1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: sit0: <NOARP> mtu 1480 qdisc noop link/sit
3: eth0: <BROADCAST,MULTICAST,ALLMULTI,UP> mtu 1500 qdisc pfifo_fast qlen 100 link/ether fe:fd:d4:0d:d0:73 brd ff:ff:ff:ff:ff:ff
As is the case with the output of ifconfig, you are shown the hardware address, MTU, and interface flags. The qdisc entry refers to the queue (or buffer) that is associated with any traffic that is sent over the interface.
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