RE: DNS timeouts...
- From: "Thomas W Shinder" <tshinder@xxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Mon, 7 Feb 2005 15:52:37 -0600
Hi Ted,
You are correct. Also, if you are seeing those kind of timeouts, you
should do a trace to confirm that its indeed the DNS queries that are
slowing things down.
HTH,
Tom
www.isaserver.org/shinder
Tom and Deb Shinder's Configuring ISA Server 2004
http://tinyurl.com/3xqb7
MVP -- ISA Firewalls
-----Original Message-----
From: Ted Doholis [mailto:tdoholis@xxxxxxxxxxxxx]
Sent: Monday, February 07, 2005 3:26 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: DNS timeouts...
http://www.ISAserver.org
It was my understanding that you should not expose the internal DNS
servers to the net? That was the purpose of the caching only server.
Are there any documents that speak to this issue?
I don't understand 'wrong way for a shortcut'? I thought this was more
of 'the long way'
Ted Doholis
SaltSpring Software Inc.
-----Original Message-----
From: Steve Moffat [mailto:steve@xxxxxxxxxx]
Sent: Monday, February 07, 2005 4:18 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: DNS timeouts...
http://www.ISAserver.org
Wrong way for a shortcut....Allow DNS out for your DNS servers and watch
it speed up.
Take the caching dns server off The ISA Server.
S
-----Original Message-----
From: Ted Doholis [mailto:tdoholis@xxxxxxxxxxxxx]
Sent: Monday, February 07, 2005 5:09 PM
To: ISA Mailing List
Subject: [isalist] RE: DNS timeouts...
http://www.ISAserver.org
Internal clients query an AD DNS server...when the requested host is not
found, that server forwards to ISA which has a caching server installed
on it. The ISA server goes to the net and gets the record. There are no
zones on ISA except for stub zones for our internal domains otherwise it
recursively queries to the net.
It is allowed to the net (ISA).
Ted Doholis
SaltSpring Software Inc.
-----Original Message-----
From: Steve Moffat [mailto:steve@xxxxxxxxxx]
Sent: Monday, February 07, 2005 4:04 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: DNS timeouts...
http://www.ISAserver.org
Expand on caching server. You mean for the ISA Server??
You need to allow DNS queries out to the internet, if your clienta are
using your internal dns.
S
-----Original Message-----
From: Ted Doholis [mailto:tdoholis@xxxxxxxxxxxxx]
Sent: Monday, February 07, 2005 4:50 PM
To: ISA Mailing List
Subject: [isalist] RE: DNS timeouts...
http://www.ISAserver.org
For the caching server I am...not for the others. It will work, just
that it seems to respond to the client to slowly or something thus the
client gets the Access Message from ISA...
Ted Doholis
SaltSpring Software Inc.
-----Original Message-----
From: Steve Moffat [mailto:steve@xxxxxxxxxx]
Sent: Monday, February 07, 2005 3:47 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: DNS timeouts...
http://www.ISAserver.org
Are you allowing dns out for your dns server??
-----Original Message-----
From: Ted D [mailto:tdoholis@xxxxxxxxxxxxx]
Sent: Monday, February 07, 2005 5:01 PM
To: ISA Mailing List
Subject: [isalist] DNS timeouts...
http://www.ISAserver.org
I have ISA 2004 working perfectly except that occasionally the client
will get a message back that the Gateway could not find an authoritative
DNS server for the domain....
The client is querying an internal DNS and then it forwards to the
cahcing server on ISA. everything is local to the client so the speed
should be there....I was thinking of increasing the DNS server forwarder
timeout but it is currently set to 5 seconds which should be enough??
When I dont use ISA, the response is pretty fast and usually on the
second try to the site you get there so I'm not sure if this is the
right move.
Any ideas?
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