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Securing Small Networks with OpenBSD

Small networks are often more vulnerable than large ones because they lack the money to implement good security. Jacek Artymiak explains how to secure a small network on a tight budget
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Changes in pf: Packet Filtering
OpenBSD's packet filter has really grown up. Since its introduction in OpenBSD 3.0, it's become an advanced tool for networking and security. In the third of four articles, Jacek Artymiak explores new options for packet filtering with pf in OpenBSD 3.2, after NAT and redirection have taken place. Jun. 26, 2003

Changes in pf: More on NAT
OpenBSD's packet filter has really grown up. Since its introduction in OpenBSD 3.0, it has become an advanced tool for networking and security. In the second of four articles, Jacek Artymiak presents a sample NAT and DMZ ruleset that is easily customized. May. 8, 2003

NAT with pf
OpenBSD's packet filter has really grown up. Since its introduction in OpenBSD 3.0, it has become an advanced tool for networking and security. In the first of four articles, Jacek Artymiak examines recent updates to pf. This week, he looks at Network Address Translation. Mar. 6, 2003

Patching OpenBSD
The nice thing about software is that you can patch it to fix problems. The tricky thing about software is that you have to patch it to fix problems. Your systems are only as secure as your patching strategy allows. Jacek Artymiak explains how to apply patches to your OpenBSD machines. Jan. 16, 2003

Downloading Files from Behind the Firewall
Securing your network often means saying "no" to some user requests and "try this instead" to others. Instead of punching holes in your firewall, can you educate your users to use better tools? Jacek Artymiak describes effective downloading utilities, and strategies to promote them. Dec. 19, 2002

TRUSTSECURE 2002 Report
TRUSTSECURE 2002, the Polish IT security conference, brought together some of the brightest minds in security today. Jacek Artymiak was there. In the latest installment of his Securing Small Networks with OpenBSD column, he summarizes the highlights and puts on his prediction hat. Nov. 14, 2002

Simple Things to Improve Your System's Security
Jacek Artymiak returns with a grab bag of simple ways to enhance the security of your system. These techniques apply to OpenBSD in specific, the BSDs in general, and most Unixes. Oct. 31, 2002

Managing Advanced PF Logs
Jacek Artymaik shows us how to implement a Perl script that reads pf logs from the pflog fifo pipe, archives logs on the monitoring firewall, and sends them to another fifo pipe so that log analysis software can pick them up for analysis. Aug. 22, 2002

Securing Remote PF Firewall Logs
Jacek Artymiak shows us how to improve the security of remotely logged firewall logs and how to calculate how much storage space we need to keep a reasonable amount of logs for convenient analysis. Aug. 8, 2002

Archiving PF Firewall Logs
Jacek Artymiak tackles automating the transfer of logs from the firewall to one of the workstations connected to the internal private network segment. Jul. 25, 2002

Securing Small Networks with OpenBSD, Part 5
On a busy network, your firewall logs could quickly fill up your hard drive or be deleted by log file rotations. Jacek Artymiak shows how not to let this happen. Jun. 20, 2002

Securing Small Networks with OpenBSD, Part 4
Jacek Artymiak covers pf log file analysis. Jun. 6, 2002

Securing Small Networks With OpenBSD, Part 3
In the third installment of our series on OpenBSD networking, Jacek Artymiak examines pf rules and potential sendmail problems. Apr. 25, 2002

Securing Small Networks With OpenBSD, Part 2
OpenBSD switched from using IPFilter as its default firewall to PF, or Packet Filter, as the new default. Jacek Artymiak explains how to make a smooth transition from ipf to pf.  Apr. 11, 2002

Securing Small Networks with OpenBSD, Part 1
Small networks are often more vulnerable than large ones because they lack the money to implement good security. Artymiak Jacek explains how to secure a small network on a tight budget. Feb. 28, 2002




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