Forwarders..........................................

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Guest

I have some W2K servers that ARE using forwarders and some other W2K servers
that ARE NOT using forwarders. Why in some cases I need the fowarders and
others I don't?

This is at some of my different client sites - for example.
Client "A" went from cable interent to a T-1. They never used forwarders,
but when we went to the T-1, I had to use forwarders in order for the PC's to
get on the internet. WHY?
 
I have some W2K servers that ARE using forwarders and some other W2K
servers that ARE NOT using forwarders. Why in some cases I need the
fowarders and others I don't?
Click to expand...

There's no "rule of thumb", in general I prefer setting up a
recursive DNS withouth using forwarders, by the way there
are exceptions, but in general, avoiding forwarders isn't
a bad thing at all
This is at some of my different client sites - for example.
Client "A" went from cable interent to a T-1. They never
used forwarders, but when we went to the T-1, I had to use
forwarders in order for the PC's to get on the internet. WHY?
Click to expand...

Hmm .. were you using forwarders before going on T-1 too ?
or were you using "root hints" ?


--

* ObiWan

Microsoft MVP: Windows Server - Networking
http://mvp.support.microsoft.com
http://italy.mvps.org
 
No, I wasn't using forwarders before the t-1 was installed - that's why I'm a
little confused.
 
No, I wasn't using forwarders before the t-1
was installed - that's why I'm a little confused.
Click to expand...

Now, this sounds really strange, if your DNS was working
before using root-hints, it should be able to work now too
the *only* thing which may stop it from working may be
either a DNS config change (e.g. the root-hints were deleted)
or a misconfiguration in the firewall which doesn't allow DNS
traffic as needed


--

* ObiWan

Microsoft MVP: Windows Server - Networking
http://mvp.support.microsoft.com
http://italy.mvps.org
 
ObiWan said:
Now, this sounds really strange, if your DNS was working
before using root-hints, it should be able to work now too
the *only* thing which may stop it from working may be
either a DNS config change (e.g. the root-hints were deleted)
or a misconfiguration in the firewall which doesn't allow DNS
traffic as needed


--

* ObiWan

Microsoft MVP: Windows Server - Networking
http://mvp.support.microsoft.com
http://italy.mvps.org
Click to expand...

Port 53 being blocked?

Matt
MCT, MCSE
 
Port 53 being blocked?
Click to expand...

Probably NOT completely blocked, the OP wrote that the
DNS is still working ... using forwarders, I wonder if the f/w
was configured to only allow traffic on 53 (UDP & TPC) to
the DNS servers used as forwarders, this would block
for sure any ability to setup a local recursive resolver
btw the above is just a guess... shooting in the dark ;-)

Regards


--

* ObiWan

Microsoft MVP: Windows Server - Networking

http://mvp.support.microsoft.com
http://italy.mvps.org
 
Why in some cases I need the fowarders and others I don't?
Only you can tell us.  The choice between using forwarding recursion and using "standard" recursion is a complex one that involves many criteria.  Only you can tell us which criteria outweigh the others in your particular situation.
 
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