无法从桥接接口ping通

我试图在Ubuntu 11.04虚拟机箱之间桥接eth2和br0 。 有networking桥接到主机物理机。

从桥接后的客户操作系统，我可以ping从br0但不是从eth2 。 为什么？

ping -I eth2 bbc.co.uk ：

 PING bbc.co.uk (212.58.241.131) from 172.16.4.186 eth2: 56(84) bytes of data. From VirtualBox.local (172.16.4.103) icmp_seq=2 Destination Host Unreachable From VirtualBox.local (172.16.4.103) icmp_seq=3 Destination Host Unreachable 

ping -I br0 bbc.co.uk

• 使用绑定，桥接和iSCSI引导无盘Debian系统
• Xen虚拟机不会出现：找不到桥设备xenbr0（configuration为使用路由）
• 不能在相同的子网内ping linuxnetworking命名空间
• / etc / network / interfaces文件几乎为空
• openwrt使用一个单一的接口桥？

 PING bbc.co.uk (212.58.241.131) from 172.16.4.186 br0: 56(84) bytes of data. 64 bytes from virtual-vip.thdo.bbc.co.uk (212.58.241.131): icmp_req=1 ttl=239 time=31.2 ms 

我的/ etc / network / interfaces如下

 auto lo iface lo inet loopback auto eth2 iface eth2 inet manual auto br0 iface br0 inet static address 172.16.4.186 network 172.16.4.255 netmask 255.255.255.0 broadcast 172.16.4.255 gateway 172.16.4.1 bridge_ports eth2 bridge_stp off bridge_fd 0 bridge_maxwait 0 

网关是

route -n

 Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 172.16.4.1 0.0.0.0 UG 100 0 0 br0 172.16.4.0 0.0.0.0 255.255.255.0 U 0 0 0 br0 172.16.4.0 0.0.0.0 255.255.255.0 U 1 0 0 eth3 

ifconfig

 br0 Link encap:Ethernet HWaddr 08:00:27:4a:08:57 inet addr:172.16.4.186 Bcast:172.16.4.255 Mask:255.255.255.0 inet6 addr: fe80::a00:27ff:fe4a:857/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2969 errors:0 dropped:0 overruns:0 frame:0 TX packets:267 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:200777 (200.7 KB) TX bytes:28141 (28.1 KB) eth0 Link encap:Ethernet HWaddr 08:00:27:df:f5:a7 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:36 errors:0 dropped:0 overruns:0 frame:0 TX packets:392 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:3904 (3.9 KB) TX bytes:55700 (55.7 KB) eth2 Link encap:Ethernet HWaddr 08:00:27:4a:08:57 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:19849 errors:0 dropped:0 overruns:0 frame:0 TX packets:1206 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1631595 (1.6 MB) TX bytes:114927 (114.9 KB) eth3 Link encap:Ethernet HWaddr 08:00:27:50:00:2d inet addr:172.16.4.103 Bcast:172.16.4.255 Mask:255.255.255.0 inet6 addr: fe80::a00:27ff:fe50:2d/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:19515 errors:0 dropped:0 overruns:0 frame:0 TX packets:145 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1625905 (1.6 MB) TX bytes:17450 (17.4 KB) 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:113 errors:0 dropped:0 overruns:0 frame:0 TX packets:113 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:12544 (12.5 KB) TX bytes:12544 (12.5 KB)