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Security
The chapter describe Fridu reference architecture security model, unfortunatly the way iptables work make a manual step by step operation guide useless, and I make the assumption that user will generate iptables rules automatically, obvisouly script can dump iptables commands allowing anyone to double check what it going one.
Fridu-in-Xen security model is designed to be very simple to administrate. Firewall iptables are generated automatically through a small parser script and the administrator only have 3 rules to handle. This describe how to implemented security before you reach a given VM. Obviously each virtual machine may later have its own set of firewall rules, but this is out of scope of this guide. You should look Fridu-in-Xen security model as the equivalence of what a network/infrastructure team is providing inside a traditional Telco.
Note: Firewall has been extended to support other virtualization environment like OpenVZ or VirtualBox and has now its own page (here)
Just wanted to point out that the two sets of 'Prev - Next' links at the footer of the page are slightly confusing. Maybe the bottom ones should be called 'Older/Newer Article'
BTW, this is a great resource. I will try to understand it and apply it in a similar scenario.
=========> Fulup respond ==============
I agree that having two next/prev link on the same page is confusing :( I kept Joomla default default config, which was not a good idea.
Conclusion: I removed the article/article navigation and kept only the on to browse current article.
Thank you for the TIP.