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使用网桥，LXC 容器无法 ping 路由器，但主机操作系统可以

tag-icon • tag-icon networking virtualbox bridge lxc
使用网桥，LXC 容器无法 ping 路由器，但主机操作系统可以

我有一个在 virtualbox 下运行的虚拟机，在该虚拟机中我有一个 LXC 容器，我正在尝试桥接到 virtualbox 的 NAT 接口：

-------------      -----------      -----------      ----------      ----------
| LXC       | ---> | Host OS | ---> | Virtual | ---> | Laptop | ---> | Router |
| Container |      | Linxu   |      | Box     |      |        |      |        |
-------------      -----------      -----------      ----------      ----------
eth0 10.1.0.35     br0 <-> eth0     NAT GW:          192.168.1.33    GW:
gw 10.1.0.2        br0 10.1.0.5      10.1.0.2/16                      192.168.1.1
                   gw 10.1.0.2

Ping 10.1.0.2      ping 10.1.0.2
 FAIL               OK

我无法从 LXC 容器 ping 到 virtualbox 网关，但可以从主机操作系统 ping 通。

注意：tcpdump在主机操作系统上运行，我可以唱从容器发送到路由器的 ping，以及从路由器到容器的回复，但tcpdump在容器上显示没有流量。

LXC eth0

eth0      Link encap:Ethernet  HWaddr 00:16:3e:ed:82:b8
          inet addr:10.1.0.35  Bcast:10.1.255.255  Mask:255.255.0.0
          inet6 addr: fe80::216:3eff:feed:82b8/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:585 errors:0 dropped:0 overruns:0 frame:0
          TX packets:588 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:58003 (58.0 KB)  TX bytes:56447 (56.4 KB)

主机操作系统：

root@ubuntuserver:/# ifconfig
br0       Link encap:Ethernet  HWaddr 08:00:27:ca:5f:7a
          inet addr:10.1.0.5  Bcast:10.1.255.255  Mask:255.255.0.0
          inet6 addr: fe80::a00:27ff:feca:5f7a/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:2012 errors:0 dropped:0 overruns:0 frame:0
          TX packets:882 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:158794 (158.7 KB)  TX bytes:139083 (139.0 KB)

eth0      Link encap:Ethernet  HWaddr 08:00:27:ca:5f:7a
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:2968 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2404 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:281188 (281.1 KB)  TX bytes:312109 (312.1 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:180 errors:0 dropped:0 overruns:0 frame:0
          TX packets:180 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:14376 (14.3 KB)  TX bytes:14376 (14.3 KB)

vethStvXMU Link encap:Ethernet  HWaddr fe:9a:36:3a:84:1c
          inet6 addr: fe80::fc9a:36ff:fe3a:841c/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:557 errors:0 dropped:0 overruns:0 frame:0
          TX packets:554 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:53465 (53.4 KB)  TX bytes:55003 (55.0 KB)


root@ubuntuserver:/# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.080027ca5f7a       no              eth0
                                                        vethStvXMU

答案1

尝试添加以下 iptables 规则：

iptables -A POSTROUTING -s 10.1.0/24 -o vmbr0 -j SNAT --to-source 148.251.79.108
iptables -A POSTROUTING -s 192.168.10.0/24 -o vmbr0 -j MASQUERADE

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