Hi dusto,
I replied this option in another thread, see if it works for you: [url]http://fogproject.org/forum/threads/request-dnsmasq-fails-to-start.4457/#post-12837[/url]
I assume that when you say you can’t modify any of the network resources to use PXE you mean that you can’t modify DHCP options 66 & 67. In my enterprise there is a DHCP which has those options already busy, so I couldn’t modify them, my solution was to use ProxyDHCP as I mention in the thread above.
Tell me if this works for you.