xen4.4.2网络配置
xen4.4.2安装完成后我们观察到以下信息：Dom0：
#ifconfig
eth0 Link encap:EthernetHWaddr 00:0C:29:2E:72:81
inet addr:10.43.2.11Bcast:10.43.2.255Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe2e:7281/64 Scope:Link
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:3882 errors:0 dropped:0 overruns:0 frame:0
TX packets:61 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:431458 (421.3 KiB)TX bytes:7243 (7.0 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNINGMTU:65536Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b)TX bytes:0 (0.0 b)
virbr0 Link encap:EthernetHWaddr FE:FF:FF:FF:FF:FF
inet addr:192.168.122.1Bcast:192.168.122.255Mask:255.255.255.0
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b)TX bytes:0 (0.0 b)
我们Dom2的ip地址为：
# xm console Dom2
# ifconfig eth0
eth0 Link encap:EthernetHWaddr 00:16:3E:DD:82:E8
inet addr:192.168.122.71Bcast:192.168.122.255Mask:255.255.255.0
inet6 addr: fe80::216:3eff:fedd:82e8/64 Scope:Link
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:2319 errors:0 dropped:0 overruns:0 frame:0
TX packets:89 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:93605 (91.4 KiB)TX bytes:10126 (9.8 KiB)
Interrupt:247
我们发现Dom2默认使用的是virbr0这个桥，通过
使用：A single bridged network configured with a local IP address via DHCP
修改vifbr0的IP地址跟主机Dom0在同一个网段内（10.43.2.0/24）
通过以上信息我们知道在装完livrit-manager后Dom2默认使用的是livirt提供的virbr0这个桥，而这个桥默认是使用的NAT模式。
1.增加一个桥xenbr0
在/etc/sysconfig/network-scripts/下创建ifcfg-xenbr0为以下内容
# vim ifcfg-xenbr0
DEVICE=xenbr0
TYPE=Bridge
ONBOOT=yes
DELAY=0
BOOTPROTO=dhcp
NM_CONTROLLED=no
2.修改ifcfg-eth0为以下内容：（将eth0关联到桥xenbr0上边）
# vim ifcfg-eth0
DEVICE=eth0
HWADDR=00:0C:29:2E:72:81
ONBOOT=yes
NM_CONTROLLED=no
BRIDGE=xenbr0
3.reboot
# ifconfig
eth0 Link encap:EthernetHWaddr 00:0C:29:2E:72:81
inet6 addr: fe80::20c:29ff:fe2e:7281/64 Scope:Link
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:3882 errors:0 dropped:0 overruns:0 frame:0
TX packets:61 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:431458 (421.3 KiB)TX bytes:7243 (7.0 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNINGMTU:65536Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b)TX bytes:0 (0.0 b)
vif1.0 Link encap:EthernetHWaddr FE:FF:FF:FF:FF:FF
inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:29 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:0 (0.0 b)TX bytes:1664 (1.6 KiB)
virbr0 Link encap:EthernetHWaddr FE:FF:FF:FF:FF:FF
inet addr:192.168.122.1Bcast:192.168.122.255Mask:255.255.255.0
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b)TX bytes:0 (0.0 b)
xenbr0 Link encap:EthernetHWaddr 00:0C:29:2E:72:81
inet addr:10.43.2.11Bcast:10.43.2.255Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe2e:7281/64 Scope:Link
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:2631 errors:0 dropped:0 overruns:0 frame:0
TX packets:77 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:160369 (156.6 KiB)TX bytes:10303 (10.0 KiB)
重启后我们发现xenbr0现在拥有eth0的MAC地址和IP地址。
4.去掉默认使用的default配置（virbr0）
进入virsh命令行：
virsh # net-destroydefault
Network default destroyed
virsh # net-undefine default
Network default has been undefined
service libvirtd restart
5.修改Dom2默认使用的桥
# virsh edit Dom2
将以下信息：
<source bridge='virbr0'/>
改为
<source bridge='xenbr0'/>
6.重新启动Dom2并连接Dom2
xm start Dom2
xm console Dom2
# ifconfig
eth0 Link encap:EthernetHWaddr 00:16:3E:DD:82:E8
inet addr:10.43.2.104Bcast:10.43.2.255Mask:255.255.255.0
inet6 addr: fe80::216:3eff:fedd:82e8/64 Scope:Link
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:414 errors:0 dropped:0 overruns:0 frame:0
TX packets:17 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:27434 (26.7 KiB)TX bytes:2028 (1.9 KiB)
Interrupt:247
lo Link encap:Local Loopback
inet addr:127.0.0.1Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNINGMTU:16436Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b)TX bytes:0 (0.0 b)
观察到Dom2的IP地址已经和Dom0在同一个网段了。
后来发现使用virsh这个管理工具的时候有一个简单的命令也可以实现
virsh iface-bridge eth0 xenbr0
总结：
删除默认的virbr0--->创建一个桥（桥设置为DHCP获取IP地址）---->将物理网卡关联到此桥上边----->重启操作系统
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