Am 20.10.2015 um 13:26 schrieb Steven Carr:
On 20 October 2015 at 10:41, Phil Mayers <p.may...@imperial.ac.uk> wrote:On 20/10/15 07:26, Harshith Mulky wrote:How can a Client verify if the DNS Server is Running(named service is Running) or Down?By the presence or absence of a reply to a query.That doesn't always verify if the server is running or not, your client might not be allowed to query it, in which case you may get a refused response, or it may just not respond to you at all.
and the client can distinct NXDOMAIN, REFUSED, no connection at all
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