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output of the second capture of packets (ping from 192.168.153.2 in vlan 6 on cc201 to 192.168.155.4 in vlan 8 on cc202):

in_port(7),eth(src=fa:16:3e:1a:95:5b,dst=fa:16:3e:7f:6e:64),eth_type(0x0800),ipv4(src=192.168.153.2,dst=192.168.155.4,proto=1,tos=0,ttl=64,frag=no),icmp(type=8,code=0), packets:20, bytes:1960, used:0.192s, actions:6 in_port(1),eth(src=24:b6:57:f3:56:0b,dst=01:00:0c:cc:cc:cd),eth_type(0x8100),vlan(vid=26,pcp=7),encap(), packets:4549, bytes:291136, used:1.396s, actions:0 in_port(1),eth(src=54:52:48:00:08:13,dst=33:33:ff:00:08:13),eth_type(0x86dd),ipv6(src=fe80::5652:48ff:fe00:813,dst=ff02::1:ff00:813,label=0,proto=58,tclass=0,hlimit=1,frag=no),icmpv6(type=131,code=0), packets:0, bytes:0, used:never, actions:0 in_port(19),eth(src=fa:16:3e:22:d7:40,dst=fa:16:3e:1b:cf:e2),eth_type(0x0800),ipv4(src=192.168.153.2,dst=192.168.155.4,proto=1,tos=0,ttl=63,frag=no),icmp(type=8,code=0), packets:20, bytes:1960, used:0.192s, actions:push_vlan(vid=8,pcp=0),1

It says that operation push_vlan put the packets with tag 8 not tag 6!! I suppose it is the reason why two VMs from different vlan can ping connected!

But why???