KVM配置实现跨网段通信

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因公网ip 在同段资源不够用，以下在宿主机上配置不同br虚拟网卡和公网vlan号对应关系，实现跨公网可以通信：

1. 私网网卡：采用10.127.7 段的虚拟机网段：

# cat ifcfg-br0

DEVICE=br0

TYPE=Bridge

ONBOOT=yes

NM_CONTROLLED=yes

BOOTPROTO=none

HWADDR=78:2B:CB:0C:79:C4

IPADDR=10.127.7.59

PREFIX=24

DEFROUTE=yes

IPV4_FAILURE_FATAL=yes

IPV6INIT=no

# cat ifcfg-em1

DEVICE=em1

TYPE=Ethernet

ONBOOT=yes

NM_CONTROLLED=yes

BOOTPROTO=none

HWADDR=78:2B:CB:0C:79:C4

IPADDR=10.127.7.59

PREFIX=24

DEFROUTE=yes

IPV4_FAILURE_FATAL=yes

IPV6INIT=no

NAME="System em1"

BRIDGE=br0

br0 Link encap:Ethernet HWaddr78:2B:CB:0C:79:C4

inet addr:10.127.7.59 Bcast:10.127.7.255 Mask:255.255.255.0

inet6 addr: fe80::7a2b:cbff:fe0c:79c4/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:3848858 errors:0 dropped:0 overruns:0 frame:0

TX packets:2794283 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:8114192056 (7.5 GiB) TXbytes:220599518 (210.3 MiB)

em1 Link encap:Ethernet HWaddr78:2B:CB:0C:79:C4

inet6 addr: fe80::7a2b:cbff:fe0c:79c4/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:1151 errors:0 dropped:0 overruns:0 frame:0

TX packets:1787 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:85733 (83.7 KiB) TXbytes:495355 (483.7 KiB)

2. 公网网卡和vlan号对应关系：

交换机公网vlan号是 405和407

新建2个公网虚拟网卡配置文件：

/etc/sysconfig/network-scripts

# catifcfg-em2.405

DEVICE=em2.405

TYPE=Ethernet

ONBOOT=yes

BOOTPROTO=none

BRIDGE=br1

# cat ifcfg-em2.407

DEVICE=em2.407

TYPE=Ethernet

ONBOOT=yes

BOOTPROTO=none

BRIDGE=br2

# catifcfg-br1

DEVICE=br1

TYPE=Bridge

UUID=00c32166-0451-48bc-aa13-ead6fa2ec397

ONBOOT=yes

NM_CONTROLLED=yes

BOOTPROTO=none

HWADDR=78:2B:CB:0C:79:C5

IPV4_FAILURE_FATAL=yes

#cat ifcfg-br2

DEVICE=br2

TYPE=Bridge

ONBOOT=yes

NM_CONTROLLED=yes

BOOTPROTO=none

然后重启 network服务

br1 Linkencap:Ethernet HWaddr78:2B:CB:0C:79:C5

inet6 addr:fe80::7a2b:cbff:fe0c:79c5/64 Scope:Link

UP BROADCAST RUNNINGMULTICAST MTU:1500 Metric:1

RX packets:2373124errors:0 dropped:0 overruns:0 frame:0

TX packets:29006errors:0 dropped:0 overruns:0 carrier:0

collisions:0txqueuelen:0

RX bytes:114073875(108.7 MiB) TX bytes:1638764 (1.5 MiB)

br2 Link encap:Ethernet HWaddr 78:2B:CB:0C:79:C5

inet6 addr:fe80::7a2b:cbff:fe0c:79c5/64 Scope:Link

UP BROADCAST RUNNINGMULTICAST MTU:1500 Metric:1

RX packets:3911errors:0 dropped:0 overruns:0 frame:0

TX packets:6 errors:0dropped:0 overruns:0 carrier:0

collisions:0txqueuelen:0

RX bytes:177926(173.7 KiB) TX bytes:468 (468.0 b)

em2 Linkencap:Ethernet HWaddr78:2B:CB:0C:79:C5

inet6 addr:fe80::7a2b:cbff:fe0c:79c5/64 Scope:Link

UP BROADCAST RUNNINGMULTICAST MTU:1500 Metric:1

RX packets:10227errors:0 dropped:0 overruns:0 frame:0

TX packets:6269errors:0 dropped:0 overruns:0 carrier:0

collisions:0txqueuelen:1000

RX bytes:717882(701.0 KiB) TX bytes:416464 (406.7 KiB)

em2.405 Linkencap:Ethernet HWaddr78:2B:CB:0C:79:C5

inet6 addr:fe80::7a2b:cbff:fe0c:79c5/64 Scope:Link

UP BROADCAST RUNNINGMULTICAST MTU:1500 Metric:1

RX packets:12795 errors:0dropped:0 overruns:0 frame:0

TX packets:189errors:0 dropped:1 overruns:0 carrier:0

collisions:0txqueuelen:0

RX bytes:606392(592.1 KiB) TX bytes:21449 (20.9 KiB)

em2.407 Linkencap:Ethernet HWaddr78:2B:CB:0C:79:C5

inet6 addr:fe80::7a2b:cbff:fe0c:79c5/64 Scope:Link

UP BROADCAST RUNNINGMULTICAST MTU:1500 Metric:1

RX packets:7865errors:0 dropped:0 overruns:0 frame:0

TX packets:29errors:0 dropped:0 overruns:0 carrier:0

collisions:0txqueuelen:0

RX bytes:358072(349.6 KiB) TX bytes:2210 (2.1 KiB)

之后登入已装好的虚拟机windows，配置公网和私网ip：

然后ping公网，通了

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