In computer security, a DMZ, or demilitarized zone is a physical or logical subnetwork that contains and exposes an organization's external services to a larger untrusted network, usually the Internet. The term is normally referred to as a DMZ by information technology professionals. It is sometimes ...

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14
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2answers
615 views

How big of a problem is it to punch a hole in the DMZ to one web server?

We currently have our web server in a DMZ. The web server cannot see anything within the internal network, but the internal network can see the web server. How safe would it be to punch a hole in the ...
7
votes
4answers
263 views

Security for university research lab systems

Being responsible for security in a university computer science department is no fun at all. And I explain: It is often the case that I get a request for installation of new hw systems or software ...
6
votes
2answers
1k views

Distinction between an extranet and a DMZ

I've been reading about intranets, extranets, DMZs and VPNs now, and I'd need some clarifications related to extranets and DMZs. I understand that they are different types of concepts - extranet ...
6
votes
4answers
7k views

Should a webserver in the DMZ be allowed to access MSSQL in the LAN?

This should be a very basic question and I tried to research it and couldn't find a solid answer. Say you have a web server in the DMZ and a MSSQL server in the LAN. IMO, and what I've always ...
6
votes
2answers
2k views

DMZ subnet: to NAT or not to NAT?

I'm looking at setting up a DMZ behind a Cisco ASA that will contain a large number of HTTP front-end load balancers and SSL offload services - over 100 IPs, concentrated on a smaller number of hosts. ...
6
votes
2answers
2k views

Virtual host on LAN - VMs on DMZ, separate NICs - is this a bad idea?

Just kicking this idea around, and wanted to see if you'll be so kind as to point out the problems I don't see. If I set up this new HyperV host as a normal domain member, the benefits are obvious. ...
6
votes
2answers
3k views

Is there a secure way to allow IIS 7 in a DMZ to access a DB server behind the firewall?

Our network admins are adamant that it is insecure for our web servers, which are hosted in the DMZ, to access the DB server behind our firewall. To get round the problem, we access the data via web ...
5
votes
3answers
5k views

Active Directory in a DMZ

What is the best way to manage user accounts for Windows servers in a DMZ? We are expanding our web presence and adding several IIS servers to our DMZ. I would prefer not to manage a bunch of local ...
4
votes
6answers
3k views

Does Wireshark pose a threat when installed on a server in the DMZ?

If you install wireshark on a web server sitting in the DMZ, is there a hack that can be used to get backdoor entrace to that server even when RDP is disblaed? I'm trying to monitor the wire on the ...
4
votes
3answers
3k views

Placing a server in the DMZ vs opening firewall ports

When should you place a server in a DMZ vs opening ports on the firewall and keeping it within the network? I'm referring to active directory servers, IIS servers, and mostly things on a windows based ...
4
votes
1answer
4k views

DMZ Setup with two firewalls - Traffic from DMZ to LAN and LAN to DMZ

I am setting up a network with machines that need to be accessible from the internet. I'm planning on putting these in a DMZ. Some of the machines in the DMZ need access to machines on the private ...
4
votes
1answer
394 views

Backing up a server on the DMZ

We have a somewhat-static web app with a large amount of media files that runs on a 2008 R2, non-domain server on the DMZ. I need to backup the media files on the server. The current backup mechanism ...
4
votes
2answers
2k views

public ip resolves externally but not internally

I have a one to one NAT on pfsense that assigns a public IP to an internal IP (running a web server). When I open the public IP from an internal machine, it will not resolve to the internal IP, ...
4
votes
2answers
2k views

Exposing IMAP server to Internet: DMZ or Port Forwarding?

We currently have all our email stored on a Dovecot IMAP server in our internal network. Client machines on the network are able to connect and access their email. Now we want to allow certain users ...
3
votes
1answer
749 views

Will you allow NetBIOS into your DMZ?

Is it secure for a firewall to allow NetBIOS connections from the internal network to the DMZ? If not secure, what are the risks? If secure, what is the FUD about and what are the counterarguments? ...
3
votes
3answers
4k views

Active Directory Domain Controllers in a DMZ

I am looking to deploy 2 additional Windows Server 2003 domain controllers into a separate confidential DMZ alongside 6 DCs that are installed in the regular network, making a total of 8 DCs. The 2 ...
3
votes
1answer
864 views

Should I dual home our webservers (DMZ/Internal network) or just do 1-to-1 NAT?

