Re: [ovs-discuss] How does MTU work with tunnels?

2019-09-10 Thread Gregory Rose 



On 9/10/2019 7:07 AM, Heim, Dennis wrote:

Your MTU on VXLAN needs to allow for give or take around 50 bytes. Either, you 
would need to move up to larger frames (9k frames) or decrease your MTU on the 
end stations. If I could I would have enabled Jumbo frames, but that wasn't an 
option for various reasons. My understanding is by default you get 1500 byte 
ethernet frames. Then, you add tunnel overhead ~50 bytes, which varies between 
VXLAN, GENEVE, GRE. Then you get a packet with 1550 bytes. Your underlay 
network (physical network), needs to support MTU of 1550 or greater. Otherwise 
you get fragmentation, and unexpected performance. I am not a network engineer, 
so this is mostly what I learned through sleepless nights.

Dennis Heim | Domain Architect (Collaboration Labs)
World Wide Technology, Inc. | +1 314-212-1814


Recommended MTU for end stations on overlay network is 1600 bytes. See 
interalia:


https://cloudmaniac.net/nsx-t-things-to-know/

Begin quote ---
When leveraging encapsulation technologies, it is important to increase 
the MTU supported both on transport nodes as well as on all interfaces 
of the devices deployed in the physical network. For NSX-T, the 
documentation refers to a preferred MTU size of 1600 or above.


Actually, my personal recommendation is 9000: why bothering increasing 
to 1600 when you can do 9000? It’s only a maximum after all! :)


Different possible scenarios have different requirements:

When leveraging NSX-T only for the distributed firewall, you don’t need 
to increase the MTU. Nevertheless, I always recommend it for long-term 
plans (in case of network virtualization is introduced later).
When you want to carry overlay traffic for network virtualization, 
increasing the MTU to a minimum of 1600 bytes is recommended (same rule 
as NSX-V).


End quote---

I hope this helps.

- Greg





“The most powerful person in the world is the story teller. The storyteller 
sets the vision, values and agenda of an entire generation that is to come” – 
Steve Jobs
“Leadership isn’t a different maker. It is the difference maker” – Tim Kight
"Leaders who don't listen will eventually be surrounded by people who have nothing 
to say" --- Andy Stanley
"Worry less about who you might offend, and more about who you might inspire" 
-- Tim Allen
“Imagination is more important than knowledge.”  -- Albert Einstein
“If you can raise the level of effort and performance in those around you, you 
are officially a leader” – Urban Meyer
“The greatest danger for most of us is not that our aim is too high and we miss 
it, but that it is too low and we reach it.” -- Michelangelo Buonarroti
“Mediocore managers play checkers (assuming everyone is the same). Great 
managers play chess (acknowledging that everyone is unique)” – Marcus Buckingham
“If you’re not failing every now and again, it’s a sign you’re not doing 
anything very innovative” – Woody Allen

Click here to join me in my Collaboration Meeting Room

-Original Message-
From: Benjamin 
Sent: Tuesday, September 10, 2019 9:49 AM
To: Heim, Dennis ; ovs-discuss@openvswitch.org
Subject: Re: [ovs-discuss] How does MTU work with tunnels?

Thanks for your quick answer.

But i'm not sure I understand what you're saying: max MTU for VxLAN would be 
1320?

Le 10/09/2019 à 15:26, Heim, Dennis a écrit :

I run VXLAN over a DMVPN setup, as it is part of our Lab/PoC architecture 
(distributed). From an MTU perspective, Windows is happy with 1360, but some 
linux/apache servers require it set to 1320 to work properly.

