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What is the different between internal DNS and external DNS?

How do you scale a recursive DNS resolver, and what are your issues with this?

  • How do you scale a recursive DNS to support clients doing lots and lots of DNS requests? Clients could be DNS-heavy beasts like a web crawler, doing requests for lots of different host names: cache misses are higher than cache hits, and given the average low TTLs, the cache expires multiple times a day. So pretty much all requests go to the upstream server, and issues happen here: many hostnames have the same DNS servers (GoDaddy's, Wordpress's, etc) or are on the same network. You get rate-limited by upstream servers (lots of DNS requests coming from the same host - is it a DNS-reflection attack?), by your hosting service (are you running a DNS-reflection attack?), and by everything in the middle.

  • Answer:

    Just set up multiple servers you claimed to have when you register the domain.... DNS will automatically load balance between them.... if you need something more then use traditional load balancing

Aryeh Friedman at Quora Visit the source

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To scale resolvers should not be needed under normal circumstances. DNS servers do have a quite good cache management. But if you are experiencing problems here are some ideas: - clients support several resolvers. Set up three or more resolvers and give a list of resolvers to your clients - give every client a local resolver (forwarding only). If a client crawls one website at a time it will ask for the same information a lot of times and get it faster from a local cache. This will lower pressure on your resolvers. - Depending on the use patterns more memory (more cache) for your resolvers could be a good idea.

Ulrich Wisser

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