pfstat

• read man pages pfstat(8) and pfstatd(8)
  
• on OpenBSD there is a port in net/pfstat
  
• on FreeBSD there is a port in sysutils/pfstat
  
• on NetBSD there is a package in sysutils/pfstat
  
• on DragonFlyBSD there is a package in sysutils/pfstat
  
• or download the most recent source pfstat-2.5.tar.gz (MD5 0360d823e3a349709cd645e838d53d79)
  

The graphs below were produced for a 1 gbps symmetric link using the configuration pfstat.conf.

Also check out Willem Dijkstra's symon, which can gather the same pf statistics (and many other values like cpu load, memory usage, network traffic) with a small monitoring probe and send them to a central server that stores them in an RRDtool database, from which similar graphs can be generated, with many more powerful options.

interface em1 pass bytes ipv4, states

states inserts, removals, searches

interface em1 pass/block packets ipv4

global counters