Dennis Heim | Domain Architect (Collaboration Labs) World Wide
Technology, Inc. | +1 314-212-1814



"The most powerful person in the world is the story teller. The
storyteller sets the vision, values and agenda of an entire generation
that is to come" - Steve Jobs "Leadership isn't a different maker. It
is the difference maker" - Tim Kight "Leaders who don't listen will
eventually be surrounded by people who have nothing to say" --- Andy
Stanley "Worry less about who you might offend, and more about who you
might inspire" -- Tim Allen "Imagination is more important than
knowledge."  -- Albert Einstein "If you can raise the level of effort
and performance in those around you, you are officially a leader" -
Urban Meyer "The greatest danger for most of us is not that our aim is
too high and we miss it, but that it is too low and we reach it." --
Michelangelo Buonarroti "Mediocore managers play checkers (assuming
everyone is the same). Great managers play chess (acknowledging that
everyone is unique)" - Marcus Buckingham "If you're not failing every
now and again, it's a sign you're not doing anything very innovative"
- Woody Allen

Click here to join me in my Collaboration Meeting Room

-Original Message-
From: ovs-discuss-boun...@openvswitch.org
 On Behalf Of Benjamin
Sent: Tuesday, September 10, 2019 9:04 AM
To: ovs-discuss@openvswitch.org
Subject: [ovs-discus

Re: [ovs-discuss] VMware / NSX-T

2019-09-10 Thread Gregory Rose 
Please contact VMware directly - I'm sure they'll be happy to help with 
an NSX-T based solution and have the right field and sales engineers to 
get you started.


Thanks,

- Greg

On 9/10/2019 9:59 AM, Heim, Dennis wrote:


I have been using OvS to interconnect our various labs together. VXLAN 
tunnel connected to an Onos controller. The solution works, and does 
what it is supposed to do. However, if we could migrate to an NSX-T 
doing as the controller/management, I could probably get one of our 
internal IT groups to own it, and that would be what I want.  This 
would be used for our internal labs/PoC.


*Dennis Heim | Domain Architect (Collaboration Labs)*

World Wide Technology, Inc. | +1 314-212-1814

cid:image001.png@01D10DD2.7FC81F90 

cid:image002.png@01D10DD2.7FC81F90 
cid:image003.png@01D10DD2.7FC81F90 
cid:image004.png@01D10DD2.7FC81F90 



“The most powerful person in the world is the story teller. The 
storyteller sets the vision, values and agenda of an entire generation 
that is to come” – Steve Jobs


“Leadership isn’t a different maker. It is the difference maker” – Tim 
Kight


"Leaders who don't listen will eventually be surrounded by people who 
have nothing to say" --- Andy Stanley


"Worry less about who you might offend, and more about who you might 
inspire" -- Tim Allen


“Imagination is more important than knowledge.”  -- Albert Einstein

“If you can raise the level of effort and performance in those around 
you, you are officially a leader” – Urban Meyer


“The greatest danger for most of us is not that our aim is too high 
and we miss it, but that it is too low and we reach it.” -- 
Michelangelo Buonarroti


“Mediocore managers play checkers (assuming everyone is the same). 
Great managers play chess (acknowledging that everyone is unique)” – 
Marcus Buckingham


“If you’re not failing every now and again, it’s a sign you’re not 
doing anything very innovative” – Woody Allen


_Click here to join me in my Collaboration Meeting Room 
___


*From:*Gregory Rose 
*Sent:* Tuesday, September 10, 2019 12:14 PM
*To:* Heim, Dennis ; ovs-discuss@openvswitch.org
*Subject:* Re: [ovs-discuss] VMware / NSX-T

On 9/9/2019 5:47 AM, Heim, Dennis wrote:

Has anyone using VMware/NSX-T as the controller for Open vSwitch?


I've used NSX-T as the controller for OVS in non-production, 
test/development only type lab

environment.

Why do you ask?

- Greg


Thanks,

*Dennis Heim | Domain Architect (Collaboration Labs)*

World Wide Technology, Inc. | +1 314-212-1814

cid:image001.png@01D10DD2.7FC81F90 

cid:image002.png@01D10DD2.7FC81F90
cid:image003.png@01D10DD2.7FC81F90
cid:image004.png@01D10DD2.7FC81F90


“The most powerful person in the world is the story teller. The
storyteller sets the vision, values and agenda of an entire
generation that is to come” – Steve Jobs

“Leadership isn’t a different maker. It is the difference maker” –
Tim Kight

"Leaders who don't listen will eventually be surrounded by people
who have nothing to say" --- Andy Stanley

