Solved

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

Posted on 2007-03-21
6
263 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
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 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
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

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

Business Impact of IT Communications

What are the business impacts of how well businesses communicate during an IT incident? Targeting, speed, and transparency all matter. Find out more in this infographic.

Question has a verified solution.

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

This guide is intended for migrating Windows 2003 Standard with Exchange 2003 to Windows Small Business Server 2008. You will need the following: Exchange Best Practice Analyzer: http://www.microsoft.com/downloads/details.aspx?FamilyID=DBAB201F-…
A quick step-by-step overview of installing and configuring Carbonite Server Backup.
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

739 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