May 20, 2020

: Why did you decide to write the iptables reference? Oskar Andreasson: When I started using Linux I noticed a huge black hole in the. More information about Oskar Andreasson and his/her books listed in FreeTechBooks. Iptables Tutorial – Linux Firewall Configuration. Post date: 22 Aug. Oskar Andreasson [email protected] by Oskar Andreasson. Copyright © .. 1. txt.

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Another example that I have noticed is the iproute2 package, which in my way of seeing things is one of the most complex and hardest to understand packages for Linux that is available today. How did you get started with Linux and security? At the beginning, I can’t say I liked it. I oskaf think there is a single most common Linux system vulnerability, and it will definitely not stop a determined attacker. However, I don’t plan to get this project really moving until the iptables tutorial has stabilized, in perhaps months.

New version of iptables and ipsysctl tutorials []

If so, I think it’s worth printing a series. The tutorial was under heavy scrutiny and updating, as can be seen in the latest version of the tutorial. I would suggest at least installing a NIDS i.

During the time, I was also doing a lot of “work” for our site www. Open source gives everyone the chance to look at the source code, and it becomes easier to spot errors for a third party, and hence report to the producer.

To leave packages such as these without documentation makes people go away and start using other operating systems such as Windows. What I hope that this tutorial do, is that it gives people new knowledge about the Linux firewalling possibilities, how they work, and a general knowledge of how to set it up properly. One of the long-term goals of this project is actually to print a book of the whole tutorial and sell to the readers who liked the tutorial.

If you continue to use this site we will assume that you are happy with it. I most definitely think so. By that time, I went up to the second or third step on the ladder to becoming a “Linux Guru” I got saved from the Windows hell and started preachingand I think I’m still stuck somewhere around there.


Sure, there was the howtos written by Rusty Russell and the man page. It was available in bookform from Lulu. These errors might be unknown to the Linux administrator for a long time and, in the long run they may notice the error to late.

Oskar Andreasson IP Tables Tutorial – The Community’s Center for Security

The iptables-tutorial is currently rather stable, and contains information on all the currently available matches and targets in kernelas well as andreassoh couple of complete example scripts and explanations. This is about the same size as the iptables tutorial, but is elementary and guides a total new user to Linux through their first experience. Anyway, my aims aandreasson this documentation is to get more people to understand the extremely advanced routing functionalities that really are part of Linux.

Some good examples of what this document will contain is explanations on how the ip command works and the syntax, how all the different options and sndreasson to the command is used and information on how each “subcommand” works. The first time around I never got it to install at all. I think that this project will look a lot like the iptables tutorial when it gets going, especially in writing style and how it will be built up with a lot of examples among other things.


What do you feel is the most common Linux system vulnerability? However, the percentage of users doing the latter is a dwindling small amount of people, I think. Why did you decide to write the iptables reference? One of the main problems of Linux today is in my way of seeing things, that there is a huge lack of documentation, especially when you start digging into the deeper aspects of Linux.

If there is any Swedish speaking people, I suggest them to check out http: Also, some commands and functions are clearly not documented enough. Any kind of computer would suffice, even Pentiums at the moment, as long as I can have a few network cards with them 9 or so, but less would suffice too.

New version of iptables and ipsysctl tutorials

I believe that this course may actually hold a lot of interest even for the Linux zealots out there who may not have a lot of experience with the console of Linux. The aim of the iptables-tutorial is to explain iptables in a complete and simple way.


Is there something the community can do to assist you with writing and maintaining your security research? This would not change the fact that the tutorial will be available on the Internet, it will always be. This site uses cookies. In his document, he discusses such topics the basics of configuring the kernel, configuring Red Hat to prepare for using IP Tables, a basic description of oskqr iptables command, a number of great firewall examples, and more.

Closed source on the other hand is harder to debug for a third party, and if you really do find a bug, you are more likely to just anxreasson the bug on the crap pile and hope for it to be fixed in the next release, they don’t feel anything in common for the actual development of the product nor do they actually have a good reason for telling the developers about the bug.

Oskar, thanks much for your time, and we look forward to reading your future Linux security documents. Are there other documents you have written that you think might be beneficial to the Linux and open source security communities? If anyone living in Sweden Stockholm knows about a party of computers of any type that some company or private person is willing to give away, either as junk, or just as a contribution, I will owe them extremely much. Both are fairly large, and should be able to help you much much better than I can.

I hope that the iptables-tutorial give Linux administrators the possibility to easily learn about netfilter and iptables and in an as complete document oxkar possible.

How can your iptables reference help to avoid these problems? However, I haven’t gotten very far so far since I have run into problems with the whole deal.