操作步骤
1.虚拟机正常，能ping通
2.新建虚拟机，如果虚拟机的宿主机为A
3.主机A上的原有虚拟机ping不通，新建的虚拟机正常
4.关闭主机防火墙，A上所有虚拟机都能ping通
5.过一段时间，A上防火墙自动起来，所有虚拟机也能正常ping通
总结就是，只有新建虚拟机时，新虚拟机所在主机上的原虚拟机会ping不通，新建的虚拟机正常。
查看主机上的防火墙状态如下：
[root@iad-kvm-1 ~]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
Chain FORWARD (policy ACCEPT)
num target prot opt source destination
1 BF-br-guest all -- 0.0.0.0/0 0.0.0.0/0 PHYSDEV match --physdev-is-bridged
2 BF-br-guest all -- 0.0.0.0/0 0.0.0.0/0 PHYSDEV match --physdev-is-bridged
3 DROP all -- 0.0.0.0/0 0.0.0.0/0
4 DROP all -- 0.0.0.0/0 0.0.0.0/0
Chain OUTPUT (policy ACCEPT)
num target prot opt source destination
Chain BF-br-guest (2 references)
num target prot opt source destination
1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
2 BF-br-guest-IN all -- 0.0.0.0/0 0.0.0.0/0 PHYSDEV match --physdev-is-in
--physdev-is-bridged
3 BF-br-guest-OUT all -- 0.0.0.0/0 0.0.0.0/0 PHYSDEV match --physdev-is-out
--physdev-is-bridged
4 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 PHYSDEV match --physdev-out
eth1 --physdev-is-bridged
Chain BF-br-guest-IN (1 references)
num target prot opt source destination
1 i-2-505-def all -- 0.0.0.0/0 0.0.0.0/0 PHYSDEV match --physdev-in
vnet6 --physdev-is-bridged
Chain BF-br-guest-OUT (1 references)
num target prot opt source destination
1 i-2-505-def all -- 0.0.0.0/0 0.0.0.0/0 PHYSDEV match --physdev-out
vnet6 --physdev-is-bridged
Chain i-2-505-VM (1 references)
num target prot opt source destination
1 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpts:1:65535 state NEW
2 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpts:1:65535 state NEW
3 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 255
4 DROP all -- 0.0.0.0/0 0.0.0.0/0
Chain i-2-505-VM-eg (1 references)
num target prot opt source destination
1 RETURN udp -- 0.0.0.0/0 0.0.0.0/0 udp dpts:1:65535 state NEW
2 RETURN tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpts:1:65535 state NEW
3 RETURN icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 255
4 DROP all -- 0.0.0.0/0 0.0.0.0/0
Chain i-2-505-def (2 references)
num target prot opt source destination
1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
2 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 PHYSDEV match --physdev-in
vnet6 --physdev-is-bridged udp spt:68 dpt:67
3 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 PHYSDEV match --physdev-out
vnet6 --physdev-is-bridged udp spt:67 dpt:68
4 RETURN udp -- 10.5.26.96 0.0.0.0/0 PHYSDEV match --physdev-in
vnet6 --physdev-is-bridged udp dpt:53
5 i-2-505-VM-eg all -- 10.5.26.96 0.0.0.0/0 PHYSDEV match --physdev-in
vnet6 --physdev-is-bridged
6 i-2-505-VM all -- 0.0.0.0/0 0.0.0.0/0 PHYSDEV match --physdev-out
vnet6 --physdev-is-bridged |