1、ifconfig看不到新网卡：
[root@drbd2 ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:0C:29:38:DD:03
inet addr:192.168.1.107 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe38:dd03/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1199 errors:0 dropped:0 overruns:0 frame:0
TX packets:252 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:125240 (122.3 KiB) TX bytes:42908 (41.9 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:45 errors:0 dropped:0 overruns:0 frame:0
TX packets:45 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:5945 (5.8 KiB) TX bytes:5945 (5.8 KiB)
2、ip addr可以看到新网卡eth1，记录mac地址：
[root@drbd2 ~]# 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 00:0c:29:38:dd:03 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.107/24 brd 192.168.1.255 scope global eth0
inet6 fe80::20c:29ff:fe38:dd03/64 scope link
valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
link/ether 00:0c:29:38:dd:0d brd ff:ff:ff:ff:ff:ff
3、拷贝eth0配置文件威eth1，并且更改mac地址、IP地址等：
[root@drbd2 ~]# cd /etc/sysconfig/network-scripts/
[root@drbd2 network-scripts]# cp ifcfg-eth0 ifcfg-eth1
[root@drbd2 network-scripts]# vi ifcfg-eth
ifcfg-eth0 ifcfg-eth1
[root@drbd2 network-scripts]# vi ifcfg-eth1
DEVICE="eth1"
BOOTPROTO="static"
BROADCAST="192.168.136.255"
HWADDR="00:0c:29:38:dd:0d"
IPADDR="192.168.136.7"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
NETMASK="255.255.255.0"
NM_CONTROLLED="yes"
ONBOOT="yes"
TYPE="Ethernet"
4、重启网卡并用ifconfig进行验证。
[root@drbd2 network-scripts]# /etc/init.d/network restart
正在关闭接口 eth0： [确定]
关闭环回接口： [确定]
弹出环回接口： [确定]
弹出界面 eth0： Determining if ip address 192.168.1.107 is already in use for device eth0...
[确定]
弹出界面 eth1： Determining if ip address 192.168.136.7 is already in use for device eth1...
[确定]
[root@drbd2 network-scripts]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:0C:29:38:DD:03
inet addr:192.168.1.107 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe38:dd03/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:10873 errors:0 dropped:0 overruns:0 frame:0
TX packets:1983 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1097307 (1.0 MiB) TX bytes:328774 (321.0 KiB)
eth1 Link encap:Ethernet HWaddr 00:0C:29:38:DD:0D
inet addr:192.168.136.7 Bcast:192.168.136.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe38:dd0d/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:12 errors:0 dropped:0 overruns:0 frame:0
TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:720 (720.0 b) TX bytes:828 (828.0 b)
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:155 errors:0 dropped:0 overruns:0 frame:0
TX packets:155 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:43225 (42.2 KiB) TX bytes:43225 (42.2 KiB)
centos6.9虚拟机识别不了新网卡
原文：http://blog.51cto.com/net881004/2125682
