info: http://wiki.libvirt.org/page/Net.bridge.bridge-nf-call_and_sysctl.conf

Known issues
------------