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An introduction to custom Xen networking

Filed under
HowTos

I've been running Xen for a few weeks now and until now I've been happy with the default networking setup installed. Only when I decided to install Xen upon the server which is hosting this website did I need to explore the way Xen sets up networking.

Xen is pretty good at giving a working network setup for most common cases. By default it sets up virtual instances so they communicate with the network via the host's eth0 device, using NAT.

There are several other supported configurations for the times when this setup isn't appropriate these are:

*bridged networking.
*routed networking.

Each of the available network setups are implemented via a pair of scripts inside the directory /etc/xen/scripts. For example the bridge setup is implemented in the two files:

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