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From Nux! <...@li.nux.ro>
Subject Re: Circumventing VXLAN MTU issues
Date Thu, 21 Dec 2017 14:13:11 GMT
Thanks Andrija, well done, I have indeed read your document.
Using MTU 9000 solved my problem. :)

Lucian

--
Sent from the Delta quadrant using Borg technology!

Nux!
www.nux.ro

----- Original Message -----
> From: "Andrija Panic" <andrija.panic@gmail.com>
> To: "dev" <dev@cloudstack.apache.org>
> Cc: "users" <users@cloudstack.apache.org>
> Sent: Thursday, 21 December, 2017 14:09:43
> Subject: Re: Circumventing VXLAN MTU issues

> Hi Nux,
> 
> there is one rare contributions from my side :D to the ACS (documentation,
> 2.5 years ago) - check it here:
> http://docs.cloudstack.apache.org/en/latest/networking/vxlan.html#important-note-on-mtu-size
> 
> We are using it extensively, feel free to ask anything if needed.
> 
> Cheers
> 
> On 20 November 2017 at 19:38, Nux! <nux@li.nux.ro> wrote:
> 
>> 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
>>
> 
> 
> 
> --
> 
> Andrija Panić

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