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<p class="MsoNormal">Hi All,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Let me brief my question, I have two NIC ports, one is connect to internal (eno1) and the other (eno2) is external, my openstack cluster is based on the devstack and neutron is configured as OVS + vxlan, How can I make my VM could be able
to access external with eno2 port? <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I tried to add the port to br-ex but it seems doesn’t work, the VM still go to the default route on the physical node which is via eno1.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">$ ovs-vsctl add-port br-ex eno2<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks in the advance for any comments!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best Regards,<o:p></o:p></p>
<p class="MsoNormal">Dave Chen<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Chen2, Dave <br>
<b>Sent:</b> Friday, June 15, 2018 4:17 PM<br>
<b>To:</b> 'openstack-dev@lists.openstack.org'<br>
<b>Cc:</b> Chen2, Dave<br>
<b>Subject:</b> [neutron] Question on the OVS configuration<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Dear folks, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have setup a pretty simple OpenStack cluster in our lab based on devstack, couples of guest VM are running on one controller node (this doesn’t looks like a right behavior anyway), the Neutron network is configured as OVS + vxlan, the
bridge “br-ex” configured as below:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> Bridge br-ex<o:p></o:p></p>
<p class="MsoNormal"> Controller "tcp:127.0.0.1:6633"<o:p></o:p></p>
<p class="MsoNormal"> is_connected: true<o:p></o:p></p>
<p class="MsoNormal"> fail_mode: secure<o:p></o:p></p>
<p class="MsoNormal"> Port phy-br-ex<o:p></o:p></p>
<p class="MsoNormal"> Interface phy-br-ex<o:p></o:p></p>
<p class="MsoNormal"> type: patch<o:p></o:p></p>
<p class="MsoNormal"> options: {peer=int-br-ex}<o:p></o:p></p>
<p class="MsoNormal"> Port br-ex<o:p></o:p></p>
<p class="MsoNormal"> Interface br-ex<o:p></o:p></p>
<p class="MsoNormal"> type: internal<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:9.75pt">ovs_version: "2.8.0"<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:9.75pt"><o:p> </o:p></p>
<p class="MsoNormal" style="text-indent:9.75pt"><o:p> </o:p></p>
<p class="MsoNormal" style="text-indent:9.75pt"><o:p> </o:p></p>
<p class="MsoNormal">As you see, there is no external physical NIC bound to “br-ex”, so I guess the traffic from the VM to external will use the default route set on the controller node, since there is a NIC (eno2) that can access external so I bind it to
“br-ex” like this: ovs-vsctl add-port br-ex eno2. now the “br-ex” is configured as below: <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> Bridge br-ex<o:p></o:p></p>
<p class="MsoNormal"> Controller "tcp:127.0.0.1:6633"<o:p></o:p></p>
<p class="MsoNormal"> is_connected: true<o:p></o:p></p>
<p class="MsoNormal"> fail_mode: secure<o:p></o:p></p>
<p class="MsoNormal"> Port phy-br-ex<o:p></o:p></p>
<p class="MsoNormal"> Interface phy-br-ex<o:p></o:p></p>
<p class="MsoNormal"> type: patch<o:p></o:p></p>
<p class="MsoNormal"> options: {peer=int-br-ex}<o:p></o:p></p>
<p class="MsoNormal"> *<b>Port "eno2"</b>*<o:p></o:p></p>
<p class="MsoNormal"> Interface "eno2"<o:p></o:p></p>
<p class="MsoNormal"> Port br-ex<o:p></o:p></p>
<p class="MsoNormal"> Interface br-ex<o:p></o:p></p>
<p class="MsoNormal"> type: internal<o:p></o:p></p>
<p class="MsoNormal"> ovs_version: "2.8.0"<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Looks like this is how it should be configured according to lots of wiki/blog suggestion I have googled, but it doesn’t work as expected, ping from the VM, the tcpdump shows the traffic still go the “eno1” which is the default route on
the controller node. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Inside of VM<o:p></o:p></p>
<p class="MsoNormal">ubuntu@test-br:~$ ping 8.8.8.8<o:p></o:p></p>
<p class="MsoNormal">PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.<o:p></o:p></p>
<p class="MsoNormal">64 bytes from 8.8.8.8: icmp_seq=1 ttl=38 time=168 ms<o:p></o:p></p>
<p class="MsoNormal">64 bytes from 8.8.8.8: icmp_seq=2 ttl=38 time=168 ms<o:p></o:p></p>
<p class="MsoNormal">…<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Dump the traffic on the “eno2”, got nothing<o:p></o:p></p>
<p class="MsoNormal">$ sudo tcpdump -nn -i eno2 icmp<o:p></o:p></p>
<p class="MsoNormal">tcpdump: verbose output suppressed, use -v or -vv for full protocol decode<o:p></o:p></p>
<p class="MsoNormal">listening on eno2, link-type EN10MB (Ethernet), capture size 262144 bytes<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:9.75pt">…<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:9.75pt"><o:p> </o:p></p>
<p class="MsoNormal">Dump the traffic on the “eno1” (internal NIC), catch it!<o:p></o:p></p>
<p class="MsoNormal">$ sudo tcpdump -nn -i eno1 icmp<o:p></o:p></p>
<p class="MsoNormal">tcpdump: verbose output suppressed, use -v or -vv for full protocol decode<o:p></o:p></p>
<p class="MsoNormal">listening on eno1, link-type EN10MB (Ethernet), capture size 262144 bytes<o:p></o:p></p>
<p class="MsoNormal">16:08:59.609888 IP 192.168.20.132 > 8.8.8.8: ICMP echo request, id 1439, seq 1, length 64<o:p></o:p></p>
<p class="MsoNormal">16:08:59.781042 IP 8.8.8.8 > 192.168.20.132: ICMP echo reply, id 1439, seq 1, length 64<o:p></o:p></p>
<p class="MsoNormal">16:09:00.611453 IP 192.168.20.132 > 8.8.8.8: ICMP echo request, id 1439, seq 2, length 64<o:p></o:p></p>
<p class="MsoNormal">16:09:00.779550 IP 8.8.8.8 > 192.168.20.132: ICMP echo reply, id 1439, seq 2, length 64<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:9.75pt"><o:p> </o:p></p>
<p class="MsoNormal" style="text-indent:9.75pt"><o:p> </o:p></p>
<p class="MsoNormal">$ sudo ip route<o:p></o:p></p>
<p class="MsoNormal">default via 192.168.18.1 dev eno1 proto static metric 100<o:p></o:p></p>
<p class="MsoNormal">default via 192.168.8.1 dev eno2 proto static metric 101<o:p></o:p></p>
<p class="MsoNormal">169.254.0.0/16 dev docker0 scope link metric 1000 linkdown<o:p></o:p></p>
<p class="MsoNormal">172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown<o:p></o:p></p>
<p class="MsoNormal">192.168.8.0/24 dev eno2 proto kernel scope link src 192.168.8.101 metric 100<o:p></o:p></p>
<p class="MsoNormal">192.168.16.0/21 dev eno1 proto kernel scope link src 192.168.20.132 metric 100<o:p></o:p></p>
<p class="MsoNormal">192.168.42.0/24 dev br-ex proto kernel scope link src 192.168.42.1<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">What’s going wrong here? Do I miss something? Or some service need to be restarted?
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Anyone could help me out? This question made me sick for many days! Huge thanks in the advance!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best Regards,<o:p></o:p></p>
<p class="MsoNormal">Dave <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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