linux – 新的KVM来宾无法访问外部局域网

我可以从新访客访问的唯一内容是网络内的资源.尝试访问任何其他网络资源(包括通过网关的资源)会导致100％的数据包丢失到目标.

来宾通过桥接器连接,使用eth2访问网络.

主机网络按预期工作,另一个(当前只有一个)guest虚拟机的网络也可以通过同一个网桥连接.关闭工作客户并不能解决问题.

两位客人都通过DHCP获取网络详细信息.

在guest虚拟机的虚拟接口上从主机运行tcpdump会显示guest虚拟机尝试与外部通信,并且仅从主机和网关获取响应.

主办

有问题的访客目前通过vnet0连接.

# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNowN
    link/loopBACk 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BroaDCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:1e:4f:34:dc:79 brd ff:ff:ff:ff:ff:ff
3: eth1: <BroaDCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:1e:4f:34:dc:7b brd ff:ff:ff:ff:ff:ff
4: eth2: <BroaDCAST,MULTICAST,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UP qlen 1000
    link/ether 00:15:17:6a:fb:ee brd ff:ff:ff:ff:ff:ff
13: br0: <BroaDCAST,LOWER_UP> mtu 1500 qdisc noqueue state UP
    link/ether 00:15:17:6a:fb:ee brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.10/24 brd 192.168.0.255 scope global br0
    inet6 fe80::215:17ff:fe6a:fbee/64 scope link
       valid_lft forever preferred_lft forever
24: vnet0: <BroaDCAST,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNowN qlen 500
    link/ether fe:54:00:fc:0f:07 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc54:ff:fefc:f07/64 scope link
       valid_lft forever preferred_lft forever
25: vnet1: <BroaDCAST,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNowN qlen 500
    link/ether fe:54:00:89:8e:17 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc54:ff:fe89:8e17/64 scope link
       valid_lft forever preferred_lft forever
# ip route
default via 192.168.0.202 dev br0
192.168.0.0/24 dev br0  proto kernel  scope link  src 192.168.0.10
# cat /etc/network/interfaces
auto lo
iface lo inet loopBACk

auto br0
iface br0 inet dhcp
    bridge_ports    eth2
    bridge_stp      off
    bridge_maxwait  0
    bridge_fd       0
# brctl show
bridge name bridge id       STP enabled interfaces
br0     8000.0015176afbee   no      eth2
                            vnet0
                            vnet1

非工作客人

请注意,不工作的guest虚拟机使用busyBox ip.

# ip a
1: lo: <LOOPBACK,LOWER_UP> mtu 16436 qdisc noqueue
    link/loopBACk 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BroaDCAST,LOWER_UP> mtu 1500 qdisk pfifo_fast qlen 1000
    link/ether 52:54:00:fc:0f:07 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.27/24 scope global eth0
    inet6 fe80::5054:ff:fefc:f07/64 scope link
       valid_lft forever preferred_lft forever
# ip route
default via 192.168.0.202 dev eth0
192.168.0.0/24 dev eth0  src 192.168.0.27

工作嘉宾

# ip a
1: lo: <LOOPBACK,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:89:8e:17 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.12/24 brd 192.168.0.255 scope global eth0
    inet6 fe80::5054:ff:fe89:8e17/64 scope link
       valid_lft forever preferred_lft forever
# ip route
default via 192.168.0.202 dev eth0
192.168.0.0/24 dev eth0  proto kernel  scope link  src 192.168.0.12

主持人和客人都经营着Debian Wheezy.

我没有看到发布的详细信息中存在任何错误配置,特别是考虑到最近安装其他KVM来宾的完全相同的设置方法(并且即使现在也继续工作).可能是导致此问题的原因,我该如何解决？