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About DHCP in windows nt

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by ask_anurag

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Hi,
I have a windows nt server 4.0.Ip address is 192.168.100.6 subnet mask 255.255.255.0.I installed DNS server and ip is 192.168.100.6. I installed DHCP in my windows nt.I created two scopes one is 192.168.100.10 to 192.168.100.50 and second one is 132.147.100.20 to 132.147.100.55.Now when my clients access connect DHCP they always get 192.168.100.10 series IP address they are not getting 132.147.100.20 series IP address.I want that some user get 192 series ip and some will get 132 series ip.How i do it.Second i entered this command on my clients system.ipconfig/release to release the ip address but they always gets old ip like 192.168.100.12 or 13 or 15 like this.
I want when my clients give request to DHCP server they always get different IP address.
How i do it.
Anurag.

5 replies

by rokitrider

DHCP assigns it's address pool according to the ip acl that the router or switch is assigned. Example. You have 3 sites. Your requirement is that each site has it's own class c address assignment. The router that connects each site has an outside interface that you statically assign an address from your required class c scope. DHCP assigns it's address pools according to the packets origination. (the router interface). In a nutshell, the router interface dictates which subnet is assigned.

by timwalsh

Does the DHCP server physically belong to 2 different subnets (192.168.100.x and 132.147.100.x)? If not, that is part of your problem. DHCP servers usaully only provide address to the subnet to which the server is connected.

DHCP servers can service multiple subnets if either the router that separates the subnets can be configured to pass DHCP broadcasts or if a DHCP Relay Agent is configured on the subnets that don't include the DHCP server.

DHCP will only give a computer a different IP address whne renewal occurs if the previous address is taken by another computer. DHCP provides IP addresses on a first-com, first-serve basis, issuing numbers from lower to higher. In a release/renew cycle, the only way a computer will get a different IP address is if a lower IP address is available. The only way for your clients to ALWAYS get different IP addresses, would be if you could release all IP addresses at the same time and then renew addresses in a different order each time renewal occurs. WinNT DHCP server does not provide this capability natively.

Hope this helps.

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