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Xen：无法从 domU ping 到 dom0

tag-icon • tag-icon networking xen bridge hypervisor
Xen：无法从 domU ping 到 dom0

我有 2 台本地连接的 PC。我在 PC1 上创建了 2 个虚拟机，并使用 dom0 中的 eth0 接口通过桥接添加了连接。

From dom0: 

#brctl addbr xenbr0
#brctl addif xenbr0 eth0
#ifconfig xenbr0 10.0.2.4
#xl create /etc/xen/dom1.cfg
#xl create /etc/xen/dom2.cfg

#ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0A:35:00:22:01
          inet addr:10.0.2.1  Bcast:10.255.255.255  Mask:255.0.0.0
          inet6 addr: fe80::20a:35ff:fe00:2201/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:228 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1228 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:36193 (35.3 KiB)  TX bytes:407300 (397.7 KiB)
          Interrupt:25

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:65536  Metric:1
          RX packets:5 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:560 (560.0 B)  TX bytes:560 (560.0 B)

vif2.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10 errors:0 dropped:0 overruns:0 frame:0
          TX packets:19 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:2524 (2.4 KiB)  TX bytes:2558 (2.4 KiB)

vif3.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:6 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:1212 (1.1 KiB)  TX bytes:1165 (1.1 KiB)

xenbr0    Link encap:Ethernet  HWaddr 00:0A:35:00:22:01
          inet addr:10.0.2.3  Bcast:10.255.255.255  Mask:255.0.0.0
          inet6 addr: fe80::20a:35ff:fe00:2201/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:20 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:4224 (4.1 KiB)  TX bytes:648 (648.0 B)

在 Xen cfg 文件中，我有此行“vif = ['script=vif-bridge, bridge=xenbr0']”

来自 domU

#ifconfig
eth0      Link encap:Ethernet  HWaddr 00:16:3E:60:FC:91
          inet addr:10.0.2.6  Bcast:10.255.255.255  Mask:255.0.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:94 errors:0 dropped:0 overruns:0 frame:0
          TX packets:68 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:23886 (23.3 KiB)  TX bytes:22500 (21.9 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:65536  Metric: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)

启动到客户虚拟机后，我有以下 ping 状态：

  • domU 之间的 Ping 操作正常。
  • domU 和 PC2 之间的 Ping 通畅。
  • 从 domU 到 dom0（PC1）的 Ping 不正常！

感谢您的时间和帮助！

答案1

eth0 和 xenbr0 都有一个 IP（甚至是同一个 IP）。删除 eth0 上的 IP。网桥是第 2 层抽象，因此您不能在连接到它的接口上进行第 3 层寻址。将 IP 保留在网桥接口上，因为那是您将第 3 层寻址放在的接口上。​​对于您连接到网桥的任何设备（包括绑定），这都是正确的。第 2 层堆栈的末端获取第 3 层地址。

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