配置IP别名辅助IP实践

1. ifconfig

[root@kali ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:0C:29:E2:A0:66
inet addr:192.168.77.128 Bcast:192.168.77.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fee2:a066/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:18013 errors:0 dropped:0 overruns:0 frame:0
TX packets:1514 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1163089 (1.1 MiB) TX bytes:163548 (159.7 KiB)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host

2. 只查看指定的网卡信息

[root@kali ~]# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:0C:29:E2:A0:66
inet addr:192.168.77.128 Bcast:192.168.77.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fee2:a066/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:18172 errors:0 dropped:0 overruns:0 frame:0
TX packets:1536 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1173747 (1.1 MiB) TX bytes:166486 (162.5 KiB)

3. 给eth0网卡在配一个ip地址

[root@kali ~]# ifconfig eth0:1 192.168.77.200/24 up
[root@kali ~]# ifconfig

4. 删除临时IP

[root@kali ~]# ifconfig eth0:1 del 192.168.77.200
[root@kali ~]# ifconfig


小结：
临时IP只要网卡或者服务器重启，这些信息都会失效。停掉辅助IP还可以使用 ifconfig eth0:1 down这个命令。要想配置的别名永久生效，需要配置文件 （/etc/sysconfig/network-scripts/ifcfg-eth0:1）。