網絡配置工具
ip命令 用來顯示或操縱Linux主機的路由、網絡設備、策略路由和隧道，是Linux下較新的功能強大的網絡配置工具。
ip(選項)(參數)
Usage: ip [ OPTIONS ] OBJECT { COMMAND | help }
ip [ -force ] -batch filenameOBJECT := { link | address | addrlabel | route | rule | neigh | ntable |
tunnel | tuntap | maddress | mroute | mrule | monitor | xfrm |
netns | l2tp | macsec | tcp_metrics | token }
-V：顯示指令版本信息；
-s：輸出更詳細的信息；
-f：強制使用指定的協議族；
-4：指定使用的網絡層協議是IPv4協議；
-6：指定使用的網絡層協議是IPv6協議；
-0：輸出信息每條記錄輸出一行，即使內容較多也不換行顯示；
-r：顯示主機時，不使用IP地址，而使用主機的域名。OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |
-h[uman-readable] | -iec |
-f[amily] { inet | inet6 | ipx | dnet | bridge | link } |
-4 | -6 | -I | -D | -B | -0 |
-l[oops] { maximum-addr-flush-attempts } |
-o[neline] | -t[imestamp] | -ts[hort] | -b[atch] [filename] |
-rc[vbuf] [size] | -n[etns] name | -a[ll] }
網絡對象：指定要管理的網絡對象；
具體操作：對指定的網絡對象完成具體操作；
help：顯示網絡對象支持的操作命令的幫助信息。ip link show # 顯示網絡接口信息
ip link set eth0 upi # 開啟網卡
ip link set eth0 down # 關閉網卡
ip link set eth0 promisc on # 開啟網卡的混合模式
ip link set eth0 promisc offi # 關閉網卡的混個模式
ip link set eth0 txqueuelen 1200 # 設置網卡隊列長度
ip link set eth0 mtu 1400 # 設置網卡最大傳輸單元
ip addr show # 顯示網卡IP信息
ip addr add 192.168.0.1/24 dev eth0 # 設置eth0網卡IP地址192.168.0.1
ip addr del 192.168.0.1/24 dev eth0 # 刪除eth0網卡IP地址
ip route show # 顯示系統路由
ip route add default via 192.168.1.254 # 設置系統默認路由
ip route list # 查看路由信息
ip route add 192.168.4.0/24 via 192.168.0.254 dev eth0 # 設置192.168.4.0網段的網關為192.168.0.254,數據走eth0接口
ip route add default via 192.168.0.254 dev eth0 # 設置默認網關為192.168.0.254
ip route del 192.168.4.0/24 # 刪除192.168.4.0網段的網關
ip route del default # 刪除默認路由
ip route delete 192.168.1.0/24 dev eth0 # 刪除路由用ip命令顯示網絡設備的運行狀態
[root@localhost ~]# ip link list
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
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 qlen 1000
link/ether 00:16:3e:00:1e:51 brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:16:3e:00:1e:52 brd ff:ff:ff:ff:ff:ff顯示更加詳細的設備信息
[root@localhost ~]# ip -s link list
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
RX: bytes packets errors dropped overrun mcast
5082831 56145 0 0 0 0
TX: bytes packets errors dropped carrier collsns
5082831 56145 0 0 0 0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:16:3e:00:1e:51 brd ff:ff:ff:ff:ff:ff
RX: bytes packets errors dropped overrun mcast
3641655380 62027099 0 0 0 0
TX: bytes packets errors dropped carrier collsns
6155236 89160 0 0 0 0
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:16:3e:00:1e:52 brd ff:ff:ff:ff:ff:ff
RX: bytes packets errors dropped overrun mcast
2562136822 488237847 0 0 0 0
TX: bytes packets errors dropped carrier collsns
3486617396 9691081 0 0 0 0 顯示核心路由表
[root@localhost ~]# ip route list
112.124.12.0/22 dev eth1 proto kernel scope link src 112.124.15.130
10.160.0.0/20 dev eth0 proto kernel scope link src 10.160.7.81
192.168.0.0/16 via 10.160.15.247 dev eth0
172.16.0.0/12 via 10.160.15.247 dev eth0
10.0.0.0/8 via 10.160.15.247 dev eth0
default via 112.124.15.247 dev eth1顯示鄰居表
[root@localhost ~]# ip neigh list
112.124.15.247 dev eth1 lladdr 00:00:0c:9f:f3:88 REACHABLE
10.160.15.247 dev eth0 lladdr 00:00:0c:9f:f2:c0 STALE獲取主機所有網絡接口
ip link | grep ^[0-9] | awk -F: '{print $2}'
