OpenBSD's PF packet filter has grown in power and appeal since its introduction in OpenBSD 3.0. With the imminent release of OpenBSD 3.5, Federico Biancuzzi interviewed several leading OpenBSD developers for their thoughts on PF and new features.
Note that I've written most of this document from memory. It appears to be
correct; if I've missed something or if you have any questions or comments,
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Here's my network setup:
An esoteric buffer overflow bug in OpenBSD has been upgraded in importance after it was discovered that, in certain conditions, it could allow a cracker to gain remote access to a server.
The new release provides significant improvements, including new features, in nearly all areas of the system.
Support for OpenBSD (within PHP in particular) has in the past been sketchy, but things appear to be improving now. PHP3 and MySQL are both in the ports tree distributed with OpenBSD 2.7, making installation and configuration a relatively simple process.
OpenBSD 2.7 now ships with complete IPv6 support. In real world terms, this means you could feasibly operate a purely IPv6 network of OpenBSD machines, or have them participate in an IPv6 internetwork.