"Worry less about who you might offend, and more about who you
might inspire" -- Tim Allen

“Imagination is more important than knowledge.”  -- Albert Einstein

“If you can raise the level of effort and performance in those
around you, you are officially a leader” – Urban Meyer

“The greatest danger for most of us is not that our aim is too
high and we miss it, but that it is too low and we reach it.” --
Michelangelo Buonarroti

“Mediocore managers play checkers (assuming everyone is the same).
Great managers play chess (acknowledging that everyone is unique)”
– Marcus Buckingham

“If you’re not failing every now and again, it’s a sign you’re not
doing anything very innovative” – Woody Allen

_Click here to join me in my Collaboration Meeting Room
_



___

discuss mailing list

disc...@openvswitch.org  

https://mail.openvswitch.org/mailman/listinfo/ovs-discuss



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Re: [ovs-discuss] VMware / NSX-T

2019-09-10 Thread Heim, Dennis 
I have been using OvS to interconnect our various labs together. VXLAN tunnel 
connected to an Onos controller. The solution works, and does what it is 
supposed to do. However, if we could migrate to an NSX-T doing as the 
controller/management, I could probably get one of our internal IT groups to 
own it, and that would be what I want.  This would be used for our internal 
labs/PoC.

Dennis Heim | Domain Architect (Collaboration Labs)
World Wide Technology, Inc. | +1 314-212-1814
[cid:image001.png@01D10DD2.7FC81F90]
[cid:image002.png@01D10DD2.7FC81F90][cid:image003.png@01D10DD2.7FC81F90][cid:image004.png@01D10DD2.7FC81F90]

"The most powerful person in the world is the story teller. The storyteller 
sets the vision, values and agenda of an entire generation that is to come" - 
Steve Jobs
"Leadership isn't a different maker. It is the difference maker" - Tim Kight
"Leaders who don't listen will eventually be surrounded by people who have 
nothing to say" --- Andy Stanley
"Worry less about who you might offend, and more about who you might inspire" 
-- Tim Allen
"Imagination is more important than knowledge."  -- Albert Einstein
"If you can raise the level of effort and performance in those around you, you 
are officially a leader" - Urban Meyer
"The greatest danger for most of us is not that our aim is too high and we miss 
it, but that it is too low and we reach it." -- Michelangelo Buonarroti
"Mediocore managers play checkers (assuming everyone is the same). Great 
managers play chess (acknowledging that everyone is unique)" - Marcus Buckingham
"If you're not failing every now and again, it's a sign you're not doing 
anything very innovative" - Woody Allen

Click here to join me in my Collaboration Meeting 
Room

From: Gregory Rose 
Sent: Tuesday, September 10, 2019 12:14 PM
To: Heim, Dennis ; ovs-discuss@openvswitch.org
Subject: Re: [ovs-discuss] VMware / NSX-T


On 9/9/2019 5:47 AM, Heim, Dennis wrote:
Has anyone using VMware/NSX-T as the controller for Open vSwitch?

I've used NSX-T as the controller for OVS in non-production, test/development 
only type lab
environment.

Why do you ask?

- Greg



Thanks,

Dennis Heim | Domain Architect (Collaboration Labs)
World Wide Technology, Inc. | +1 314-212-1814
[cid:image001.png@01D10DD2.7FC81F90]
[cid:image002.png@01D10DD2.7FC81F90][cid:image003.png@01D10DD2.7FC81F90][cid:image004.png@01D10DD2.7FC81F90]

"The most powerful person in the world is the story teller. The storyteller 
sets the vision, values and agenda of an entire generation that is to come" - 
Steve Jobs
"Leadership isn't a different maker. It is the difference maker" - Tim Kight
"Leaders who don't listen will eventually be surrounded by people who have 
nothing to say" --- Andy Stanley
"Worry less about who you might offend, and more about who you might inspire" 
-- Tim Allen
"Imagination is more important than knowledge."  -- Albert Einstein
"If you can raise the level of effort and performance in those around you, you 
are officially a leader" - Urban Meyer
"The greatest danger for most of us is not that our aim is too high and we miss 
it, but that it is too low and we reach it." -- Michelangelo Buonarroti
"Mediocore managers play checkers (assuming everyone is the same). Great 
managers play chess (acknowledging that everyone is unique)" - Marcus Buckingham
"If you're not failing every now and again, it's a sign you're not doing 
anything very innovative" - Woody Allen

