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Old 01-01-2006, 03:00 PM   #1
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DMZ and designed network segment

Hello, Happy New 2006 Year!

First, what exactly means DMZ? I already know, it's demilitarized zone, but may anyone tell me, when we use that? What exactly is it's task? What does it do?

What should I understand under "designed network segment"? I have done some google searches, but haven't found anything concrete.

thanks in advance.
Old 01-01-2006, 03:57 PM   #2
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Together they should give the picture. In short, you use DMZ if you want to separate your servers from your internal network.

'Designed network segment'... What's the context? Without it, I'd think it's just about a network segment that had a project of some kind.
Old 01-01-2006, 04:10 PM   #3
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Here is a very broad explantion. The normally is to have a router with 3 nics in it. First nic connects to the internet. second can connacet to internal lan machines and the third will be machine on the dmz circuit. Normally these are server machines that will be seen from the outside internet as machines on the first nic. The dmz is less secure because you allow open ports from the internet to it. On the lan side you very seldom have any open ports (normally never open any ports) to make information as secure as possible on this side.

designed network segments if I understand is usually used in large businesses. They create subnets of class A,B,or C address and divide them into smaller subnets. Look up subnetting for more info. So in a class C address of and using the subnet to define it as a class C you have use of 255 IP from to

Now if divide a class C into smaller segemnts we use with a subnet or same as You will have total of 30 ip's to work with from to and use of as broadcast. For the next segment you would use which gets you to with as broadcast. Even though both may be on the same network it requires a routing table to allow packets to and from each segment. One seldom divides a class C unless segmenting users from seeing each other.

Items to help in search. iptables, subnetting, firewall, routing, gateway.

lan    dmz

Hope this helps out.


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