一、前言
需求：由于LVS演练需要，需要配置两张linux OS网卡，而且是不同网段。
准备：
物理机：单网卡
VMware：centos 6.8
二、配置
第一步：新建虚拟机VMware，centos 6.8，默认有一张网卡eth0。配置的NAT模式，如图：
我这里NAT模式设置的网段是192.168.229.0/24网段。
第二步：添加一块网卡。模式为桥接，和物理机网段一样是192.168.1.0/24 网段。如图。
到这里，添加完了。
第三步、配置
Centos开机后，只有一张网卡eth0的信息，拷贝一张eth0的配置文件：
[root@ShiYanLou network-scripts]#cd /etc/sysconfig/network-scripts
[root@ShiYanLou network-scripts]#cp ifcfg-eth0 ifcfg-eth1
修改配置文件ifcfg-eth1：
[root@ShiYanLou network-scripts]# cat /etc/udev/rules.d/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 0x8086:0x100f (e1000)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:df:72:dd", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x8086:0x100f (e1000)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:df:72:e7", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"
可以看到，eth1的mac地址是：00:0c:29:df:72:e7，修改/etc/sysconfig/network-scripts/ifcfg-eth1 成如下：
[root@ShiYanLou network-scripts]# cat ifcfg-eth1
DEVICE=eth1
HWADDR=00:0C:29:DF:72:E7
TYPE=Ethernet
UUID=a5370cfe-c84a-4b11-97ee-a96f34db9bba
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=static
IPADDR=192.168.1.111
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
重启网卡：service Network restart。
[root@ShiYanLou network-scripts]# service network restart
正在关闭接口 eth0： [确定]
正在关闭接口 eth1： [确定]
关闭环回接口： [确定]
弹出环回接口： [确定]
弹出界面 eth0：
正在决定 eth0 的 IP 信息...完成。
[确定]
弹出界面 eth1： Determining if ip address 192.168.1.111 is already in use for device eth1...
[确定]
[root@ShiYanLou network-scripts]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 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:df:72:dd brd ff:ff:ff:ff:ff:ff
inet 192.168.229.133/24 brd 192.168.229.255 scope global eth0
inet6 fe80::20c:29ff:fedf:72dd/64 scope link
valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:df:72:e7 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.111/24 brd 192.168.1.255 scope global eth1
inet6 fe80::20c:29ff:fedf:72e7/64 scope link
valid_lft forever preferred_lft forever
可以看到，两块网卡配置成功。
