Solved

How does or does multi-homing protect a server from threats?

Posted on 2007-03-21
6
255 Views
Last Modified: 2010-04-19
I’ve never physically been to this client’s site yet but I was just handed a project to check out this network/server and make sure it's sufficiently secured from the Internet. It’s an SBS 2003 SP1 box. It appears to be multi-homed, where NIC 1 is touching the Internet with a public IP and NIC 2 is serving the LAN with a 192.168 network.

My question for now is how does multi-homing protect a server? I would think we’d want a firewall between the Internet and the server…. call me kooky. Thanks!
0
Comment
Question by:WineGeek
  • 3
  • 2
6 Comments
 
LVL 22

Expert Comment

by:Olaf De Ceuster
ID: 18768256
SBS Standard uses NAT and basic firewall functions to limit access to the outside world.
This is set up in the Internet Connection Wizard in Server Management. TO DO LIst> Point 2.
http://www.sbs-rocks.com/sbs2k3/sbs2k3-n2.htm
Make sure to untick the Business website (www.root) to stop access on port 80.
If you are running SBS Premium you have a full blown software firewall with ISA2004.
Certainely doesn't hurt to have a good hardware firewall over and above.
Hope this helps,
Olaf
0
 

Author Comment

by:WineGeek
ID: 18768279
That excellent stuff olafdc. Maybe I need to re-word my question though: I just want to know how setting up 2 NIC's (multi homing) with different networks assigned to each in a SBS box helps secure the server from Internet threats? Let me know if I'm not making sense please.... :)
0
 
LVL 22

Accepted Solution

by:
Olaf De Ceuster earned 500 total points
ID: 18768364
Sorry,

It allows you to use the internal firewall functions.
Using one NIC only will exclude some of those functions because it is assumed you have an external firewall.
Isa will only work properly with two NIC's
Olaf
0
Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 

Author Comment

by:WineGeek
ID: 18768524
So when you say "internal firewall functions" you're referring to ISA? ISA isn't installed on this SBS box as far as I know, which is all part of what I"m trying to clarify for myself. Your input is helping - thanks.
0
 
LVL 11

Expert Comment

by:Stephen Croft
ID: 18768542
Not ISA, but more like an extended windows firewall.

If you wanted to secure it this way, maybe ISA would be worth doing. personally though id put a router between the internet card and the internet. for the cost and the extra reasurrance its worth it.
0
 
LVL 22

Assisted Solution

by:Olaf De Ceuster
Olaf De Ceuster earned 500 total points
ID: 18768612
A i said before: Even SBS standard comes with NAT and basic firewall functions.
If you run the internet connections wizard on a system with one NIC some of these functions are disabled, if you have two NIC's you'll be able to configure all basic firewall functions on the system.
ans if you want a real firewall you need ISA (I'll get shot for this: or the easier alternative: install a hardware firewall)
Please note that the basic firewall functions in SBS2003 are quite OK.
Hope that helps,
Olaf
0

Featured Post

Active Directory Webinar

We all know we need to protect and secure our privileges, but where to start? Join Experts Exchange and ManageEngine on Tuesday, April 11, 2017 10:00 AM PDT to learn how to track and secure privileged users in Active Directory.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The problem of the system drive in SBS 2003 getting full continues to be an issue, even though SBS 2008 and SBS 2011 are both in the market place.  There are several solutions to this, including adding additional drive space or using third party uti…
The articles for turning off the Client firewall policy on the internet are for SBS 2008 and don't really help for SBS 2011. They actually moved the Client firewall policy. In 2011, the client firewall policy has moved to the SBS computers conta…
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…

831 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question