if you use pppoe(4) for internet, and want to do a remote update from 4.2 to 4.3, over said pppoe(4) link, then the normal update procedure will not work, because the 4.3 kernel and the 4.2 ifconfig binary can not work together.
after rebooting the new 4.3 bsd kernel, the network will not be configure and you will walk/drive to the system (just like I did today). so, brefore rebooting to 4.3, at least unpack the 4.3 ifconfig binary from base43.tgz - Marc
