增加第三个网卡，进入linux，
[root@jia ~]# cd /etc/sysconfig/network-scripts/
[root@jia network-scripts]# ls
ifcfg-eth0 ifdown ifdown-ippp ifdown-post ifdown-sit ifup-aliases ifup-ippp ifup-plip ifup-ppp ifup-tunnel net.hotplug
ifcfg-eth1 ifdown-bnep ifdown-ipv6 ifdown-ppp ifdown-tunnel ifup-bnep ifup-ipv6 ifup-plusb ifup-routes ifup-wireless network-functions
ifcfg-lo ifdown-eth ifdown-isdn ifdown-routes ifup ifup-eth ifup-isdn ifup-post ifup-sit init.ipv6-global network-functions-ipv6
[root@jia network-scripts]# cp ifcfg-eth0 ifcfg-eth2
[root@jia network-scripts]# vi ifcfg-eth2
[root@jia network-scripts]# service network restart
Shutting down interface eth0: [ OK ]
Shutting down interface eth1: [ OK ]
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0:
Determining IP information for eth0... done.
[ OK ]
Bringing up interface eth1:
Determining IP information for eth1... done.
[ OK ]
Bringing up interface eth2:
Determining IP information for eth2... done.
[ OK ]
[root@jia network-scripts]# ifconfig
eth0 Link encap:Ethernet HWaddr 08:00:27:31:84:F8
inet addr:10.0.2.15 Bcast:10.0.2.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe31:84f8/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:51 errors:0 dropped:0 overruns:0 frame:0
TX packets:92 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:6132 (5.9 KiB) TX bytes:7750 (7.5 KiB)
eth1 Link encap:Ethernet HWaddr 08:00:27:C2:E9:84
inet addr:192.168.56.102 Bcast:192.168.56.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fec2:e984/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:883 errors:0 dropped:0 overruns:0 frame:0
TX packets:593 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:81646 (79.7 KiB) TX bytes:98672 (96.3 KiB)
eth2 Link encap:Ethernet HWaddr 08:00:27:1A:50:5D
inet addr:192.168.87.156 Bcast:192.168.87.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe1a:505d/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3773 errors:0 dropped:0 overruns:0 frame:0
TX packets:13 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:227627 (222.2 KiB) TX bytes:1452 (1.4 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:9798 errors:0 dropped:0 overruns:0 frame:0
TX packets:9798 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1758199 (1.6 MiB) TX bytes:1758199 (1.6 MiB)
[root@jia network-scripts]#
修改eth2的参数参考
[root@jia rules.d]# cat 70-persistent-net.rules
# This file was automatically generated by the /lib/udev/write_net_rules
# program, run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single
# line, and change only the value of the NAME= key.
# PCI device 0x8086:0x100e (e1000) (custom name provided by external tool)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="08:00:27:31:84:f8", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x8086:0x100e (e1000) (custom name provided by external tool)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="08:00:27:c2:e9:84", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"
# PCI device 0x8086:0x100e (e1000)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="08:00:27:1a:50:5d", ATTR{type}=="1", KERNEL=="eth*", NAME="eth2"
[root@jia rules.d]#