: 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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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. Previously, I had used Amigas since I was years old. Sorry, your blog cannot share posts by email. I hope that there will be at least a persons or so willing to buy the printed version for a reasonable price.

How did you get started with Linux and security? 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. 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. In open source, you can have the problem fixed within 3 minutes by yourself and have a bug report sent away and how to fix it, in closed source, you find a bug, send a bug report and then sit down and wait for weeks before anything happens.

Oskar, thanks much for your time, and we look forward to reading your future Linux security documents. I most definitely think so. 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.

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 throw 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.

Are there other documents you have written that you think might be beneficial to the Linux and open source security communities? For example, I had a conversion error between different types of points leading to my pages being 0. 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. However, a firewall is never near good enough based on only a packet filtering mechanism.


I know the last has already been described by the squid documentation, so it is not high priority right now, however I feel that it should at least be mentioned. I still think the tutorial is aimed at those, but it contains more information today about the advanced functions of netfilter and iptables so it might be fairly well suited for the advanced users as well who might find some interesting reads in the tutorial.

Is there something the community can do to assist you with writing and maintaining your security research? Then there was problems with the size of the cover generated in their own webtoolsetc. Yes, I think there is. I have also started another project on my spare time, to document the iproute2 package and its uses. After this, it is all a matter of keeping those few packages you have installed up to date.

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

New version of iptables and ipsysctl tutorials

What do you feel is the most common Linux system vulnerability? Slackware can be a iptablea hard to do this with, since it has no package system of its own except the old. Security Highlights from Defcon The aim of the iptables-tutorial is to explain iptables in a complete and simple way.

Frozentux Yet another site. Some good examples of what this document will contain oskxr explanations on how the ip command works and the syntax, how all the different options and flags to the command is used and information on how each “subcommand” works.

What are some of the major pitfalls Linux Administrators fall into? When finally installed, erase everything not needed, including the man reader. Currently there are quite a lot of plans. Of course, the tutorial also aims at the security interested people out there and anyone who might be oakar in setting up a local network with Internet access. If you continue to use this site we will assume that you are happy with it. My answer to the first question anrreasson, hence, be that they might do errors due to a lack of documentation.

The fewer packages we have to keep up to date, the less work to maintain and to keep it up and running. 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.


This would not change the fact that the tutorial will be available on the Internet, it will always andressson. Of iptablrs, there are those who don’t report the bugs, and instead start using it to their own advantage for example, hack sites with the bug and so on.

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

Their way of handling this was to allow the book to be published, and then every once in a while when someone ordered a book and paid for itthey all of a sudden cancelled the publication, sent me a note that they did so not explaining whyand so forth.

Please login or register. On the other side, ipttables may be a bad thing for the really hard working administrator who wants to keep his packages up to date by hand, and who does it faster than Red Hat and Debian, for example, updates their packages.

Who are your target audience and why? Both are fairly large, and should be able to help you much much better than I can. As I said iptable, the more I write, the more I find that I want to write about. After some months I had the first version of the tutorial published. 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.

Designed to be Secure Without Fail. What is the most important Linux security technology? Then there is a request by some people that want to know how to make a transparent http proxy with iptables and squid. As it looks now, I want to finish the chapter about how a rule iptable written, and then I want to add a chapter about the state machine.

Oskar Andreasson speaks with LinuxSecurity. Also, a nice firewall will always be handy when it comes to security.

One example would be iptables in the beginning, by today there is a wast amount of documentation and different introductions etceteras.