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DNS response alteration?

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DNS response alteration? - 26.Jan.2005 6:36:00 PM   
jmunyan

 

Posts: 803
Joined: 3.Feb.2001
From: Seattle, WA
Status: offline
Anyone aware of ISA server changing DNS responses from a protected dns server? I have changed the location of a server from behind ISA to an alternate location. The dns server has had it's A record changed to point to the new server location. I have tested this internally with nslookup and the correct response is returned.

From the front of isa however, the old record is returned. I have restarted dns and even booted the box. The problem persists. I think ISA is somehow mucking with the response. Using nslookup from the front returns an incorrect resolutions.

I read ISA does some dns caching - and the rule formerly used to publish said webserver is still in effect. Is this causing ISA to return incorrect name resolutions? "[Confused]"

Thanks,

John
Post #: 1
RE: DNS response alteration? - 27.Jan.2005 2:02:00 AM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
Hi John,

Now, that is pretty whack. I'd definitely do a NetMon trace to make sure the request actually made it to the DNS server behind the ISA firewall and that the response was actually the one returned from the published DNS server. I've published DNS servers and haven't seen this.

Tom

(in reply to jmunyan)
Post #: 2
RE: DNS response alteration? - 27.Jan.2005 1:26:00 PM   
penrose.l@2college.nl

 

Posts: 474
Joined: 29.Jan.2004
From: Netherlands
Status: offline
Hi ,

DNS is quite persistant in W2K3.

Use : ipconfig /flushdns

on all machines that need DNS ( so at least your ISA server , your client AND your Domain controllers ( all of them )

Or wait 8 hours [Smile]

LexP

(in reply to jmunyan)
Post #: 3

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