The recent OpenBSD 5.0 pre-release announcement on undeadly notes that ALTQ is being replaced by new priority settings. This should make it to DragonFly at some point, since pf in DragonFly has been catching up to the current version of pf in OpenBSD, thanks to the efforts of Jan Lentfer…
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I think an NPF port should be investigated. Config is very similar to PF but unlike PF it scales.