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comix

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注册时间： 2020-08-15

帖子： 24

Re: qemu的虚拟网络接口处的ip一直无法获取并且虚拟机无法联网。

多谢，dnsmasq运行之后虚拟机的ip出来了

JayceCao

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注册时间： 2021-06-25

帖子： 1

Re: qemu的虚拟网络接口处的ip一直无法获取并且虚拟机无法联网。

使用

sudo brctl setageing br0 0

命令将桥接网络接口 br0 的 ageing time 设置为 0 即可。但是这个设置在系统重启之后会失效。我正在研究是这项设置永久生效的方法。

我再详细说明一下我遇到的问题，希望以后你遇到相同问题的时候能帮到你。我没有配置 DHCP，而是通过手动配置静态 IP。配置好后发现 ping 不通网关，而且 ping 同一网段其他 IP 的时候丢包严重。同时宿主机的内核日志有以下大量日志数据：

[  +0.563882] br0: received packet on eth0 with own address as source address (addr:8e:91:f8:c5:19:1b, vlan:0)
[  +0.245067] br0: received packet on eth0 with own address as source address (addr:8e:91:f8:c5:19:1b, vlan:0)
[Jun25 23:06] br0: received packet on eth0 with own address as source address (addr:8e:91:f8:c5:19:1b, vlan:0)
[  +0.778412] br0: received packet on eth0 with own address as source address (addr:8e:91:f8:c5:19:1b, vlan:0)
[Jun25 23:08] br0: received packet on eth0 with own address as source address (addr:8e:91:f8:c5:19:1b, vlan:0)
[  +0.894017] br0: received packet on eth0 with own address as source address (addr:8e:91:f8:c5:19:1b, vlan:0)
[Jun25 23:10] br0: received packet on eth0 with own address as source address (addr:8e:91:f8:c5:19:1b, vlan:0)
[  +0.048007] br0: received packet on eth0 with own address as source address (addr:8e:91:f8:c5:19:1b, vlan:0)
[  +2.234839] br0: received packet on eth0 with own address as source address (addr:8e:91:f8:c5:19:1b, vlan:0)
[  +0.590008] br0: received packet on eth0 with own address as source address (addr:8e:91:f8:c5:19:1b, vlan:0)

同时通过 DHCP 也获取不到 IP。
通过抓包发现，与 vm 内部网络接口对应的宿主机的 peer 网络接口不会将对端 host 发送的数据包转发给 vm，也就是说 vm 能发送数据包，目标 host 也有响应数据包，但是宿主机网络接口不会把响应数据包转发给 vm。
解决方法就是开始列出的那条命令。

最近编辑记录 JayceCao (2021-06-25 23:24:27)