CentOS增加新IP/单网卡绑定多IP

时间:2016-05-30 15:10 来源:linux.it.net.cn 作者:IT

因为公网线路需要更换IP地址，在过渡期间可以二个IP地址同时使用，为此需要为单个网卡绑定二个IP地址。
(1)增加新IP地址。为了以后删除旧IP地址方便，直接将eth1的IP改为新IP，并重新将eth1:1接口为旧IP地址。

				[root@web network-scripts]# pwd

				/etc/sysconfig/network-scripts

				[root@web network-scripts]# cp ifcfg-eth1 ifcfg-eth1:1

				[root@web network-scripts]# vi ifcfg-eth1:1

				DEVICE=eth1:1

				###GATEWAY=211.151.92.17

				[root@web network-scripts]# vi ifcfg-eth1

				IPADDR=121.52.160.29

				GATEWAY=121.52.160.17

(2)重新启动网络，并查看新网络配置

				[root@web network-scripts]# /etc/init.d/network restart

				[root@web network-scripts]# ifconfig eth1

				eth1      Link encap:Ethernet  HWaddr 00:1E:4F:37:40:6F  

				          inet addr:121.52.160.29  Bcast:121.52.160.31  Mask:255.255.255.240

				          inet6 addr: fe80::21e:4fff:fe37:406f/64 Scope:Link

				          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

				          RX packets:11468 errors:0 dropped:0 overruns:0 frame:0

				          TX packets:17259 errors:0 dropped:0 overruns:0 carrier:0

				          collisions:0 txqueuelen:1000 

				          RX bytes:1037939 (1013.6 KiB)  TX bytes:19258257 (18.3 MiB)

				          Interrupt:16 Memory:f4000000-f4012100 

				[root@web network-scripts]# ifconfig eth1:1

				eth1:1    Link encap:Ethernet  HWaddr 00:1E:4F:37:40:6F  

				          inet addr:211.151.92.29  Bcast:211.151.92.31  Mask:255.255.255.240

				          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

				          Interrupt:16 Memory:f4000000-f4012100 

				[root@web network-scripts]# netstat -nr

				Kernel IP routing table

				Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface

				211.151.92.16   0.0.0.0         255.255.255.240 U         0 0          0 eth1

				121.52.160.16   0.0.0.0         255.255.255.240 U         0 0          0 eth1

				166.111.120.0   0.0.0.0         255.255.255.0   U         0 0          0 eth0

				192.168.122.0   0.0.0.0         255.255.255.0   U         0 0          0 virbr0

				166.111.0.0     166.111.120.1   255.255.0.0     UG        0 0          0 eth0

				169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth1

				0.0.0.0         121.52.160.17   0.0.0.0         UG        0 0          0 eth1

(3)修改策略路由脚本。

				/sbin/ip route add 0/0 via 121.52.160.17 table 120

				/sbin/ip rule add from 121.52.160.29 table 120 pref 100

(责任编辑：IT)