RE: Interesting problem...
- From: "Steve Moffat" <steve@xxxxxxxxxx>
- To: "ISA Mailing List" <isalist@xxxxxxxxxxxxx>
- Date: Mon, 28 Feb 2005 15:35:57 -0400
The dns cache is local to the dns server...not AD integrated
S
________________________________
From: Ball, Dan [mailto:DBall@xxxxxxxxxxx]
Sent: Monday, February 28, 2005 2:04 PM
To: ISA Mailing List
Subject: [isalist] RE: Interesting problem...
http://www.ISAserver.org
I checked, and round-robin IS enabled, but since there aren't any
multiple IPs, I didn't think that'd make a difference.
All of the DNS servers were "supposed" to use the PDC as a forwarding
server, but apparently that particular server isn't. I checked, and
none of the other DNS servers have it as a forwarding server, but I
thought that since they were all Active Directory enabled, that was the
default configuration. Or at least that is the way it's been working
for a few years now. In fact, running searches of the ISA past history
log shows the other DNS servers contacting the PDC, but not the external
networks. It appears to be related solely to that one DNS server.
________________________________
From: Steve Moffat [mailto:steve@xxxxxxxxxx]
Sent: Monday, February 28, 2005 08:42
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Interesting problem...
http://www.ISAserver.org
You have round robin enabled???
All your dns servers will be doing DNS lookups to the internet, if you
want your other dns servers to resolve without going out to the internet
then the forwarder they need to use is your PDC.
S
________________________________
From: Ball, Dan [mailto:DBall@xxxxxxxxxxx]
Sent: Monday, February 28, 2005 9:33 AM
To: ISA Mailing List
Subject: [isalist] Interesting problem...
http://www.ISAserver.org
I've finally got most of the slowness out of our Internet access,
everyone was convinced it was due to our ISP, but I had suspicions when
our own published webserver was also slow. Based off of past
experiences, I kept looking at DNS as the most likely culprit, and I was
correct.
I have DNS servers installed on all our DCs, and only the PDC has
forwarding addresses in it, as that is the one that is supposed to
resolve all unknown addresses. While troubleshooting this slowness, I
couldn't find anything wrong, as all DNS queries appeared to be passing
through correctly. After awhile, I decided to again do an ISA log
search for DNS queries, but left the PDC off the filter (not sure why I
didn't do this to start with). I found that the second DNS on the local
subnet was attempting to resolve addresses using a whole bunch of
different IPs. After looking a little further, I realized that all of
the addresses it was attempting to reach were the "root hint" sites.
So, it was a simple fix, I just added the other DNS server to the policy
allowing DNS to pass through, and everything started to run slightly
faster. However, this doesn't really explain what exactly is wrong,
there does appears to be some sort of miscommunication between the DNS
servers.
Anyone have any idea where to start looking? I can't see anything
wrong, other than looking at the logs on the ISA server, everything
seems to be working fine.
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