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From Nux! <...@li.nux.ro>
Subject Re: Circumventing VXLAN MTU issues
Date Mon, 20 Nov 2017 18:38:13 GMT
Yeah, I changed the MTU to 9000 on the Guest network interface and connectivity is now fine
out of the box.
Hopefully I won't need to set jumbo frames in the VMs any time soon. :-)

Thanks for the tips.

Lucian

--
Sent from the Delta quadrant using Borg technology!

Nux!
www.nux.ro

----- Original Message -----
> From: "Simon Weller" <sweller@ena.com.INVALID>
> To: "users" <users@cloudstack.apache.org>
> Cc: "dev" <dev@cloudstack.apache.org>
> Sent: Monday, 20 November, 2017 17:36:31
> Subject: Re: Circumventing VXLAN MTU issues

> Change your host interface MTU to something a lot higher.
> 
> 
> ________________________________
> From: Nux! <nux@li.nux.ro>
> Sent: Monday, November 20, 2017 10:51 AM
> To: users
> Cc: dev
> Subject: Re: Circumventing VXLAN MTU issues
> 
> Hi,
> 
> I probably can use jumbo frames, but for now my lab is restricted to a single
> machine.
> Anything I can do in this situation?
> 
> --
> Sent from the Delta quadrant using Borg technology!
> 
> Nux!
> www.nux.ro
> 
> ----- Original Message -----
>> From: "Simon Weller" <sweller@ena.com.INVALID>
>> To: "dev" <dev@cloudstack.apache.org>, "users" <users@cloudstack.apache.org>
>> Sent: Monday, 20 November, 2017 16:38:33
>> Subject: Re: Circumventing VXLAN MTU issues
> 
>> Lucian,
>>
>> Can you run jumbos on your switches?
>>
>> - Si
>>
>>
>> ________________________________
>> From: Nux! <nux@li.nux.ro>
>> Sent: Monday, November 20, 2017 10:08 AM
>> To: dev
>> Cc: users
>> Subject: Circumventing VXLAN MTU issues
>>
>> Hello,
>>
>> I am playing around with the native VXLAN implementation and I have of course
>> hit the situation where MTU on the host gets chomped by 50 bytes and traffic
>> crawls to a stop in the VMs.
>> How are you people circumventing this? The easiest, but kind of inconvenient for
>> customers would be to set MTU 1450 inside the VM, though it could be baked into
>> the templates or via cloud-init.
>>
>> Is the OpenVSwitch implementation (of VXLAN) suffer from the same problem, I
>> understand ovs can dynamically adjust MTUs to compensate (?), but at the same
>> time this VXLAN implementation suffers from some limitations (multicast etc).
>>
>> Lucian
>>
>>
>> --
>> Sent from the Delta quadrant using Borg technology!
>>
>> Nux!
> > www.nux.ro

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