I'm setting up a rack of servers which will have 2 webservers and 10 internal servers that provide back end application support (migrating from an AWS environment). We'll have virtual machine ...
3
votes
3answers
909 views

How to collect logs with syslog-ng from www servers in dmz and send them to server behind firewall(NAT). Can Zabbix proxy solve this?

I have several www servers in DMZ. My monitoring and log gathering server lays in my LAN. There is no comunication like WWW server in DMZ ----> monitor server in LAN. I can connect DMZ from my ...
3
votes
1answer
869 views

How to place a virtual machine in DMZ?

I have an Ubuntu 12.04 server running few virtual machines with KVM. I would like to expose some of these virtual machines on the internet, to make it possible for customers to test the products ...
3
votes
1answer
86 views

How can I tell if a host is bridged and acting as a router

I would like to scan my DMZ for hosts that are bridged between subnets and have routing enabled. Since I have everything from VMWare servers, to load balancers on the DMZ I'm unsure if every host is ...
3
votes
1answer
4k views

What is a DMZ in the simplest of examples?

I am new to the world of networking and am having a hard time understanding what a DMZ is. I understand a DMZ is where you place publicly accessible servers such as Web servers, Mail servers, etc. ...
2
votes
7answers
3k views

Should databases containing customer information go in a DMZ?

We're deploying a simple newsletter webapp on a stand-alone LAMP platform in the company DMZ. There is some discussion as to whether the MySQL server should be removed from the DMZ and put in the ...
2
votes
4answers
5k views

If you need to open ports from DMZ to LAN, at what point is the separation no longer worth it?

If you have a DMZ with one or more servers/services (maybe FTP, HTTP en SMTP). And you have a LAN with typical serversservices (like file sharing, Active Directory, database server). Depending on ...
2
votes
5answers
1k views

SFTP: How to keep data out of the DMZ

We are investigating solutions to the following problem: We have external (Internet) users who need access to sensitive information. We could offer it to them via SFTP which would offer a secure ...
2
votes
4answers
2k views

To DMZ or not-DMZ on new web site

We are about to release a web application for our users, and are trying to figure out if others put their servers in a DMZ, or just keep it off the domain behind the firewall and greatly restrict ...
2
votes
3answers
232 views

network topology including many services

I know this is yet another question on how to setup network but I hope you are not bored of such questions yet. The site is also an office, so it includes windows dc, windows ad, exchange, sql, file ...
2
votes
2answers
406 views

Internal traffic card and external traffic cards on the same server… how to configure?

This might sound like a noob question, but here is what I have to configure: FreeBSD 1 server with 2 network cards 1 network card for internal IP addresses (5 of them) 1 network card for external IP ...
2
votes
3answers
275 views

Webservers - Attached to AD or not?

Do you prefer to run their IIS webservers inside a DMZ that is part of the greater organisation's AD or do you prefer to sacrifice ease of management and user control over (possibly perceived) ...
2
votes
1answer
53 views

Web server with access to internet and internet Active Directory [closed]

This might sound like a stupid and unsecure question, but we're front-end web delopers and don't know that much about these things. So here goes.. We're creating a web app where we want to log in ...
2
votes
1answer
477 views

What's the best method of achieving device isolation in a DMZ?

I have an ADSL connection which has a /29 subnet allocated to it, giving me 6 usable IP addresses. Currently this has a cheap Netgear ADSL router attached, which has a built in switch. There are 3 ...
2
votes
1answer
702 views

Is it necessary to have DMZ machine or zone on a network?

Is it necessary to have DMZ machine or zone on a network? What reasons are there for having a DMZ machine or zone? If the DMZ zone cannot communicate with the normal network at a site, why have it?
2
votes
3answers
217 views

ASA: How to connect server with a external IP address already assigned?

Any ideas how this can be done on a ASA? There was a sonicwall in place but it just died and we do not have a replacement besides this ASA. The 24.172.x.132 is a spam filter and I can't change the ...
2
votes
3answers
3k views

Cisco ASA 5505 DMZ Setup Issue

I have an ASA 5505 running v8.4. I have one static IP that my ISP gives me and I need to use that for my INSIDE network as well as my DMZ. This becomes a PAT issue as I need some ports to terminate ...
2
votes
2answers
192 views

Just LB or also Web Servers in Demilitarized Zone?

