OpenBSD 4.6 is here!
by George T on Oct 19 2009 at 17:36 
3
We knew it was coming. OpenBSD 4.6 is now available with lots of new features. Except for the several improved hardware support and other improvements, this release includes a few worth-mentioning improvements concerning the pf (Packet Filter), a default system’s software aka one of the most advanced firewall software.
- Enabled pf by default in the rc.conf.
- Removed pf scrub rules, and only do one kind of packet reassembly. Rulesets with scrub rules need to be modified because of this.
- Regular rules can now have per-rule scrub options.
- Added new “match” keyword which only applies rule options but does not change the current pass/block state.
- Make all pf operations transactional to improve atomicity of reloads.
- Stricter pf checking for ICMP and ICMPv6 packets.
- Various improvements to pfsync to lower sync traffic bandwidth and optionally allow active-active firewall setups.
- Fix pf scrub max-mss for IPv6 traffic.
You can find more details about all the new features shipping with this release here.
Last but not least, as Jeremy S. Anderson said:
tags: lsd, open source, openbsd, operating systems, packet filter, pf, security, unixThere are two major products that come out of Berkeley: LSD and UNIX. We don’t believe this to be a coincidence.
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I have done many Openbsd installation, and for me the openBSD 4.6 is the most easiest one to install. I like this one a lot.