[Operators] DNS local caching resolvers

Dave Cridland dave at cridland.net
Wed Jan 20 16:13:33 CST 2010

FYI, during our testing in the run up to jabber.org this time, I  
happened to notice what an impact DNS is to S2S setups, and that  
running a local caching resolver is a huge help to an XMPP service.

It helps in two ways:

- It means that previously known queries respond much faster.

- It means bandwidth cost for connection establishment is much lower.

Of course, for most services it's not going to be a massive impact  
(and for big public deployments, you've probably already done this),  
but I thought I'd mention it while I remembered.

Dave Cridland - mailto:dave at cridland.net - xmpp:dwd at dave.cridland.net
  - acap://acap.dave.cridland.net/byowner/user/dwd/bookmarks/
  - http://dave.cridland.net/
Infotrope Polymer - ACAP, IMAP, ESMTP, and Lemonade

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