ipコマンド

参考

• Network Configuration (日本語) - ArchWiki
• Linux Set Up Routing with ip Command
• iprouteパッケージに入っています。

よく使う

固定IP

ip addr add 10.0.2.15/24 dev eth0

デフォルトゲートウェイ

ip route add default via 10.0.2.2

ルーティング確認

route -n

RTNETLINK answers: File existsが出る場合

• 一度ネットワーク設定を飛ばせば解決した。"RTNETLINK answers: File exists"を解消する - R42日記

ip addr flush dev eth0

ルーティング追加

ルーティング追加

ip route add 210.210.210.222 dev eth0

IP表示

IP表示

ip -f inet addr

出力例

1.ipアドレス表示

# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    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 08:00:27:1c:cf:2b brd ff:ff:ff:ff:ff:ff
    inet 10.0.2.15/24 brd 10.0.2.255 scope global eth0
    inet6 fe80::a00:27ff:fe1c:cf2b/64 scope link 
       valid_lft forever preferred_lft forever

# ip link show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
    link/ether 08:00:27:1c:cf:2b brd ff:ff:ff:ff:ff:ff

2. 1の情報少ない版

# ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT 
    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 08:00:27:1c:cf:2b brd ff:ff:ff:ff:ff:ff

3.ARPテーブル表示

# ip neigh
10.0.2.2 dev eth0 lladdr 52:54:10:12:45:02 REACHABLE

4.ルーティング表示

# ip route
default via 10.0.2.2 dev eth0 
10.0.2.0/24 dev eth0  proto kernel  scope link  src 10.0.2.15

5.コネクション先の履歴？

# ip tcp_metrics | sort | more
207.200.74.27 age 2630.104sec rtt 99500us rttvar 93000us cwnd 10
...

6.ARPテーブルのモニタリング？

# ip monitor

7.help

helpをつけるとコマンドのオプションが表示されます。

$ ip link help
Usage: ip link add [link DEV] [ name ] NAME
                   [ txqueuelen PACKETS ]
                   [ address LLADDR ]
                   [ broadcast LLADDR ]
                   [ mtu MTU ]
                   [ numtxqueues QUEUE_COUNT ]
                   [ numrxqueues QUEUE_COUNT ]
                   type TYPE [ ARGS ]
       ip link delete DEV type TYPE [ ARGS ]

       ip link set { dev DEVICE | group DEVGROUP } [ { up | down } ]
                      [ arp { on | off } ]
                      [ dynamic { on | off } ]
                      [ multicast { on | off } ]
                      [ allmulticast { on | off } ]
                      [ promisc { on | off } ]
                      [ trailers { on | off } ]
                      [ txqueuelen PACKETS ]
                      [ name NEWNAME ]
                      [ address LLADDR ]
                      [ broadcast LLADDR ]
                      [ mtu MTU ]
                      [ netns PID ]
                      [ netns NAME ]
              [ alias NAME ]
                      [ vf NUM [ mac LLADDR ]
                   [ vlan VLANID [ qos VLAN-QOS ] ]
                   [ rate TXRATE ] ] 
                   [ spoofchk { on | off} ] ] 
              [ master DEVICE ]
              [ nomaster ]
       ip link show [ DEVICE | group GROUP ]

TYPE := { vlan | veth | vcan | dummy | ifb | macvlan | can | bridge | ipoib }