Click here to join me in my Collaboration Meeting 
Room




___

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disc...@openvswitch.org

https://mail.openvswitch.org/mailman/listinfo/ovs-discuss

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[ovs-discuss] Open vSwitch 2.12.0 Available

2019-09-10 Thread Justin Pettit 
The Open vSwitch team is pleased to announce the release of Open vSwitch 2.12.0:

http://openvswitch.org/releases/openvswitch-2.12.0.tar.gz

A few other feature highlights of 2.12.0 include:

- OpenFlow 1.5 required features are available and is now enabled by default.

- Support for match and set IPv6 ND options type and reserved fields.

- IPv4 and IPv6 fragmentation support for userspace conntrack.

- Linux kernel support up to 5.0.

- Experimental support for Linux AF_XDP mode.

- OVN support for Policy-Based Routing (PBR), IGMP Snooping and Querier, and 
IPAM improvements.

- And many others.  See the full change log here:

http://openvswitch.org/releases/NEWS-2.12.0

Please note that the OVS 2.12 series will be the last to include OVN as part of 
the distribution.  Future development of OVN is occurring outside of OVS in its 
own project:

https://github.com/ovn-org

Enjoy!

--The Open vSwitch Team   

   
Open vSwitch is a production quality, multilayer open source virtual switch. It 
is designed to enable massive network automation through programmatic 
extension, while still supporting standard management interfaces. Open vSwitch 
can operate both as a soft switch running within the hypervisor, and as the 
control stack for switching silicon. It has been ported to multiple 
virtualization platforms and switching chipsets.


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[ovs-discuss] 2.11.3, 2.10.4, 2.9.6, 2.8.8, 2.7.10, 2.6.7, and 2.5.9 Available

2019-09-10 Thread Justin Pettit 
The Open vSwitch team is pleased to announce a number of bug fix releases:

 http://openvswitch.org/releases/openvswitch-2.11.3.tar.gz

 http://openvswitch.org/releases/openvswitch-2.10.4.tar.gz

 http://openvswitch.org/releases/openvswitch-2.9.6.tar.gz

 http://openvswitch.org/releases/openvswitch-2.8.8.tar.gz

 http://openvswitch.org/releases/openvswitch-2.7.10.tar.gz

 http://openvswitch.org/releases/openvswitch-2.6.7.tar.gz

 http://openvswitch.org/releases/openvswitch-2.5.9.tar.gz

--The Open vSwitch Team 


Open vSwitch is a production quality, multilayer open source virtual switch. It 
is designed to enable massive network automation through programmatic 
extension, while still supporting standard management interfaces. Open vSwitch 
can operate both as a soft switch running within the hypervisor, and as the 
control stack for switching silicon. It has been ported to multiple 
virtualization platforms and switching chipsets.


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Re: [ovs-discuss] VMware / NSX-T

2019-09-10 Thread Gregory Rose 


On 9/9/2019 5:47 AM, Heim, Dennis wrote:


Has anyone using VMware/NSX-T as the controller for Open vSwitch?



I've used NSX-T as the controller for OVS in non-production, 
test/development only type lab

environment.

Why do you ask?

