How See what is Cached?

[Agarwal Vivek-RNGB36]

Hi All

Iam trying to run the same command on Red Hat Linux; but its not giving any output. 
How can I check the cache in the redhat linux

Regards
Vivek Aggarwal
+973-36583058 


-----Original Message-----
From: bind-users-bounces at lists.isc.org [mailto:bind-users-bounces at lists.isc.org] On Behalf Of Alans
Sent: Tuesday, July 07, 2009 9:51 AM
To: 'Niall O'Reilly'
Cc: bind-users at lists.isc.org
Subject: RE: How See what is Cached?

It is an ISP DNS, when they test the second DNS (advertised as secondary for customers), when they test they noticed that it is a little bit slow when opening same websites comparing to first DNS (primary), this happens only first time they open the website then it will be fine (because caching)..

Now, they do have DHCP clients, I'll put the second DNS for them and see if there is any difference.

Thanks everyone,
Alans


JINMEI Tatuya / 神明達哉 wrote
(but my comment is for the OP, AlanS):

> If the reason is due to client-side server
> selection algorithm (many Unix based resolvers only uses the first
> address in /etc/resolv.conf as long as it responds to their queries),
> there's basically nothing you can do as the server side operator.

	If you also operate the DHCP server(s) from which
	the clients obtain the data to put in /etc/resolv.conf,
	you can try to balance the resolver load by tuning the
	DHCP advertisements.

	No-one on the list can really advise whether this would be
	useful, as you don't say what problem you're trying to solve,


	Best regards,

	Niall O'Reilly
	University College Dublin IT Services

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