[Openstack] Urgent! MTU size issue
rick.jones2 at hpe.com
Wed Nov 9 21:33:27 UTC 2016
On 11/09/2016 12:56 PM, Satish Patel wrote:
> If i enable Jumbo frames on openstack in that case do i need to change
> or enable anything on my external/physical network infrastructure?
In the most succinct terms, all nodes in the same "broadcast domain"
(anywhere reachable via layer 2 - aka ethernet - and switching rather
than layer 3 and routing) must have the same physical MTU.
If you have end-nodes with JumboFrames enabled, the physical
infrastructure joining them at layer2 must also have JumboFrames enabled.
> On Wed, Nov 9, 2016 at 3:13 PM, Mohammed Naser <mnaser at vexxhost.com> wrote:
>> Are you using any tunnelling or are you directly attaching to your physical network?
>> If you're using tunnelling, I would recommend running jumbo frames on your compute and network nodes so they can transport packets with size of 1500. There is plenty of docs about this online that you can check.
>> Sent from my iPhone
>>> On Nov 9, 2016, at 11:06 AM, Satish Patel <satish.txt at gmail.com> wrote:
>>> We have 3 node cluster on Mikata openstack and we are using DVR
>>> network. Recently we build two puppetmaster server on openstack and
>>> put them behind Lbaasv2 load-balancer to share load but i found my
>>> none of client able to talk to correctly with puppetmaster server on
>>> openstack. After lots of research found openstack VM use mtu 1400 and
>>> my rest of puppet agent server who are not on openstack they used mtu
>>> as soon as i change puppet agent MTU size to 1400 everything started
>>> working. But just surprised why openstack use 1400 for VM there must
>>> be a reason like vxlan or GRE.
>>> So for experiment i change mtu 1500 on puppetmaster server on
>>> openstack but it didn't help. How do i fix this issue?
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