On 04/18/2016 08:01 PM, liyulei wrote: > And I used the command "tcpdump -i eno1.5 " to > capture the datagrams through the vlan interface, there were only repeated > outputs: > ARP who has 192.68.81.254 Tell 192.168.81.3 > > Could you tell me the reason for that? My guess would be that the switch isn't configured to give you access to VLAN 5 with tagged packets. In that case, there's no need for you to configure eno1.5 Specifically what are you trying to accomplish by configuring a tagged VLAN interface?