What are the different internet connection types used by ifconfig and ipconfig?
-
07-02-2021 - |
Question
Typing ifconfig
on the command line gives me listings for several devices. I've seen at least the following ones:
lo0
gif0
stf0
en0
en1
en2
en3
p2p0
awdl0
bridge0
What specifically do each of them refer to? I know en0
is a wireless connection, en3
is a connection using a Thunderbolt-to-ethernet adapter, and en1
is an ordinary ethernet connection. What about the rest?
Solution
These are properly known as BSD names, so you can look at the BSD / Darwin source code to see what these mean.
en
is Ethernetlo
is loop back or local hostawdl
is air drop peer to peer (a type of mesh network)bridge
is a connection between networksp2p
is sometimes a virtualization link and also some people have reported it being used with AirDrop before that changed to beawdl0
The numbers added to the end just increment as you add a second interface of the same type. The rest are tunneling interfaces for VPN and bridging between IPv4 and IPv6:
- see Ian's answer on question Unexpected interfaces in ifconfig
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