RE: Domain login through a NAT / FW?

["Benjamin Meade" <ben () lanwest com au>]

Unless you have reason for the current arrangement, move the domain
controller in front of the NAT box, and they should be able to connect
fine. It will also mean that you can log login attempts to your domain
by IP.

I can also vouch for squid. You will notice a HUGE difference in your
bandwidth use, and you also don't have to worry about sites like
friendgreetings.com. Just be aware that it will need a bit of tweaking
so your users can access the sites needed for work. 

Benjamin Meade
Systems Administrator
LanWest Pty Ltd


-----Original Message-----
From: Quentin Hartman [mailto:qhartman () lane k12 or us] 
Sent: Tuesday, 19 November 2002 2:36 AM
To: security-basics () securityfocus com
Subject: Domain login through a NAT / FW?

Colleagues-
         I am currently dealing with the following problems on a network
a 
recently inherited:

-Spurious bandwidth use (mostly from P2P applications) that is impacting

other critical applications
-Clients are using public IP's and running rogue services, which have no

legitimate need to.
-No way to contain problem machines

         I plan to address these issues by moving most of the clients 
behind IP-Tables based NAT servers / firewalls, BIND DNS caches, and 
(possibly) Squid web caches.
         One problem I am running into in testing this setup is that 
clients are not able to authenticate to the domain controller on the
other 
side of the NAT box. In writing this it occurred to me that I probably
need 
to setup the NAT machine as a WINS proxy. Am I on the right track? Do
any 
of you have suggestions for superior methods to address the problems 
mentioned above? Is there another list you would suggest posting this to

that may be more appropriate than this one? I have prayed to google 
repeatedly and not come up with anything relevant yet. The NAT boxes are

Linux Redhat 7.3, the domain controller is NT 4 (soon to be RH as well),

and the clients are windows 98se.


-Regards-

-Quentin Hartman-
Academic Computing and Networking Services Coordinator
Fern Ridge School District 28J
Elmira, OR
Office: 541-935-2253 x429
Cell: 541-914-2989
qhartman () lane k12 or us
www.fernridge.k12.or.us