Custom Network Scripts
You might be thinking at this point that it's overkill to specify a configuration script in the Xen config file rather than simply selecting among built-in options. Take our word for it: The ability to specify your own network script is fantastically useful. Because Xen's networking is built on standard tools, the scripts are easy to understand and tailor to your particular needs.
The easiest way to do this, and a sufficient method for most configurations, is to create a small wrapper script that calls the standard Xen scripts with appropriate arguments. You can also modify the standard scripts to source additional functions and call those as necessary—for example, to modify firewall rules or attach monitoring scripts.
Multiple-Bridge ...
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