Life is ...

ip

アドレス操作

  • デバイスに対するバインド状態を出力

    # ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    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: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:5f:94:78 brd ff:ff:ff:ff:ff:ff
    inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic eth0
       valid_lft 86096sec preferred_lft 86096sec
    inet6 fe80::5054:ff:fe5f:9478/64 scope link
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 08:00:27:06:e6:9e brd ff:ff:ff:ff:ff:ff
    inet 192.168.33.10/24 brd 192.168.33.255 scope global eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fe06:e69e/64 scope link
       valid_lft forever preferred_lft forever

  • 192.168.0.10 を eth0 のエイリアス(eth0:1)として追加する

    • nmcli を利用しましょう

      # ip addr add local 192.168.0.10/24 dev eth0 label eth0:1

  • 192.168.0.10 の eth0 のエイリアス(eth0:1)を削除する

    • nmcli を利用しましょう

      # ip addr del local 192.168.0.10/24 dev eth0 label eth0:1

近隣キャッシュ操作

  • ARP テーブルの状態表示

    # ip neigh show
10.0.2.2 dev eth0 lladdr 52:54:00:12:35:02 REACHABLE
10.0.2.3 dev eth0 lladdr 52:54:00:12:35:03 STALE
    • REACHABLE
      • 到達可能
    • STALE
      • 失効状態
    • DELAY
      • 猶予期間中
    • PERMANENT
      • 永続的設定

デバイス操作

  • 状態表示

    # ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
    link/ether 52:54:00:5f:94:78 brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
    link/ether 08:00:27:06:e6:9e brd ff:ff:ff:ff:ff:ff

  • 統計情報の表示

    # ip -s link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    RX: bytes  packets  errors  dropped overrun mcast
    0          0        0       0       0       0
    TX: bytes  packets  errors  dropped carrier collsns
    0          0        0       0       0       0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
    link/ether 52:54:00:5f:94:78 brd ff:ff:ff:ff:ff:ff
    RX: bytes  packets  errors  dropped overrun mcast
    190526     1505     0       0       0       0
    TX: bytes  packets  errors  dropped carrier collsns
    127639     962      0       0       0       0
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
    link/ether 08:00:27:06:e6:9e brd ff:ff:ff:ff:ff:ff
    RX: bytes  packets  errors  dropped overrun mcast
    1180       2        0       0       0       0
    TX: bytes  packets  errors  dropped carrier collsns
    1984       18       0       0       0       0

  • ルーティングテーブルの確認

    # ip route show
default via 10.0.0.1 dev eth0 proto static metric 100
10.0.0.0/8 dev eth0 proto kernel scope link src 10.0.12.10 metric 100