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DHCP Issue Server not on address pool

Posted on 2012-03-21
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Last Modified: 2012-04-05
Fo reasons only known to BT I have had to give a domain controller server 2003. A public IP address and route to it using a BT "Business" Hub. As they dont support NAT. After that my DHCP has stopped working? range being 191.168.100.10 to .254. The server is now out of this range. Do i need a superscope. All other non BT ADSL networks i work on have the server within the scope
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Question by:techies123
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7 Comments
 
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Expert Comment

by:arnold
ID: 37748896
Yes. or you need to have two nics one on the public side and one on the private side.
Not sure what the issue is that lead them to tell you to make such adjustments.

The issue with superscopes, you would need to have a relay agent that would mark the segment on which the IP is to be allocated.
You could add two IPs on the same network interface.

It is rather peculiar that you now have your DC exposed to the net.
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Author Comment

by:techies123
ID: 37748931
It was because the client had a range of 5 ip's i had to set up the public IP against the MAC address of the server. The only way it could be done apparently!

too advoid cabling

how do i do

You could add two IPs on the same network interface

?
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arnold earned 1500 total points
ID: 37748952
the other option is configure the SCOPE of the DHCP server to match the public IPs the client gets and allocate that.

Make sure to enable windows firewall. But the ports needed for the data sharing will also be available on the Net accessed public IPs.

Is this server supposed to connect the LAN to the Net?


Does the client have a router that they can use between the external feed and the LAN which will handle the NAT.

It sounds as though the connection being dropped is a bridge and requires a router either in the form of a computer with two nics, which it sounds the system you used does not have.
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Author Comment

by:techies123
ID: 37748970
Just need DHCP to work on Single NIC with the server with a public IP and clients internal IP?
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Expert Comment

by:arnold
ID: 37749019
how are you connecting the clients to the server if all the server has is a public IP?

Within the configuration of the network interface on the server, add a second IP that is on the same segment as the LAN
This way you will have an IP in each.

localarea connection
pulbicIP Public_netmask Public_ip_default_gateway
192.168.100.1 255.255.255.0

In the DHCP scope, presumably you will be pushing the default gateway as the IP on the DHCP server.
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Author Comment

by:techies123
ID: 37749248
Have added the 192.168.100.1 to the network card of the server. Will have to test tomorrow if it will work.
I am pushing the DG as the router address which is the router IP
Thanks
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Expert Comment

by:arnold
ID: 37749303
The internal IPs have no path to the router IP as the default gateway.

All they know is 192.168.100.x
Since the router does not do NAT, it has no idea where 192.168.100.x is or how to get to it.

It would be similar to me telling you go to 100 main street
Without the town information, the above reference is meaningless.
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