Unexpected interfaces in ifconfig
fw0 is the FireWire network interface. It's benign.

stf0 is an IPv6 to IPv4 tunnel interface. It's a bridge connection that exists to help us transition from IPv4 to the IPv6 standard. It's benign. You can read more about it here if you like: http://en.wikipedia.org/wiki/6to4

gif0 is a generic tunnel interface. It's used to tunnel IPv4 traffic to an IPv6 network and back. It's benign. You can read more about it here: http://www.gsp.com/cgi-bin/man.cgi?section=4&amp;topic=gif