网络设计概览
宿主 172.25.254.1/24
虚拟机两台：
rhel6.5-2 172.25.254.11/24
servera 172.25.254.10/24
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宿主
[root@localhost network-scripts]# cat ifcfg-br0
DEVICE=br0
TYPE=Bridge
NAME=br0
ONBOOT=yes
BOOTPROTO=none
IPADDR0=172.25.254.1
PREFIX0=24
GATEWAY0=172.25.254.254
DEFROUTE=yes
IPADDR1=172.25.1.250
PREFIX1=24
DNS1=172.25.254.250
PEERDNS=yes
TYPE=Bridge
DEFROUTE=yes
DELAY=0
STP=no
[root@localhost network-scripts]# cat ifcfg-enp4s0f1
TYPE=Ethernet
BOOTPROTO=none
NAME=enp4s0f1
UUID=594f612f-5ef6-4e28-810c-3db501f027d5
DEVICE=enp4s0f1
ONBOOT=yes
BRIDGE=br0
[root@localhost network-scripts]# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.80fa5b09146d no enp4s0f1
vnet0
vnet1
virbr0 8000.5254004cb17a yes virbr0-nic
[root@localhost network-scripts]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 172.25.254.254 0.0.0.0 UG 425 0 0 br0
172.25.1.0 0.0.0.0 255.255.255.0 U 425 0 0 br0
172.25.254.0 0.0.0.0 255.255.255.0 U 425 0 0 br0
192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0
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虚拟机
添加网卡，选择桥接br0 设备型号选择virtio
重新启动虚拟机
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servera
该虚拟机是最小化安装的rhel 6.5，因此没有安装NetworkManager软件服务，只需要配置network服务即可
servera重启之后的ifcfg-eth0配置如下
[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
HWADDR=52:54:00:F7:77:B9
TYPE=Ethernet
UUID=06f58e0b-6dbc-4f12-91f2-ffa3a7b518fc
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=DHCP
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需要由dhcp动态获取ip改成手动的，如下所示：（因为没有dhcp服务器，因此当前没法动态获取ip的，当然如果你会搭建dhcp服务器，就可以通过dhcp获取ip了）
[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
HWADDR=52:54:00:F7:77:B9
TYPE=Ethernet
UUID=06f58e0b-6dbc-4f12-91f2-ffa3a7b518fc
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
IPADDR=172.25.254.10
PREFIX=255.255.255.0
GATEWAY=172.25.254.254
PREFIX=255.255.255.0
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接着重新启动服务即可
service network restart
[root@localhost ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 52:54:00:F7:77:B9
inet addr:172.25.254.10 Bcast:172.25.255.255 Mask:255.255.255.0
inet6 addr: fe80::5054:ff:fef7:77b9/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:400 errors:0 dropped:0 overruns:0 frame:0
TX packets:99 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:68111 (66.5 KiB) TX bytes:12427 (12.1 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:16436 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:684 (684.0 b) TX bytes:684 (684.0 b)
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rhel6.5-2
该虚拟机是图形化界面安装的rhel6.5，管理网络的服务有两个，一个是network，另一个是NetworkManager
因此，我们可以选择一个服务来管理，
第一种方法，使用network服务
首先需要关闭NetworkManager服务
service NetworkManager stop
chkconfig NetworkManager off
reboot
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在kvm图像化界面中删除网卡，重新添加网卡,重启虚拟机
52:54:00:3a:b8:0e
首先通过ip addr查看一下虚拟机网卡名称
[root@localhost ~]# ip addr
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: eth5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 52:54:00:3a:b8:0e brd ff:ff:ff:ff:ff:ff
根据网卡名称eth5，手动创建ifcfg-eth5的配置文件，需要用到添加网卡时分配到的网卡mac地址
[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth5
DEVICE=eth5
HWADDR=52:54:00:3a:b8:0e
TYPE=Ethernet
ONBOOT=yes
BOOTPROTO=none
IPADDR=172.25.254.11
PREFIX=24
GATEWAY=172.25.254.254
PREFIX=24
重新启动服务
service network restart
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第二种方法，使用NetworkManager服务
自己摸索吧 .
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现在可以到宿主机上通过ssh远程登陆了哈！
远程连接rhel6.5-2
[root@localhost ~]# ssh root@172.25.254.11
root@172.25.254.11's password:
Last login: Thu Sep 22 13:27:46 2016 from 172.25.254.1
[root@localhost ~]# exit
logout
Connection to 172.25.254.11 closed.
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远程连接servera
[root@localhost ~]# ssh root@172.25.254.10
root@172.25.254.10's password:
Last login: Thu Sep 22 13:04:49 2016 from 172.25.254.1
[root@localhost ~]# exit
logout
Connection to 172.25.254.10 closed.
[root@localhost ~]#
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你学会了吗？以后应该都能配置了吧 ^ ^