RE: ISA Server DNS Caching

From: "Thor \(Hammer of God\)" <thor@xxxxxxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Date: Thu, 19 Jan 2006 11:02:14 -0800

NDS behaviors?  You integrate with Novell now?

-----
"I'll see your Llama and up you a Badger."
John T

----- Original Message ----- From: "Jim Harrison" <Jim@xxxxxxxxxxxx> To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx> Sent: Thursday, January 19, 2006 9:44 AM Subject: [isalist] RE: ISA Server DNS Caching


http://www.ISAserver.org

ISA - what; 2000 or 2004?

Their NDS behaviors are quite different.


-------------------------------------------------------
  Jim Harrison
  MCP(NT4, W2K), A+, Network+, PCG
  http://isaserver.org/Jim_Harrison/
  http://isatools.org
  Read the help / books / articles!
-------------------------------------------------------


-----Original Message-----
From: Young, Gerald G [mailto:Gerald.Young@xxxxxxxxxx]
Sent: Thursday, January 19, 2006 09:34
To: [ISAserver.org Discussion List]
Subject: [isalist] ISA Server DNS Caching

http://www.ISAserver.org

I'm trying to get a better understanding of how the ISA Server deals with DNS queries and caching.

From what I've been able to discern, ISA Server will not use the local hosts file on the system (this configurable?) and instead grabs the record from the DNS server. However, changes made to the DNS server that propagate out, and are then returning the updated record through NSLOOKUP on the box for all DNS servers configured in the TCP/IP stack do not take immediately. The ISA logs still show the old IP address being used. Executing ipconfig /flushdns doesn't work, either. After about 15 minutes or so, ISA starts using the new DNS record.

This indicates that caching is going on someplace but I haven't been able to find any additional information on how or where ISA caches DNS records, nor can I find out how to clear that cache? Service restart, perhaps?

Any insight will be greatly appreciated.

Cordially yours,

Jerry G. Young II

 MCSE (4.0/W2K)

Atlanta EES Implementation Team Lead

HHS Engineering

Unisys

11493 Sunset Hills Rd.

Reston, VA 20190

Office: 703-579-2727

Cell: 703-625-1468

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RE: ISA Server DNS Caching

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