- Greg


Thanks,

*Dennis Heim | Domain Architect (Collaboration Labs)*

World Wide Technology, Inc. | +1 314-212-1814

cid:image001.png@01D10DD2.7FC81F90 

cid:image002.png@01D10DD2.7FC81F90 
cid:image003.png@01D10DD2.7FC81F90 
cid:image004.png@01D10DD2.7FC81F90 



“The most powerful person in the world is the story teller. The 
storyteller sets the vision, values and agenda of an entire generation 
that is to come” – Steve Jobs


“Leadership isn’t a different maker. It is the difference maker” – Tim 
Kight


"Leaders who don't listen will eventually be surrounded by people who 
have nothing to say" --- Andy Stanley


"Worry less about who you might offend, and more about who you might 
inspire" -- Tim Allen


“Imagination is more important than knowledge.”  -- Albert Einstein

“If you can raise the level of effort and performance in those around 
you, you are officially a leader” – Urban Meyer


“The greatest danger for most of us is not that our aim is too high 
and we miss it, but that it is too low and we reach it.” -- 
Michelangelo Buonarroti


“Mediocore managers play checkers (assuming everyone is the same). 
Great managers play chess (acknowledging that everyone is unique)” – 
Marcus Buckingham


“If you’re not failing every now and again, it’s a sign you’re not 
doing anything very innovative” – Woody Allen


_Click here to join me in my Collaboration Meeting Room 
___



___
discuss mailing list
disc...@openvswitch.org
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Re: [ovs-discuss] How does MTU work with tunnels?

2019-09-10 Thread Heim, Dennis 
Your MTU on VXLAN needs to allow for give or take around 50 bytes. Either, you 
would need to move up to larger frames (9k frames) or decrease your MTU on the 
end stations. If I could I would have enabled Jumbo frames, but that wasn't an 
option for various reasons. My understanding is by default you get 1500 byte 
ethernet frames. Then, you add tunnel overhead ~50 bytes, which varies between 
VXLAN, GENEVE, GRE. Then you get a packet with 1550 bytes. Your underlay 
network (physical network), needs to support MTU of 1550 or greater. Otherwise 
you get fragmentation, and unexpected performance. I am not a network engineer, 
so this is mostly what I learned through sleepless nights.

Dennis Heim | Domain Architect (Collaboration Labs)
World Wide Technology, Inc. | +1 314-212-1814



“The most powerful person in the world is the story teller. The storyteller 
sets the vision, values and agenda of an entire generation that is to come” – 
Steve Jobs
“Leadership isn’t a different maker. It is the difference maker” – Tim Kight
"Leaders who don't listen will eventually be surrounded by people who have 
nothing to say" --- Andy Stanley
"Worry less about who you might offend, and more about who you might inspire" 
-- Tim Allen
“Imagination is more important than knowledge.”  -- Albert Einstein
“If you can raise the level of effort and performance in those around you, you 
are officially a leader” – Urban Meyer
“The greatest danger for most of us is not that our aim is too high and we miss 
it, but that it is too low and we reach it.” -- Michelangelo Buonarroti
“Mediocore managers play checkers (assuming everyone is the same). Great 
managers play chess (acknowledging that everyone is unique)” – Marcus Buckingham
“If you’re not failing every now and again, it’s a sign you’re not doing 
anything very innovative” – Woody Allen

Click here to join me in my Collaboration Meeting Room

-Original Message-
From: Benjamin  
Sent: Tuesday, September 10, 2019 9:49 AM
To: Heim, Dennis ; ovs-discuss@openvswitch.org
Subject: Re: [ovs-discuss] How does MTU work with tunnels?

Thanks for your quick answer.

But i'm not sure I understand what you're saying: max MTU for VxLAN would be 
1320?