In a load balanced environment, is it necessary to have all of the web servers in the DMZ? Or will just having the Load Balancer in the DMZ achieve the desired security? If it matters, the web ...
2
votes
0answers
1k views

Allowing LDAP authentication from DMZ to Active Directory. Is my idea secure?

I have a internet-facing application server that I want to use AD authentication. This is my first time doing this for a none MS application or without some sort of proxy. I already have a idea in my ...
2
votes
0answers
224 views

Deploying a ASP.Net WebAPI website and DMZ

I have a set of RESTful services developed using ASP.Net WebAPI which is a single project. I handle authentication via ASP.Net's built in Forms Authentication (cookie based) mechanism which is also ...
2
votes
1answer
1k views

How to Deploy an ASP.NET Web API- and Browser-based Application to a Production Environment [closed]

(Please forgive if this is posted in an incorrect forum. We didn’t know exactly where to post it.) We have an ASP.NET Web API single page application - a browser-based app running in IIS to serve up ...
2
votes
1answer
612 views

Best practices for LDAP and DMZ

We are in the process of setting up a DMZ and I have stumbled into the question of how to handle machines that need to have ports exposed to the internet, but at the same time be able to make LDAP ...
2
votes
1answer
433 views

Howto maximize utilization of assigned subnet block for DMZ

I'm part time sysadmin for a small hosting company with currently 20 different public servers. We have a 27 subnet block that gives us a maximum of 30 usable IP addresses. That much I know, but how do ...
1
vote
3answers
445 views

Find all internet facing servers

We have a large network with many servers. What is the easiest way to find all the servers that are Internet facing? Manually checking each server is not an option.
1
vote
1answer
2k views

VLAN security compared to DMZ

I found this question very illuminating about DMZs and when to place a server in one. We're re-organizing our internal company network (keeping the same external IPs and domains), our mainly Windows ...
1
vote
4answers
502 views

Putting a Windows DC, Exchange in a DMZ

I have one guy at my company telling me that I should put FF:TMG in between my main Internet-facing firewall (Cisco 5510) and put my Exchange server and DC on the internal network. I have another guy ...
1
vote
2answers
988 views

Should I Run TMG as a Hyper-V Guest

Okay here's an interesting question. In two parts: Is it advisable to run TMG as a hyper-v guest in production? (something is nagging me that it's not a good idea, but it's possible to give a VM ...
1
vote
3answers
1k views

Cisco Multi-DMZ firewall

I need to find a firewall that will give me 1 LAN port, and 5-7 DMZ ports. I have a requirement to replace some FreeBSD systems that are used to run some testing equipment. It is essential that the ...
1
vote
3answers
324 views

Accessing Internet from the DMZ

I am trying to configure a DMZ using IPCop but it looks like the default configuration for a DMZ in IPCop is no DHCP and no access to Internet. Even when I manually configure IPCop as my default ...
1
vote
1answer
235 views

When moving a server from behind a firewall into a DMZ, should you move a test server first? [closed]

We have to move a server from within the firewall to a DMZ (not a true DMZ, but a space that's between 2 firewalls. Is it typically a good idea, when moving a server in this fashion, to stand up ...
1
vote
4answers
754 views

Looking for low cost VPN/DMZ solution [closed]

I am looking to set up a VPN and DMZ solution for a small business. Here is some background and some of their requirements: The is a small business with maybe a dozen servers and another half-dozen ...
1
vote
2answers
664 views

What would a simple DMZ look like for scenario of database server and (web server+middle tier)?

I have two Linux servers: The first contains an Oracle 11G database that includes an Oracle HTTP Server The second contains a Java middle tier plus Apache webserver and Apache Tomcat. Someone ...
1
vote
3answers
173 views

Securing VPN access from users machines (home office)

We already have a couple of people working from home, accessing some internal servers via VPN. They're all using company provided laptops or PCs which we have complete control over. Now we're faced ...
1
vote
5answers
1k views

DMZ configuration and firewall throughput

I've been asked to look into placing a firewall between a webserver (Debian/Apache/PHP) in the DMZ and a backend MySQL database to achieve "isolation". Right now, iptables is running on the MySQL ...