Re: nike.com->nike.com/ca

["Dantzig, Brian" <bdantzig () medline com>]

When you send a DNS query to 8.8.8.8 it goes to the “nearest” resolver. Not nearest in terms of location since 8.8.8.8 
is an anycast address and exists in many locations. It’s the BGP path to 8.8.8.8 that determines nearest. Next, the 
resolver does it’s thing and sends a query to the akamai DNS. That DNS is probably also an anycast address so again, 
how close is it? Akamai then tries to geo locate you but they have the IP of Google, not you. You get an IP and connect 
to that. Everything up till now probably doesn’t matter as it’s probably not the DNS that is causing what you see. The 
IP is not Nike but rather an akamai proxy. When you connect to akamai proxy, the proxy can see your IP and may do the 
Geo location lookup and pass what it thinks as your location to the content server. When it gets to the content server, 
it may use that Geo information but possibly not. It’s likely it’s not the content server but a load balancer. In 
either case, they may ignore any Geo lookup done by akamai and try to locate the incoming IP. Well, that’s actually the 
address of the akamai proxy. Hopefully the developers thought of this and had akamai pass your IP in a header and geo 
locate on that. It’s probably the content server that is sending an HTTP redirect to get you to the “/ca” location on 
the site.

So there can be as many as 4 different times you are being geo-located. Which on actually matters is difficult to tell. 
Assuming Nike did a good job, it’s probably the Akamai proxy going the geo-locate and the code on the content server is 
consuming that and redirecting you to the location specific part of the site.


[Medline_Signiture2]<http://www.medline.com/?cmpid=eid:signature-logo-US-Sales>



Brian Dantzig
Senior Network Engineer
Information Services
Medline Industries, Inc.
www.medline.com<http://www.medline.com/?cmpid=eid:signature-link-US-Sales>


Office:  +1-847-837-2795
Mobile:+1-847-276-7169
bdantzig () medline com<mailto:bdantzig () medline com>





From: NANOG <nanog-bounces+bdantzig=medline.com () nanog org> on behalf of Mike Hammett <nanog () ics-il net>
Date: Thursday, January 7, 2021 at 7:40 AM
To: "Becki Kain (.)" <bkain1 () ford com>
Cc: "nanog () nanog org" <nanog () nanog org>
Subject: Re: nike.com->nike.com/ca

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________________________________
Don't use other people's recursive DNS servers.


-----
Mike Hammett
Intelligent Computing 
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________________________________
From: "Becki Kain (.)" <bkain1 () ford com>
To: nanog () nanog org
Sent: Wednesday, January 6, 2021 3:41:20 PM
Subject: nike.com->nike.com/ca
At home, using 8.8.8.8, if I goto 
www.nike.com<https://urldefense.com/v3/__http:/www.nike.com__;!!PoMpmxQzTok3!ux8PfKjcSqtK4NIlYhAFgw_77-3nVmlJpycBphh5cAH6N7iVD7qYTePDsvix-rpN$>,
 I get rerouted to nike.com/ca. I cleared the dns cache (I’m running Catalina macos) and rebooted just because.  Anyone 
else seen a weirdism on this?  thanks

Becki in Detroit