Firewall Builder: Convert Linux Iptables Configuration to OpenBSD and PF

Posted on in Categories Iptables, Linux, OpenBSD, Security last updated March 25, 2009

Lets see how much effort it is going to take to convert this configuration to entirely different firewall platform – PF on OpenBSD. There are different ways to do this. I could make a copy of each member firewall (linux-test-1 and linux-test-2), set platform and host OS in the copy to PF and OpenBSD and then create new cluster object. This would be a sensible way because it preserves old objects which helps to roll back in case something does not work out. However, to make the explanation shorter, I am going to make the changes in place by modifying existing objects.

apt-p2p: How To Upgrade Ubuntu 8.10 Using BitTorrent [ Intrepid Ibex ]

Posted on in Categories GNU/Open source, Howto, Links, Linux, Linux desktop, Linux distribution, Ubuntu Linux last updated October 30, 2008

Today Ubuntu Linux 8.10 final will be released to all mirrors world wild. However, FTP/HTTP mirrors server may down due to heavy demands from users. You can now use BitTorrent to upgrade Ubuntu Linux to 8.10 from old 8.04 version. Help Ubuntu project to spread Linux to humanity.
In the past, the update servers would crash very quickly on a big release day, making it hard for people to get the latest update. With BitTorrent, however, this can be easily avoided.

Understanding Linux networking stack ~ from sockets to device drivers

Posted on in Categories Beyond nixCraft, Howto, Linux, Networking last updated August 13, 2007

Read from sockets to device drivers Linux networking stack:

One of the greatest features of the Linux operating system is its networking stack. It was initially a derivative of the BSD stack and is well organized with a clean set of interfaces. Its interfaces range from the protocol agnostics, such as the common sockets layer interface or the device layer, to the specific interfaces of the individual networking protocols. This article explores the structure of the Linux networking stack from the perspective of its layers and also examines some of its major structures.

Understanding Linux networking stack ~ from sockets to device drivers
Anatomy of the Linux networking stack