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DHCP server

Posted on 2000-03-14
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Last Modified: 2013-12-28
I have WINNT 4.0 installed with DHCP server on it.
I´ve put the IP range : 192.169.1.1 to 192.169.2.254  (class B) on the scope.

But it only assigns IPs from 192.169.1.1 to 192.169.1.254. It does not assign IPs from 192.169.2.1 to 192.169.2.254.

I´m using the mask 255.255.0.0;
Why does it happen ? Is it because 192.... is a Class C address ? I think it should not cause problems, because it´s an internal network.

Hope you help me !
Thanks!
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Question by:ptenuta
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12 Comments
 
LVL 8

Expert Comment

by:MaDdUCK
ID: 2616004
since the *.2.* is a different subnet, you have to put it on a different scope. do you have any routers?
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Author Comment

by:ptenuta
ID: 2616051
But even if I use a Class B netmask ?
Yes, I have a router.
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LVL 8

Expert Comment

by:MaDdUCK
ID: 2616094
mh.
i am just thinking that it is a C class address, and it's not that the internet tells you this, it's a bit thing within the address. try the multiple scope approach.
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LVL 1

Expert Comment

by:awetherhold
ID: 2616457
You need to create a supperscope for you DHCP server.  Here is the article. Q161571

http://support.microsoft.com/support/kb/articles/Q161/5/71.asp?LNG=ENG&SA=ALLKB&FR=0

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LVL 1

Expert Comment

by:awetherhold
ID: 2616487
I’m too busy thinking of lunch; that should read ‘super scope’ (not supper).  It allows you to combine two logical subnets on one physical subnet.
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LVL 23

Expert Comment

by:Tim Holman
ID: 2616490
Supperscope.
Hmmm.. anyone hungry ?

:)
0
 
LVL 23

Expert Comment

by:Tim Holman
ID: 2616522
If you want to serve a 500 PC network, why not create a 500+ PC subnet mask ?
ie - have a subnet mask of 255.255.240.0 or something, giving you 14 subnets of 1024 machines ?
0
 

Expert Comment

by:StoneB
ID: 2620460
ptenuta,

I have a fairly simple way to resolve your problem.

Use 10.x.x.x and subnet it down to the class b that you need. This gives you flexability if want to plan for growth.

Example: set the DHCP IP range to 10.1.1.1 to 10.1.3.254 use a subnet of 255.255.0.0 this way you have plenty of room for your currnet nodes and plenty of room to grow. If you ever expand to beyond this range all you have to is extend your scope and not worry about re-subnetting your network.

 
0
 
LVL 2

Expert Comment

by:cgoca
ID: 2624538
stoneb's solution is the best.
problem is your ip address.
you can't use 192.* as B class.
0
 

Expert Comment

by:StoneB
ID: 2624759
The 192.169.x.x is an internal network. These numbers are not used on the Internet.

There is no reason why ptenuta can't change the network to a 10.x or any number for that matter.

The only reason the initial scope did not assign addresses to the 192.169.2.x
is because 192 is a class c IP address. Therefore limiting you to 254 addresses. Anything past the 254th address will not be assigned.

Ptenuta is not restricted by the actual number he/she picks only which class the number that he/she picks. That is why I suggested a Class A number, a Class B would work fine as well. I just always find it easiest to use 10.x.x.x
0
 
LVL 3

Expert Comment

by:apadua
ID: 2641171
Folks, for starters, the class of an address is defined by the beggining bits of the address. Therefore, no matter what the mask, 192.169.x.x is always going to be a class C address. However, it is possible to create one big network by joining multiple class C addresses. It's called SuperNetting (from the opposite of SubNetting).

The net Mask you need to use for what you're trying to do is 255.255.254.0 , which will give you a network with 510 useable addresses.

On a side note, the address 192.169 is not reserved for Private use. Only 192.168 is. If anyone's interested, I'll send the RFC number (gotta find it).


Cheers,

Andre
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LVL 23

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Tim Holman earned 300 total points
ID: 2788269
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