at: http://people.freebsd.org/~julian/layer2b.pdf I'm going to do one for RELENG_4 by add in the bits added, and then, the big task.. one for -current BTW there is also one for the variant of 4.10 I am using at work.. http://people.freebsd.org/~julian/layer2c.pdf but it's probably not of general interest.