A change, apparently in later FBSD 8.x and in FBSD 9.x, causes usbus[0-n] devices to appear as network devices. They do not show up in ifconfig -a but the do show up in netstat -i. This causes a slowdown and errors at startup when both ifconfig_DEFAULT="DHCP" and synchronous_dhclient="YES" are set in rc.conf: usbus0: not found exiting. Starting Network: usbus0. usbus1: not found exiting. Starting Network: usbus1. etc. This has been mentioned in various places: http://lists.freebsd.org/pipermail/freebsd-current/2011-October/028752.html http://freebsd.1045724.n5.nabble.com/stable-9-usbus-entries-in-network-namespace-td5615804.html http://permalink.gmane.org/gmane.os.freebsd.current/129625 http://freebsd.1045724.n5.nabble.com/Prevent-starting-network-on-usbus-td5142292.html etc. How-To-Repeat: edit /etc/rc.conf and add ifconfig_DEFAULT="DHCP" synchronous_dhclient="YES" restart and observe errors at startup or manually produce the problem by executing /etc/rc.d/netif start usbus0
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