Open Stack

We usually serves reduced MTU to instances via DHCP option:

(at network node for neutron)
/etc/neutron/dnsmasq-neutron.conf:
dhcp-option-force=26,1476

On 08/26/2014 05:19 AM, Taeheum Na wrote:
>
> Hello, David
>
> Your comment was exactly correct!!
>
> I refer following blog. Then adjust MTU on the VM
>
> And current it’s work well.
>
> http://techbackground.blogspot.kr/2013/06/path-mtu-discovery-and-gre.html
>
> Thank you for your comment.
>
> It was helpful to save my time.
>
> *From:*medberry at gmail.com [mailto:medberry at gmail.com] *On Behalf Of 
> *David Medberry
> *Sent:* Tuesday, August 26, 2014 1:40 AM
> *To:* Taeheum Na
> *Cc:* openstack-operators at lists.openstack.org
> *Subject:* Re: [Openstack-operators] Iperf isn't work between VMs 
> which are placed in other host
>
> What MTU are you using (try different ping sizes to see if this 
> problem also occurs with large pings.)  You will likely want to limit 
> the vms to 1454 MTU and re-run your tests. Google for GRE OPENSTACK 
> MTU for more info.
>
> On Mon, Aug 25, 2014 at 11:23 AM, Taeheum Na <thna at nm.gist.ac.kr 
> <mailto:thna at nm.gist.ac.kr>> wrote:
>
>     Hello, I tried to measure network performance BTW VM which
>     connected through GRE tunnel. So, I configured neutron(ML2/GRE).
>
>     Then I verified TCP performance between VMs which are placed on
>     same host.
>
>     But I could not make Iperf connection BTW VMs (on other host), but
>     ping is ok.
>
>     bellow things are current Security group configuration. I think
>     that I allow all traffic which is needed to execute iperf.
>
>     +-------------+-----------+---------+-----------+--------------+
>
>     |IP Protocol|FromPort|ToPort|IP Range|SourceGroup|
>
>     +-------------+-----------+---------+-----------+--------------+
>
>     |udp |1|65535|0.0.0.0/0||
>
>     |tcp |1|65535|0.0.0.0/0||
>
>     |icmp |-1|-1|0.0.0.0/0||
>
>     +-------------+-----------+---------+-----------+--------------+
>
>     Do you have any comment?
>
>     Regards
>
>     Taeheum Na
>
>     ****************************************************
>
>     M.S. candidate of Networked Computing Systems Lab.
>
>     School of Information and Communications
>
>     GIST (Gwangju Inst. of Sci. and Tech.)
>
>     E-mail: thna at nm.gist.ac.kr <mailto:thna at nm.gist.ac.kr>
>
>     Phone: +82-10-2238-9424 <tel:%2B82-10-2238-9424>
>
>     Office: +82-62-715-2273 <tel:%2B82-62-715-2273>
>
>
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