Re: Someone Please Help Me Understand

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

By performance testing, it varies, but latency is a big one. Again, doesn't seem to be your problem in your case. 




----- 
Mike Hammett 
Intelligent Computing Solutions 
http://www.ics-il.com 



Midwest Internet Exchange 
http://www.midwest-ix.com 


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

From: "Mike Hammett" <nanog () ics-il net> 
Cc: nanog () nanog org 
Sent: Saturday, April 2, 2016 2:55:24 PM 
Subject: Re: Someone Please Help Me Understand 

Well, what I meant by that (which wouldn't be the problem if you have them on-net), is that they'll do performance 
tests to your resolving DNS server to determine which node is the best node to serve you from. Well, they meaning other 
CDNs. I don't know how FB determines it. 

Are you seeing any routes to 32934 from your Chicago Equinix connection? 




----- 
Mike Hammett 
Intelligent Computing Solutions 
http://www.ics-il.com 



Midwest Internet Exchange 
http://www.midwest-ix.com 


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

From: "Eric Rogers" <ecrogers () precisionds com> 
To: "Mike Hammett" <nanog () ics-il net> 
Cc: nanog () nanog org 
Sent: Saturday, April 2, 2016 1:52:22 PM 
Subject: RE: Someone Please Help Me Understand 

Yes, we have our own Bind9 caching servers in different geographic locations, direct on fiber using SSD drives... Seem 
very quick when using GRC's DNS Benchmark tests. 

Eric Rogers 
PDS Connect 
(317) 831-3000 x200 

-----Original Message----- 
From: NANOG [mailto:nanog-bounces () nanog org] On Behalf Of Mike Hammett 
Sent: Saturday, April 2, 2016 2:01 PM 
Cc: nanog () nanog org 
Subject: Re: Someone Please Help Me Understand 

Are you using locally resolving DNS servers? I don't know how FB determines where your content comes from, but some 
CDNs test the performance to your resolving DNS server. 




----- 
Mike Hammett 
Intelligent Computing Solutions 
http://www.ics-il.com 



Midwest Internet Exchange 
http://www.midwest-ix.com 


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

From: "Eric Rogers" <ecrogers () precisionds com> 
To: nanog () nanog org 
Sent: Saturday, April 2, 2016 12:54:40 PM 
Subject: Someone Please Help Me Understand 

Ok, I'm trying to learn, so bear with me. 



We are an ISP in Indianapolis that has full routes from 3 different 
providers HE.Net in Columbus OH being one. We also are peered with 2 
peering exchanges, including EquinixIX in Chicago. The problem is 
Instagram and Facebook (same company, I know) for our customers seems 
very slow. 



This is where I need a way to troubleshoot/understand more. I did a 
traceroute to the IP that is serving the pictures, and it resolves to 
the FBCDN servers in Dallas, and is showing packet loss and pings once 
it hits Dallas, and are in the 1xxs of ms. 



Tracing route to instagram-p3-shv-01-dfw1.fbcdn.net [31.13.66.52] 

over a maximum of 30 hops: 



1 4 ms 3 ms 4 ms 10.7.0.1 

2 20 ms 43 ms 42 ms inmtvlobs-rtr-01.dynamic.pdsconnect.me 
[192.69.57.1] 

3 25 ms 47 ms 29 ms 
inmtvlmwt-rtr-01.infrastructure.pdsconnect.me [192.69.48.162] 

4 46 ms 32 ms 58 ms 
inindyhen-core1.infrastructure.pdsconnect.me [192.69.48.193] 

5 36 ms 53 ms 51 ms ge2-4.core1.cmh1.he.net [184.105.32.1] 

6 47 ms 41 ms 75 ms 10ge1-2.core1.chi1.he.net 
[184.105.222.165] 

7 57 ms 57 ms 53 ms 100ge14-1.core2.chi1.he.net 
[184.105.81.97] 

8 57 ms 73 ms 84 ms 100ge12-1.core1.mci3.he.net 
[184.105.81.209] 

9 75 ms 73 ms 102 ms 10ge15-6.core1.dal1.he.net 
[184.105.222.10] 

10 93 ms 103 ms 92 ms eqix-da1.facebook.com [206.223.118.176] 

11 102 ms 101 ms * psw01c.dfw1.tfbnw.net [173.252.65.196] 

12 92 ms 97 ms 105 ms msw1aq.01.dfw1.tfbnw.net [204.15.21.89] 

13 110 ms * 98 ms instagram-p3-shv-01-dfw1.fbcdn.net 
[31.13.66.52] 



Since I am peered with the route servers in EquinixIX Chicago, shouldn't 
the data be coming from there, or at least hit their routers? In my 
trace, it shows HE to Chicago, then to Dallas. How does FB decide what 
IP the content gets displayed from, and is there anything I can do as a 
provider? If it is DNS, I can obviously clear the cache to see if it 
gets new IPs. If I'm not getting FB peering IPs in Chicago, do I need 
to peer directly? Should I get FaceBook involved? 



Eric Rogers 

PDS Connect 

(317) 831-3000 x200