Re: Facebook more specific via Level3 ?

[Mike Hammett <nanog () ics-il net>]

Are your DNS resolvers on your network? No DNS forwarding? 




----- 
Mike Hammett 
Intelligent Computing Solutions 

Midwest Internet Exchange 

The Brothers WISP 

----- Original Message -----

From: "Radu-Adrian Feurdean" <nanog () radu-adrian feurdean net> 
To: "Jürgen Jaritsch" <juergen () jaritsch at>, "Doug Porter" <dsp () fb com>, nanog () nanog org 
Sent: Wednesday, March 22, 2017 5:02:12 AM 
Subject: Re: Facebook more specific via Level3 ? 

On Tue, Mar 21, 2017, at 20:38, Jürgen Jaritsch wrote: 

> I understand that FB is using some type of DNS geo-loadbalancing and other 
> mechanism to redirect users to (possibly) nearer mirrors. The used DNS is 
> directly requesting the root DNS and not any other public DNS (e.g. not 
> 8.8.8.8). Running some requests within 3 minutes gives me the below 
> results: 
>
> www.facebook.com => star-mini.c10r.facebook.com. => 31.13.77.36 
> www.facebook.com => star-mini.c10r.facebook.com. => 157.240.2.35 
> www.facebook.com => star-mini.c10r.facebook.com. => 31.13.93.36 
> www.facebook.com => star-mini.c10r.facebook.com. => 31.13.76.68 

Hi, the load-balancing definitely doesn't choose the *nearest* mirror. 
We are in France and unless we do dirty tricks, we *always* get directed 
to US sites (as far as LA), with horrible performance. Everything since 
end of December. As a consequence we let the dirty tricks in place 
(query facebook.com and fbcdn.com on 8.8.8.8 instead of regular 
recursive resolving) and we get directed to Frankfurt or Amsterdam 
(never London or Paris).