Thank you again. I am deploying Liberty Neutron, according the official document, there are two NIC at least, but my physical machine has only one. Someone suggested me I could create a vlan interface, then everything would be ok. Until now, though I created the vlan interface, it can't attach to the Internet. Could other methods created virtual interface instead of vlan interface? Thanks Li yulei -----邮件原件----- 发件人: centos-bounces at centos.org [mailto:centos-bounces at centos.org] 代表 Gordon Messmer 发送时间: 2016年4月19日 11:18 收件人: CentOS mailing list 主题: Re: [CentOS] 答复: How to configure VLAN in CentOS7 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? _______________________________________________ CentOS mailing list CentOS at centos.org https://lists.centos.org/mailman/listinfo/centos