OpenBSD pfsync protocol change between 4.3 and 4.4

This doesn't appear to be well advertised, but there are some protocol changes in pfsync between OpenBSD 4.3 and 4.4 that make them not able to talk to each other.

https://kerneltrap.org/mailarchive/openbsd-misc/2008/12/4/4311914

If you're doing staggered upgrades of firewalls like I did, this might burn you.

"Low Tech Hacking"

At times, I've been known to rage against "authority" figures and rules, generally minor stuff like speeding, etc. Somewhat related, I enjoy discovering or hearing/reading of others discovering ways of defeating high-tech devices, particularly when the means of defeat is a notably low tech method.

Not to rant too much, but speed/stop light cameras serve only to produce revenue for the city/county/state entitity, they don't save lives in any fashion. I've always been curious about means of defeating the cameras, with super-reflective license plate spray or similar. This one is certainly high on my list of cleverly low tech:

http://gizmodo.com/5069422/the-muppets-animal-caught-speeding-driving-police-crazy

Genius.