Re: DNS Negative Caching

2015-08-31 Thread Rich Goodson
I have a feeling that the discussion regarding SOA fields didn’t really answer your question, Harshith. Yes, negative results (NXDOMAIN) are usually cached for the amount of time specified in the last field of the SOA. This field was originally named “Minimum”, but is since used for NXDOMAIN TT

How does named log update request

2015-08-31 Thread liumingxing
hi, In my server, I found update need longer time, So I want to check why by checking logs. As we know, named Logging of all dynamic update transactions. In the update channel file, how I can know when the server receives update request? Mingxing, Liu mail:liumingx...@cnnic.cn tel:(

Re: DNS Negative Caching

2015-08-31 Thread Chris Buxton
On Aug 28, 2015, at 5:27 PM, Barry Margolin wrote: > Note that if a server is authoritative-only, caching is mostly > irrelevant, so the negative cache TTL doesn't much apply. In this case, > the SOA Minimum is just being used as the default TTL. No, that is not correct. When responding negati