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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">I was trying to setup a Devstack environment within an OpenStack VM(it’s host also neutron enabled), saying nested VM<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">My OpenStack VM is configure with IP (192.168.77.37 and floating IP 192.168.1.121) on eth0 , I can ping it from HOST namespace, or ping the floating IP, it has internet connectivity as well.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">After I tried to setup the devstack(with neutron enabled) on the OpenStack VM, the devstack failed due to network unreachable, and could not ping the 192.168.77.37 or 192.168.1.121<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div style="mso-element:para-border-div;border:none;border-bottom:double windowtext 2.25pt;padding:0in 0in 1.0pt 0in">
<p class="MsoNormal" style="border:none;padding:0in">Here is the OpenStack VM(not host’s) config:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">sudo ovs-vsctl show<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"> Port “eth0”<o:p></o:p></p>
<p class="MsoNormal"> Interface “eth0”<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">….<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">And ip of eth0 is set to br-ex as expected.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="border:none;padding:0in"># I can arping the IP from HOST namespace<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">ip netns exec qdhcp-89caf1b4-27f9-4744-a4db-176453fac80e arping 192.168.77.37<o:p></o:p></p>
<p class="MsoNormal">ARPING 192.168.77.37 from 192.168.77.2 tap676cac8b-02<o:p></o:p></p>
<p class="MsoNormal">Unicast reply from 192.168.77.37 [5E:A8:F3:A3:68:46] 2.227ms<o:p></o:p></p>
<p class="MsoNormal">Unicast reply from 192.168.77.37 [5E:A8:F3:A3:68:46] 1.112ms<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="border:none;padding:0in"># But ping will fail<o:p></o:p></p>
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<p class="MsoNormal">ip netns exec qdhcp-89caf1b4-27f9-4744-a4db-176453fac80e ping 192.168.77.37<o:p></o:p></p>
<p class="MsoNormal">PING 192.168.77.37 (192.168.77.37) 56(84) bytes of data.<o:p></o:p></p>
<p class="MsoNormal">^C<o:p></o:p></p>
<p class="MsoNormal">--- 192.168.77.37 ping statistics ---<o:p></o:p></p>
<p class="MsoNormal">337 packets transmitted, 0 received, 100% packet loss, time 338680ms<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I tcpdump a lot of interfaces, found the OpenStack VM did reply the outter ./st request, but the reply package stopped at veth pair(qvod2a60161-b3 )of the OpenStack VM, while package could be dumped from the Linux bridge(qbrd2a60161-b3
)<o:p></o:p></p>
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<p class="MsoNormal" style="border:none;padding:0in">See following tcpdump output:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">tcpdump -i qbrd2a60161-b3 -ne<o:p></o:p></p>
<p class="MsoNormal">tcpdump: WARNING: qbrd2a60161-b3: no IPv4 address assigned<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 qbrd2a60161-b3, link-type EN10MB (Ethernet), capture size 65535 bytes<o:p></o:p></p>
<p class="MsoNormal">00:20:30.256200 fa:16:3e:2c:37:cc > 5e:a8:f3:a3:68:46, ethertype IPv4 (0x0800), length 98: 192.168.77.2 > 192.168.77.37: ICMP echo request, id 1369, seq 1, length 64<o:p></o:p></p>
<p class="MsoNormal">00:20:30.257176 5e:a8:f3:a3:68:46 > fa:16:3e:2c:37:cc, ethertype IPv4 (0x0800), length 98: 192.168.77.37 > 192.168.77.2: ICMP echo reply, id 1369, seq 1, length 64<o:p></o:p></p>
<p class="MsoNormal">00:20:31.264591 fa:16:3e:2c:37:cc > 5e:a8:f3:a3:68:46, ethertype IPv4 (0x0800), length 98: 192.168.77.2 > 192.168.77.37: ICMP echo request, id 1369, seq 2, length 64<o:p></o:p></p>
<p class="MsoNormal">00:20:31.264836 5e:a8:f3:a3:68:46 > fa:16:3e:2c:37:cc, ethertype IPv4 (0x0800), length 98: 192.168.77.37 > 192.168.77.2: ICMP echo reply, id 1369, seq 2, length 64<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">tcpdump -i qvod2a60161-b3 -ne<o:p></o:p></p>
<p class="MsoNormal">00:21:34.264419 fa:16:3e:2c:37:cc > 5e:a8:f3:a3:68:46, ethertype IPv4 (0x0800), length 98: 192.168.77.2 > 192.168.77.37: ICMP echo request, id 1369, seq 65, length 64<o:p></o:p></p>
<p class="MsoNormal">00:21:35.264450 fa:16:3e:2c:37:cc > 5e:a8:f3:a3:68:46, ethertype IPv4 (0x0800), length 98: 192.168.77.2 > 192.168.77.37: ICMP echo request, id 1369, seq 66, length 64<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I wonder who can lead me out of the trap, or it’s just a OpenStack limitation?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks<o:p></o:p></p>
<p class="MsoNormal">Peter<o:p></o:p></p>
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