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Greylisting with PF Publish Date: Jan. 18, 2007
Greylisting--delaying mail delivery briefly per the SMTP RFCs--is an effective way to reduce the amount of incoming spam. While many greylisting solutions require customization of your SMTP server, OpenBSD's PF can do it too. Dan Langille shows how to use the powerful packet filter to identify and pass legitimate mail, delay and divert potential spammers, and throw in some OS fingerprinting to ward off certain zombie clients.
Virtualization with FreeBSD Jails Publish Date: Mar. 9, 2006
Consolidating several small machines into one powerful one has advantages in administration and resource usage. It also has implications for security and encapsulation. FreeBSD's jails feature allows you to host multiple separate services on a single machine while keeping them securely separate. Dan Langille shows how.
Monitoring RAID with NetSaint Publish Date: Mar. 17, 2005
Building a RAID array can help you sleep better at night, knowing that if there's a problem, you have a chance to recover your precious data. How do you know when there's a problem, though? Dan Langille demonstrates how to use NetSaint to monitor your RAID setup on FreeBSD.
Implementing Hardware RAID on FreeBSD Publish Date: Dec. 9, 2004
Want better performance, higher reliability, and better recovery possibilities from your disks? Try RAID. Dan Langille recently made the switch to hardware RAID on his FreeBSD box; here's how he did it.
Secure Your Wireless with IPsec Publish Date: Oct. 21, 2004
Wireless can make your life much, much easier, but those pesky radio waves won't stay put. Sometimes this is good, but sometimes you want to lock down your network. WEP and MAC address filtering aren't secure enough. IPsec, the same approach used to secure VPNs, is much better. Dan Langille explains how to configure Wifi with IPsec.
Bacula: Cross-Platform Client-Server Backups Publish Date: Jan. 8, 2004
Bacula may not be the first name that comes to mind when you think of open source backup software. Dan Langille claims it's effective and useful, despite the odd name. He describes configuration and usage across multiple platforms and hardwares.