Le 10/09/2019 à 15:26, Heim, Dennis a écrit :
> I run VXLAN over a DMVPN setup, as it is part of our Lab/PoC architecture 
> (distributed). From an MTU perspective, Windows is happy with 1360, but some 
> linux/apache servers require it set to 1320 to work properly.
>
> Dennis Heim | Domain Architect (Collaboration Labs) World Wide 
> Technology, Inc. | +1 314-212-1814
>
>
>
> "The most powerful person in the world is the story teller. The 
> storyteller sets the vision, values and agenda of an entire generation 
> that is to come" - Steve Jobs "Leadership isn't a different maker. It 
> is the difference maker" - Tim Kight "Leaders who don't listen will 
> eventually be surrounded by people who have nothing to say" --- Andy 
> Stanley "Worry less about who you might offend, and more about who you 
> might inspire" -- Tim Allen "Imagination is more important than 
> knowledge."  -- Albert Einstein "If you can raise the level of effort 
> and performance in those around you, you are officially a leader" - 
> Urban Meyer "The greatest danger for most of us is not that our aim is 
> too high and we miss it, but that it is too low and we reach it." -- 
> Michelangelo Buonarroti "Mediocore managers play checkers (assuming 
> everyone is the same). Great managers play chess (acknowledging that 
> everyone is unique)" - Marcus Buckingham "If you're not failing every 
> now and again, it's a sign you're not doing anything very innovative" 
> - Woody Allen
>
> Click here to join me in my Collaboration Meeting Room
>
> -Original Message-
> From: ovs-discuss-boun...@openvswitch.org 
>  On Behalf Of Benjamin
> Sent: Tuesday, September 10, 2019 9:04 AM
> To: ovs-discuss@openvswitch.org
> Subject: [ovs-discuss] How does MTU work with tunnels?
>
> Hi all,
>
> I working with openvswitch 2.5.3 (tried with 2.11.0 same behavior) on XCP-ng 
> (XenServer fork).
>
> I'm trying to undersand how the mtu works with GRE and VxLAN tunnels.
> As for now when I create a GRE tunnel with any MTU, I think the MTU is not 
> taken in consideration because i can ping -s 15000 on the corresponding 
> interface.
> However, with VxLAN if I set a MTU greater than 1450 then the MTU is
> 1450 and if I set a MTU lower than 1450 I have same behavior as for GRE.
>
> So I'm a but confused.
>
> When I check the mtu value with : ovs-vsctl get int xapi0 mtu_request or 
> ovs-vsctl get int xapi0 mtu the returned value is what I expect.
>
>
> Thanks in advance,
>
> Benjamin
> ___
> discuss mailing list
> disc...@openvswitch.org
> https://mail.openvswitch.org/mailman/listinfo/ovs-discuss

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Re: [ovs-discuss] How does MTU work with tunnels?

2019-09-10 Thread Benjamin 

Thanks for your quick answer.

But i'm not sure I understand what you're saying: max MTU for VxLAN 
would be 1320?


Le 10/09/2019 à 15:26, Heim, Dennis a écrit :

I run VXLAN over a DMVPN setup, as it is part of our Lab/PoC architecture 
(distributed). From an MTU perspective, Windows is happy with 1360, but some 
linux/apache servers require it set to 1320 to work properly.

Dennis Heim | Domain Architect (Collaboration Labs)
World Wide Technology, Inc. | +1 314-212-1814



"The most powerful person in the world is the story teller. The storyteller sets the 
vision, values and agenda of an entire generation that is to come" - Steve Jobs
"Leadership isn't a different maker. It is the difference maker" - Tim Kight
"Leaders who don't listen will eventually be surrounded by people who have nothing 
to say" --- Andy Stanley
"Worry less about who you might offend, and more about who you might inspire" 
-- Tim Allen
"Imagination is more important than knowledge."  -- Albert Einstein
"If you can raise the level of effort and performance in those around you, you are 
officially a leader" - Urban Meyer
"The greatest danger for most of us is not that our aim is too high and we miss it, 
but that it is too low and we reach it." -- Michelangelo Buonarroti
"Mediocore managers play checkers (assuming everyone is the same). Great managers 
play chess (acknowledging that everyone is unique)" - Marcus Buckingham
"If you're not failing every now and again, it's a sign you're not doing anything 
very innovative" - Woody Allen

Click here to join me in my Collaboration Meeting Room

-Original Message-
From: ovs-discuss-boun...@openvswitch.org  
On Behalf Of Benjamin
Sent: Tuesday, September 10, 2019 9:04 AM
To: ovs-discuss@openvswitch.org
Subject: [ovs-discuss] How does MTU work with tunnels?

Hi all,

I working with openvswitch 2.5.3 (tried with 2.11.0 same behavior) on XCP-ng 
(XenServer fork).

