resolver change?

Robert Watson rwatson at
Mon Jan 28 01:08:28 PST 2008

On Mon, 28 Jan 2008, Dag-Erling Smørgrav wrote:

> Robert Watson <rwatson at> writes:
>> On the grounds that paranoia is clearly better, my suggestion at this point 
>> would be to run tcpdump between the caching resolver and ntpd and see what 
>> is actually going on the wire.
> In this case, they're on the same machine.  I'm not sure how well tcpdump 
> works on loopback devices...

It should work just fine.  Make sure to use -vvv so you get all the details.

>> The name server should be rotating them in reply, and it would be good to 
>> confirm that it's doing that.
> The results from host(1) seem to indicate that it does.
>> It would also be good to check that it's looking up what you think it's 
>> looking up, and indeed, what it should be looking at.
> Not sure what you mean by this...

I'm sure I don't have to tell you that when debugging, it's good to look under 
the hood to see what's actually happening, as one misunderstanding can waste 
hours of time chasing the wrong lead.

Robert N M Watson
Computer Laboratory
University of Cambridge

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