Thank you for the help. 发送自 Outlook ________________________________ 发件人: Ben Pfaff <b...@ovn.org> 发送时间: 2019年3月19日 4:32:22 收件人: pei Jikui 抄送: ovs-discuss@openvswitch.org 主题: Re: 回复: [ovs-discuss] a question regarding to tap internal interface
I think that "tap" is just the name of the interface in that case. I don't know why it is named "tap". On Sat, Mar 16, 2019 at 11:27:21PM +0000, pei Jikui wrote: > Ben, > > Thanks much for your reply. > > My confusion comes from the openstack's official document of > https://docs.openstack.org/liberty/networking-guide/scenario-classic-ovs.html > > As illustrated in the picture, we can see that the interface used to > connect ovs and dhcp-netns is a tap interface. While from the output of > "ovs-vsctl show", it indicates that the type of interface is internal. That > confuses me much. > > I am thinking that the tap interface is for the name of the interface > instead of the type of the interface? > > Thanks > > > > > > > > > 发送自 Outlook<http://aka.ms/weboutlook> > > ________________________________ > 发件人: Ben Pfaff <b...@ovn.org> > 发送时间: 2019年3月17日 1:44 > 收件人: pei Jikui > 抄送: ovs-discuss@openvswitch.org > 主题: Re: [ovs-discuss] a question regarding to tap internal interface > > On Sat, Mar 16, 2019 at 11:24:34AM +0000, pei Jikui wrote: > > hi, > > > > 1) From the openstack documents, we know that for the tenant's dhcp > > functionality, the usage is to connect a dhcp netns to the ovs using a tap > > interface. > > At the same time, the ovs-vsctl show that the tap interface is a type of > > internal interface for OVS. > > This is wrong. Tap and internal are different kinds of interfaces. > What does ovs-vsctl show that makes you confuse the two? > > > While I could not add a tap type interface to ovs as an internal type of > > interface for OVS. > > > > The commands I used, > > a) ip tuntap add dev tap0 mode tap. > > b) ovs-vsctl add-port ovs0 tap0 -- set inteface tap0 type=internal > > These commands are wrong. If you create a tap interface, you must not > tell ovs-vsctl that it is an internal interface. > > What led you to believe that these commands were correct? > > > error: "could not add network device tap12 to ofproto (No such device)" > > > > 2) My questions are , > > a) how to add a tap interface to OVS and set it as internal type of > > interface of OVS? > > You cannot. That is not possible.
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