I've recently noticed that I have the following network interfaces setup on my mac:
Ethernet Airport Firewire vmnet1 vmnet8 gif0 stf0
Obviously Ethernet, Airport, and Firewire are enabled by default. I think vmware setup vmnet1 and vmnet8. Where did gif0 and stf0 come from? I'm sure I did not setup these interfaces myself, so now I'm getting paranoid about spyware.
What applications might have automatically setup these interfaces? How do I disable networking through them? Or is this a common setup and I shouldn't worry about it?
/edit: gif0 appears to have the ip address 18.104.22.168 and stf0 appears to have the ip address 22.214.171.124. Neither one of those is even remonetly similar to my actual ip address. What's going on here?
/edit 2: ifconfig reveals that neither interface has the flag "up" so they are not in use. Thanks for the help jjungnickel.