Security Basics mailing list archives
RE: Securing a Win2k DNS server outside firewall...
From: "dave" <dave () netmedic net>
Date: Fri, 6 Jun 2003 16:53:39 -0400
IF all it is a DNS server then: Go to Network Properties; Properties of the NIC you are protecting; Leave only TCP/IP selected; Highlight TCP/IP and Select properties; Select advanced; Select the WINS tab; Select Disable NetBIOS over TCP/IP; Select Options; Select TCP/IP Filtering Properties; Select Enable TCP/IP Filtering for All Adapters; Select Permit Only in all three boxes; TCP add 53,1026,1027,1028,1029 UDP add 53,1026,1027,1028,1029 IP Proto add 6 Reboot and that is it. You can verify it in Regedt32 by looking under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interf aces\{00000000-0000-0000-0000-000000000000} (the external interface) RawIPAllowedProtocols:REG_MULTI-SZ:6 TCPAllowedPorts:REG_MULTI-SZ:53,1026,1027,1028,1029 UDPAllowedPorts:REG_MULTI-SZ:53,1026,1027,1028,1029 Now everyone is going to start bitching about what are the UDP ports for 1026 etc...... the answer is, I do not know but by playing around with this, it is the configuration I got to work. I have 3 DNS servers running in this configuration. Also you can add 20,21 and 80,443 and IIS and FTP can run on them. Dave _____________________ Dave Kleiman dave () netmedic net www.netmedic.net -----Original Message----- From: beartman () thoughtworks com [mailto:beartman () thoughtworks com] Sent: Friday, June 06, 2003 15:48 Cc: security-basics () securityfocus com Subject: Re: Securing a Win2k DNS server outside firewall... If it's a Win2K box.... In the Network properties of the NIC, double click TCP/IP, then click advanced. Under the WINS tab, select the Disable NetBIOS over TCP/IP. That should do the trick. "VNV Jeep" <vnvjeep () hotmail com> 06/06/2003 12:05 PM To security-basics () securityfocus com cc Subject Securing a Win2k DNS server outside firewall... Hi All... I have 2 Windows 2000 DNS servers sitting on the outside of our firewall. They're vanilla installs of Win2k server, both running as member servers, locked down as much as possible, running a primary & secondary DNS configuration. When running a port scan against these servers, one of the only things that tends to worry me is that they both answer to port 135 RPC. I've tried to figure out a way to prevent that port from being available, but all I could find as far as answers go is that I'd need to run a firewall to block it. I did try running a small firewall on the servers, but ran into issues since DNS tends to use a myriad of dynamic ports when answering queries... Does anyone have any good ideas on how to lock down a Win2k server like this so that the only thing available as far as services go is DNS, and the replication thereof? Thanks in advance for your advice... Take care, Mike _________________________________________________________________ MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*. http://join.msn.com/?page=features/virus --------------------------------------------------------------------------- ---------------------------------------------------------------------------- --------------------------------------------------------------------------- ---------------------------------------------------------------------------- --------------------------------------------------------------------------- Evaluating SSL VPNs' Consider NEOTERIS, chosen as leader by top analysts! The Gartner Group just put Neoteris in the top of its Magic Quadrant, while InStat has confirmed Neoteris as the leader in marketshare. Find out why, and see how you can get plug-n-play secure remote access in about an hour, with no client, server changes, or ongoing maintenance. Visit us at: http://www.neoteris.com/promos/sf-6-9.htm ----------------------------------------------------------------------------
Current thread:
- Securing a Win2k DNS server outside firewall... VNV Jeep (Jun 06)
- RE: Securing a Win2k DNS server outside firewall... David Gillett (Jun 06)
- RE: Securing a Win2k DNS server outside firewall... Richard Parry (Jun 06)
- Re: Securing a Win2k DNS server outside firewall... beartman (Jun 06)
- RE: Securing a Win2k DNS server outside firewall... dave (Jun 06)
- <Possible follow-ups>
- RE: Securing a Win2k DNS server outside firewall... Bermingham, Bob (Jun 06)
- RE: Securing a Win2k DNS server outside firewall... VNV Jeep (Jun 06)
- RE: Securing a Win2k DNS server outside firewall... Manuel Fernandes (Jun 09)
- RE: Securing a Win2k DNS server outside firewall... Minneker, Andrew L. (Jun 06)
- RE: Securing a Win2k DNS server outside firewall... Pascal Rossillon (Jun 06)
- RE: Securing a Win2k DNS server outside firewall... VNV Jeep (Jun 06)
- RE: Securing a Win2k DNS server outside firewall... type_o (Jun 09)