[afnog] MTU Size for transit links for ISPs

[Mohamed Faye]

Hey Luc,

I will also go with the idea that you should have the same MTU size with your upstream. but as Johan Bernhardsson said they might be some better Network ninja's with much better idea on this.

Regards,
- Mohamed faye

----- Original Message -----
From: "Johan Bernhardsson" <johan at kafit.se>
To: "Luc Perreau" <Luc.Perreau at cwseychelles.com>
Cc: afnog at afnog.org
Sent: Friday, September 20, 2013 7:47:21 AM
Subject: Re: [afnog] MTU Size for transit links for ISPs

Hello,

In my experience its best that both sides has the same MTU size set.

But i bet that some that is a better network ninja than me knows it
better than me :)

/Johan Bernhardsson



On fre, 2013-09-20 at 07:11 +0000, Perreau, Luc wrote:
> Hi all,
> 
>  
> 
> We have been working with POS interfaces for a while and with no
> issues at all. Our MTU size is always set to 4500.
> 
>  
> 
> However, we have recently installed some Ethernet links with default
> MTU size of 1500. These are STM1 size links and we found that there is
> degraded performance on browsing and download, but P2P torrent traffic
> is not affected.
> 
>  
> 
> What is the best way forward to confirm that it is an MTU issue, and
> if so, what is the best MTU size to set? Jumbo (9000) or mutually
> agreed size with the transit provider?
> 
>  
> 
> Your assistance would be greatly appreciated.
> 
>  
> 
> regards
> 
>  
> 
> Luc Perreau
> 
> 
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