[dns-operations] why 120s?

刘明星:) liumingxing at cnnic.cn
Wed Aug 17 07:16:19 UTC 2011

why is is deemed long enough time. Maybe it is too long or maybe too short. Bind recursor tells clients that authority is server failure before waiting for 30s without being responsed.  So it is deduced that Bind think 120 is too long. 



发件人: Mehmet Akcin 
发送时间: 2011-08-17  14:36:46 
收件人: 刘明星:) 
抄送: dns-operations 
主题: Re: [dns-operations] why 120s? 
I think it's just a default value because it's long enough time to determine a server has timed out.


On Aug 17, 2011, at 2:25 AM, 刘明星:) wrote:

According to rfc2308, if a server has not responded to an outstanding query within 120 seconds, the server may be deemed to be dead or unreachable.
I want to know why the limit time is set to 120s.


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