Short answer: You can't.
Long answer: As you stated, both are operating systems (AstLinux is 
Linux, m0n0wall FreeBSD). You could install them parallel on one machine 
and boot one or the other with a boot manager, but I assume that this is 
not what you want.

Greetings
Carsten Holbach



Andy Prokop schrieb:
> We are using AstLinux, and would like to use the full version of m0n0wall on
> AstLinux. From everything I have read; m0n0wall is a standalone OS and
> application firewall, as is AstLinux is OS and PBX. How could I install
> m0n0wall on an existing AstLinux server??
>  
> Andy