In the middle of installing a tool called mrtg, I bailed out from a perl script to set various configuration parameters for use of snmp because it became clear that I had no idea what I was doing. I also explored some snmp commands myself, but didn't keep a record, unfortunately.
I come back to ifconfig and notice it shows three new interfaces (not there just before the previous adventure):
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280 stf0: flags=0<> mtu 1280 fw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 4078 lladdr 60:fb:42:ff:fe:f4:cd:9e media: autoselect <full-duplex> status: inactive
My laptop on the same LAN has a different new interface called p2p0 that I hadn't noticed before, as well as gif0 and stf0 but not fw0.
After I reset my Airport Extreme to factory default, and reinstalled OS X Lion on my machine, with a wiped disk, they are still there. This:
sudo ifconfig gif0 destroy
makes gif0 go away, but on reboot it comes back. There is a previous answer with some info but what I'd like to know is why are they still there despite a clean install, could they be a security risk, and should I or can I make them go away. Should I be looking at the Airport or something in my StartupItems?
UPDATE: Does my machine set these up at boot or does the Airport remember them? And in either case, why didn't a clean install (or factory reset) restore them to the previous configuration?