4. How do I display network interface information on linux?

How do I display network interface information on linux?


  • You can display various network interface information using a command called "ip".

    # ip link show
1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: bond0: <BROADCAST,MULTICAST,MASTER,UP> mtu 1500 qdisc noqueue
    link/ether 00:1e:0b:ea:89:90 brd ff:ff:ff:ff:ff:ff
3: eth0: <BROADCAST,MULTICAST,SLAVE,UP> mtu 1500 qdisc pfifo_fast master bond0 qlen 1000
    link/ether 00:1e:0b:ea:89:90 brd ff:ff:ff:ff:ff:ff
4: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
    link/ether 00:1e:0b:ea:89:88 brd ff:ff:ff:ff:ff:ff
5: eth2: <BROADCAST,MULTICAST,SLAVE,UP> mtu 1500 qdisc pfifo_fast master bond0 qlen 1000
    link/ether 00:1e:0b:ea:89:90 brd ff:ff:ff:ff:ff:ff
6: eth3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
    link/ether 00:1e:0b:91:3d:3e brd ff:ff:ff:ff:ff:ff
7: eth4: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:1a:4b:ff:90:63 brd ff:ff:ff:ff:ff:ff
8: eth5: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:1a:4b:ff:90:64 brd ff:ff:ff:ff:ff:ff
9: sit0: <NOARP> mtu 1480 qdisc noop
    link/sit 0.0.0.0 brd 0.0.0.0

    # ip addr show
1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: bond0: <BROADCAST,MULTICAST,MASTER,UP> mtu 1500 qdisc noqueue
    link/ether 00:1e:0b:ea:89:90 brd ff:ff:ff:ff:ff:ff
    inet 10.83.20.32/24 brd 10.81.18.255 scope global bond0
    inet 10.83.20.40/24 brd 10.81.18.255 scope global secondary bond0:1
    inet 10.83.20.41/24 brd 10.81.18.255 scope global secondary bond0:2
    inet 10.83.20.42/24 brd 10.81.18.255 scope global secondary bond0:3
    inet6 fe80::21e:bff:feea:8990/64 scope link
       valid_lft forever preferred_lft forever
3: eth0: <BROADCAST,MULTICAST,SLAVE,UP> mtu 1500 qdisc pfifo_fast master bond0 qlen 1000
    link/ether 00:1e:0b:ea:89:90 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::21e:bff:feea:8990/64 scope link
       valid_lft forever preferred_lft forever
4: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
    link/ether 00:1e:0b:ea:89:88 brd ff:ff:ff:ff:ff:ff
5: eth2: <BROADCAST,MULTICAST,SLAVE,UP> mtu 1500 qdisc pfifo_fast master bond0 qlen 1000
    link/ether 00:1e:0b:ea:89:90 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::21e:bff:feea:8990/64 scope link
       valid_lft forever preferred_lft forever
6: eth3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
    link/ether 00:1e:0b:91:3d:3e brd ff:ff:ff:ff:ff:ff
7: eth4: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:1a:4b:ff:90:63 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::21a:4bff:feff:9063/64 scope link
       valid_lft forever preferred_lft forever
8: eth5: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:1a:4b:ff:90:64 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::21a:4bff:feff:9064/64 scope link
       valid_lft forever preferred_lft forever
9: sit0: <NOARP> mtu 1480 qdisc noop
    link/sit 0.0.0.0 brd 0.0.0.0

    # ip route show
10.83.20.0/24 dev bond0  proto kernel  scope link  src 10.81.18.32
169.254.0.0/16 dev bond0  scope link
default via 10.83.20.3 dev bond0

    # ip rule show
0:      from all lookup local
32766:  from all lookup main
32767:  from all lookup default

    # ip neigh show
10.83.20.3 dev bond0 lladdr 00:01:64:f9:1a:01 nud reachable
10.83.20.2 dev bond0 lladdr 00:15:2b:3d:cb:34 nud reachable
linux 595
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