FYI, you may be hampered by the annoying habit of CDNs to have no reverse DNS on their IP addresses. It may come up ntflxvideo, 1e100, tfbnw, akamaitechnologies, llnw, etc., but a large percentage of the time there will be no rDNS at all. So you have to infer from a traceroute like in Mike’s post.
From: Mike Hammett Sent: Monday, March 23, 2015 12:23 PM To: [email protected] Subject: Re: [AFMUG] testing DNS server performance Then do what I already told you to do. You'll see what's happening, Jesus. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com -------------------------------------------------------------------------------- From: "That One Guy" <[email protected]> To: [email protected] Sent: Monday, March 23, 2015 12:16:27 PM Subject: Re: [AFMUG] testing DNS server performance Im not wanting to alter anything, I just want to see, jesus On Mon, Mar 23, 2015 at 12:10 PM, Mike Hammett <[email protected]> wrote: You can register with every geolocation service known to man and places still find ways to place you incorrectly. I've got a new one now. ShadowServer thinks I'm in Glen Ellyn. The IP block has never been in or near Glen Ellyn. One could assume that the middle of a week day is a light NetFlix time and that they would be pointing you to the nearest location. If they thought he was in Albuquerque, that could make optimal routing a bit difficult. It wouldn't just be the gross latency, but the number of peering points and hops with potential congestion issues. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com ------------------------------------------------------------------------------ From: "Ken Hohhof" <[email protected]> To: [email protected] Sent: Monday, March 23, 2015 12:05:29 PM Subject: Re: [AFMUG] testing DNS server performance I also don’t know how important it is that a CDN be “near” you. By definition, you’re probably talking a sustained download, either a video stream or some kind of large file download. And most of the time you will see 4 parallel TCP connections. I really don’t think latency matters once you start the download. What does matter is server balancing. If your DNS server has correct geoIP but Netflix chooses to send your customers to a server in Dallas, maybe their Chicago servers are overloaded or undergoing maintenance. Do you really want to second guess their decisions? About all you can do is make sure your DNS server is in the right place according to the geolocation database services, and let the content provider decide what IP address to hand out to your customers and how to route that IP (they may use geoIP info to decide the routing, not the DNS). Now, if your DNS server appears to be in a whole wrong part of the world, that may have dramatic effects, like totally different content being available because Netflix thinks your customer is in Europe or Asia. From: Mike Hammett Sent: Monday, March 23, 2015 11:55 AM To: [email protected] Subject: Re: [AFMUG] testing DNS server performance Pardon the mess, I'm on a laptop with a damn touchpad. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com ------------------------------------------------------------------------------ From: "That One Guy" <[email protected]> To: [email protected] Sent: Monday, March 23, 2015 11:43:50 AM Subject: Re: [AFMUG] testing DNS server performance used the wrong term Ignore the term Take cache out of thyne mouth now, being a windows dick, I dont have torch I want to simply be able to verify that appropriate CDNs are being utilized namebench is still running, I dont know what its output is going to be This cant be a new thing, I see threads occasionally about content being problematic in that users are getting less than desirable CDNs, it always seems to boil down to DNS, I just want a tool that will tell me where the content is coming from. (in a perfect world, it would display on a map with a quality indicator to that CDN, I dont have any expectation that that component of the tool would exist) On Mon, Mar 23, 2015 at 11:34 AM, Chuck McCown <[email protected]> wrote: Not generic. You have to use the one they provide. And they will not give to you unless you are doing some like 4tB per month. From: Ken Hohhof Sent: Monday, March 23, 2015 10:33 AM To: [email protected] Subject: Re: [AFMUG] testing DNS server performance I was not aware you could cache Netflix streams with a generic caching server. Not only due to DRM, but also Netflix app switches streams dynamically to match video quality to connection speed. Plus first the customer authenticates to Netflix server, chooses what content to watch, etc. From: Chuck McCown Sent: Monday, March 23, 2015 11:23 AM To: [email protected] Subject: Re: [AFMUG] testing DNS server performance Say a new movie is on Netflix. Or latest season of cards. Everyone is going to want to watch it. So 1000 simultaneous backbone streams to Netflix vs 1000 simultaneous streams to the caching server in your NOC. I choose the latter. ---------------------------------------------------------------------------- From: "Ken Hohhof" <[email protected]> To: [email protected] Sent: Monday, March 23, 2015 11:08:27 AM Subject: Re: [AFMUG] testing DNS server performance I don’t understand how the caching server is going to help with CDNs. Actually, with so much Internet content now being either dynamic HTML or streaming, I wouldn’t think caching would be worth it, unless you are talking about something like a Netflix OpenConnect appliance. Maybe you can cache software updates, I’m not sure about that. From: That One Guy Sent: Monday, March 23, 2015 10:35 AM To: [email protected] Subject: Re: [AFMUG] testing DNS server performance Geographically close CDNs. I want to make sure we are getting content from Illinoisish rather than california for netflix, since all that matters is netflix On Mon, Mar 23, 2015 at 10:30 AM, Josh Baird <[email protected]> wrote: For performance, look at queryperf which I think is provided by ISC/bind. I'm not sure what you mean by "we are getting good CDNs and the like," though. Josh On Mon, Mar 23, 2015 at 11:27 AM, That One Guy <[email protected]> wrote: Im bringing live our first caching server today. Is there a good tool for comparing queries between DNS servers. Im not all that concerned about speed since we are so small there wont be a huge amount of benefit I would think. Im primarily wanting to make sure we are getting good CDNs and the like -- If you only see yourself as part of the team but you don't see your team as part of yourself you have already failed as part of the team. -- If you only see yourself as part of the team but you don't see your team as part of yourself you have already failed as part of the team. -- If you only see yourself as part of the team but you don't see your team as part of yourself you have already failed as part of the team. -- If you only see yourself as part of the team but you don't see your team as part of yourself you have already failed as part of the team.
