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<div>Hi Andrea,</div>
<div><br>
</div>
<div>Though both interfaces come up, only one will response to the ping from the neutron router.</div>
<div>When I disable it, then the second one will response to ping.</div>
<div>So it looks like only one interface is useful at a time.</div>
<div><br>
</div>
<div>My question is is there any useful case for this, I.e. Why would you do this?</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Danny</div>
<div><br>
</div>
<div><br>
</div>
<div>
<div>Date: Tue, 2 Dec 2014 10:44:57 +0000</div>
<div>From: Andrea Frittoli <<a href="mailto:andrea.frittoli@gmail.com">andrea.frittoli@gmail.com</a>></div>
<div>To: "OpenStack Development Mailing List (not for usage questions)"</div>
<div><span class="Apple-tab-span" style="white-space: pre;"></span><<a href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>></div>
<div>Subject: Re: [openstack-dev] [qa] Should it be allowed to attach 2</div>
<div><span class="Apple-tab-span" style="white-space: pre;"></span>interfaces from the same subnet to a VM?</div>
<div>Message-ID:</div>
<div><span class="Apple-tab-span" style="white-space: pre;"></span><<a href="mailto:CAB7WYGV4+Ji-tJ5JkVG98kW0hxOt8zLnUK+nzVjywfdijiou6Q@mail.gmail.com">CAB7WYGV4+Ji-tJ5JkVG98kW0hxOt8zLnUK+nzVjywfdijiou6Q@mail.gmail.com</a>></div>
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<div>Hello Danny,</div>
<div><br>
</div>
<div>I think so. Any special concern with a VM using more than one port on a subnet?</div>
<div><br>
</div>
<div>andrea</div>
<div><br>
</div>
<div>On 2 December 2014 at 02:04, Danny Choi (dannchoi) <<a href="mailto:dannchoi@cisco.com">dannchoi@cisco.com</a>> wrote:</div>
<blockquote id="MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style="border-left-color: rgb(181, 196, 223); border-left-width: 5px; border-left-style: solid; padding: 0px 0px 0px 5px; margin: 0px 0px 0px 5px;">
<div style="font-family: Consolas; font-size: medium;">Hi,</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">When I attach 2 interfaces from the same subnet to a VM, there is no error</div>
<div style="font-family: Consolas; font-size: medium;">returned and</div>
<div style="font-family: Consolas; font-size: medium;">both interfaces come up.</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">lab@tme211:/opt/stack/logs$ nova interface-attach --net-id</div>
<div style="font-family: Consolas; font-size: medium;">e38dba4a-74ed-4312-ba21-2a04b5c5a5b5 cirros-1</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">lab@tme211:/opt/stack/logs$ nova list</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">+--------------------------------------+----------+--------+------------+-------------+-------------------+</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">| ID | Name | Status | Task State |</div>
<div style="font-family: Consolas; font-size: medium;">Power State | Networks |</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">+--------------------------------------+----------+--------+------------+-------------+-------------------+</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">| 9d88d0b5-2453-4657-8058-987980ec7744 | cirros-1 | ACTIVE | - |</div>
<div style="font-family: Consolas; font-size: medium;">Running | private=10.0.0.10 |</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">+--------------------------------------+----------+--------+------------+-------------+-------------------+</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">lab@tme211:/opt/stack/logs$ nova interface-attach --net-id</div>
<div style="font-family: Consolas; font-size: medium;">e38dba4a-74ed-4312-ba21-2a04b5c5a5b5 cirros-1</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">lab@tme211:/opt/stack/logs$ nova list</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">+--------------------------------------+----------+--------+------------+-------------+------------------------------+</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">| ID | Name | Status | Task State |</div>
<div style="font-family: Consolas; font-size: medium;">Power State | Networks |</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">+--------------------------------------+----------+--------+------------+-------------+------------------------------+</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">| 9d88d0b5-2453-4657-8058-987980ec7744 | cirros-1 | ACTIVE | - |</div>
<div style="font-family: Consolas; font-size: medium;">Running | private=10.0.0.10, 10.0.0.11 |</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">+--------------------------------------+----------+--------+------------+-------------+------------------------------+</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">$ ifconfig</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">eth0 Link encap:Ethernet HWaddr FA:16:3E:92:2D:2B</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"> inet addr:10.0.0.10 Bcast:10.0.0.255 Mask:255.255.255.0</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"> inet6 addr: fe80::f816:3eff:fe92:2d2b/64 Scope:Link</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"> RX packets:514 errors:0 dropped:0 overruns:0 frame:0</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"> TX packets:307 errors:0 dropped:0 overruns:0 carrier:0</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"> collisions:0 txqueuelen:1000</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"> RX bytes:48342 (47.2 KiB) TX bytes:41750 (40.7 KiB)</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">eth1 Link encap:Ethernet HWaddr FA:16:3E:EF:55:BC</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"> inet addr:10.0.0.11 Bcast:10.0.0.255 Mask:255.255.255.0</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"> inet6 addr: fe80::f816:3eff:feef:55bc/64 Scope:Link</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"> RX packets:49 errors:0 dropped:0 overruns:0 frame:0</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"> TX packets:8 errors:0 dropped:0 overruns:0 carrier:0</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"> collisions:0 txqueuelen:1000</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"> RX bytes:3556 (3.4 KiB) TX bytes:1120 (1.0 KiB)</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">Should this operation be allowed?</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">Thanks,</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">Danny</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;"><br>
</div>
<div style="font-family: Consolas; font-size: medium;">_______________________________________________</div>
<div style="font-family: Consolas; font-size: medium;">OpenStack-dev mailing list</div>
<div style="font-family: Consolas; font-size: medium;"><a href="mailto:OpenStack-dev@lists.openstack.org">OpenStack-dev@lists.openstack.org</a></div>
<div style="font-family: Consolas; font-size: medium;"><a href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev</a></div>
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