ip コマンドで ifconfig/ifdown/ifup 相当のことをするための覚書

概要

ip コマンドの使い方を毎回忘れるので覚書

ifconfig

$ ifconfig
enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.103  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::8993:6c4d:1cb:6e8d  prefixlen 64  scopeid 0x20<link>
        ether 08:00:27:dc:d8:e3  txqueuelen 1000  (Ethernet)
        RX packets 1696  bytes 210497 (205.5 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 822  bytes 90988 (88.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 32  bytes 2592 (2.5 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 32  bytes 2592 (2.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
...

$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:dc:d8:e3 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.103/24 brd 192.168.0.255 scope global noprefixroute dynamic enp0s3
       valid_lft 162574sec preferred_lft 162574sec
    inet6 fe80::8993:6c4d:1cb:6e8d/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
...

ifconfig で特定のデバイスの情報を表示する場合

$ ifconfig enp0s3
enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.103  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::8993:6c4d:1cb:6e8d  prefixlen 64  scopeid 0x20<link>
        ether 08:00:27:dc:d8:e3  txqueuelen 1000  (Ethernet)
        RX packets 1825  bytes 221661 (216.4 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 887  bytes 103090 (100.6 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

$ ip addr show enp0s3
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:dc:d8:e3 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.103/24 brd 192.168.0.255 scope global noprefixroute dynamic enp0s3
       valid_lft 162454sec preferred_lft 162454sec
    inet6 fe80::8993:6c4d:1cb:6e8d/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

ifdown

$ sudo ifdown  enp0s3

$ sudo ip link set enp0s3 down

ifup

$ sudo ifup enp0s3

$ sudo ip link set enp0s3 up

[おまけ] NIC の状態を確認する

$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
    link/ether 08:00:27:dc:d8:e3 brd ff:ff:ff:ff:ff:ff
...