I'm trying to undersand how the mtu works with GRE and VxLAN tunnels.
As for now when I create a GRE tunnel with any MTU, I think the MTU is not 
taken in consideration because i can ping -s 15000 on the corresponding 
interface.
However, with VxLAN if I set a MTU greater than 1450 then the MTU is
1450 and if I set a MTU lower than 1450 I have same behavior as for GRE.

So I'm a but confused.

When I check the mtu value with : ovs-vsctl get int xapi0 mtu_request or 
ovs-vsctl get int xapi0 mtu the returned value is what I expect.


Thanks in advance,

Benjamin
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discuss mailing list
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https://mail.openvswitch.org/mailman/listinfo/ovs-discuss


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Re: [ovs-discuss] How does MTU work with tunnels?

2019-09-10 Thread Heim, Dennis 
I run VXLAN over a DMVPN setup, as it is part of our Lab/PoC architecture 
(distributed). From an MTU perspective, Windows is happy with 1360, but some 
linux/apache servers require it set to 1320 to work properly. 

Dennis Heim | Domain Architect (Collaboration Labs)
World Wide Technology, Inc. | +1 314-212-1814



"The most powerful person in the world is the story teller. The storyteller 
sets the vision, values and agenda of an entire generation that is to come" - 
Steve Jobs
"Leadership isn't a different maker. It is the difference maker" - Tim Kight
"Leaders who don't listen will eventually be surrounded by people who have 
nothing to say" --- Andy Stanley
"Worry less about who you might offend, and more about who you might inspire" 
-- Tim Allen
"Imagination is more important than knowledge."  -- Albert Einstein
"If you can raise the level of effort and performance in those around you, you 
are officially a leader" - Urban Meyer
"The greatest danger for most of us is not that our aim is too high and we miss 
it, but that it is too low and we reach it." -- Michelangelo Buonarroti
"Mediocore managers play checkers (assuming everyone is the same). Great 
managers play chess (acknowledging that everyone is unique)" - Marcus Buckingham
"If you're not failing every now and again, it's a sign you're not doing 
anything very innovative" - Woody Allen

Click here to join me in my Collaboration Meeting Room

-Original Message-
From: ovs-discuss-boun...@openvswitch.org  
On Behalf Of Benjamin
Sent: Tuesday, September 10, 2019 9:04 AM
To: ovs-discuss@openvswitch.org
Subject: [ovs-discuss] How does MTU work with tunnels?

Hi all,

I working with openvswitch 2.5.3 (tried with 2.11.0 same behavior) on XCP-ng 
(XenServer fork).

I'm trying to undersand how the mtu works with GRE and VxLAN tunnels.
As for now when I create a GRE tunnel with any MTU, I think the MTU is not 
taken in consideration because i can ping -s 15000 on the corresponding 
interface.
However, with VxLAN if I set a MTU greater than 1450 then the MTU is
1450 and if I set a MTU lower than 1450 I have same behavior as for GRE.

So I'm a but confused.

When I check the mtu value with : ovs-vsctl get int xapi0 mtu_request or 
ovs-vsctl get int xapi0 mtu the returned value is what I expect.


Thanks in advance,

Benjamin
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[ovs-discuss] How does MTU work with tunnels?

2019-09-10 Thread Benjamin 

Hi all,

I working with openvswitch 2.5.3 (tried with 2.11.0 same behavior) on 
XCP-ng (XenServer fork).


I'm trying to undersand how the mtu works with GRE and VxLAN tunnels.
As for now when I create a GRE tunnel with any MTU, I think the MTU is 
not taken in consideration because i can ping -s 15000 on the 
corresponding interface.
However, with VxLAN if I set a MTU greater than 1450 then the MTU is 
1450 and if I set a MTU lower than 1450 I have same behavior as for GRE.


So I'm a but confused.

When I check the mtu value with : ovs-vsctl get int xapi0 mtu_request or 
ovs-vsctl get int xapi0 mtu the returned value is what I expect.



Thanks in advance,

Benjamin
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disc...@openvswitch.org
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