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DHCP

By tgreene ·
I am running Netware 5 in a public high school with about 100
workstations attached by way of TCP/IP and IPX. I recently began the
process of converting to DHCP from a system of static IP's. My network
is segmented into three subnets (subnet 1,subnet 2, subnet 3,), each
subnet has been defined and IP's assigned. The file/DHCP server's IP is
within subnet 3. The big problem I've run into is that the only pc's
that will release their static IP and pick up a dynamic assignment are
those pc's on the SAME subnet as the file /DHCP server. The pc's in the
other two subnets will give an error message stating the they cannot
obtain a valid IP from the server. All subnets have been set up to
recognize the DHCP server by name in the DHCP Console Mgr. I am running
only one NIC for all three subnets. What am I missing here...what
should I be doing to get all pc's to obtain IP assignments?

Terry Greene
Technology Coordinator
Burr Oak Community Schools
Burr Oak, MI

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DHCP

by gregc In reply to DHCP

The problem is DHCP uses broadcast and be defualt routers do not forward broadcast traffic. What Router are you using to seperate the networks?? On those routers you need to enable UDP forwarding for ports 68 (Bootp Client) and Port 67 (Bootp Server). If the routers used are Cisco "IP HELPER" is what you are looking for, on other platforms it is different names but usually DHCP Relay or something similar. Good Luck.

Greg

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by tgreene In reply to DHCP

The question was auto-closed by TechRepublic

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DHCP

by hieuc In reply to DHCP

Have you tried creating a subnet pool?

Hugh

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by tgreene In reply to DHCP

The question was auto-closed by TechRepublic

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DHCP

by konopko_przemyslaw In reply to DHCP

DHCP sends BROADCAST, soo those 2 remote subnets can't see a DHCP, because there are routers between subnets. And routers won't pass broadcast across to another subnet.
To correct this, you need to have a
BOOTP ROUTERS(RFC1541), they will let pass
BROADCAST to THE remote subnet.So then yours workstations will see a DHCP.

OR

Install 1 DHCP RELAY AGENT on each remote subnet. (very easy to setup, you can installed on any NT BOX)
You recive this with WINNT SERVER CD .In WinNT go to Control Panel,then Network right clic, properties,service tabb, add new service,DHCP RELAY AGENT. You need to have Cd in your Cdroom.

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by tgreene In reply to DHCP

The question was auto-closed by TechRepublic

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by gkapeth In reply to DHCP

Hey Terry

How are the different subnets connected to the server? Via hubs, routers or brouters? It depends on the way your network is set up. Some routers don't forward DHCP broadcasts, if you could supply more info about the set up, I might havea solution.

Greg

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by tgreene In reply to DHCP

The question was auto-closed by TechRepublic

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by tgreene In reply to DHCP

This question was auto closed due to inactivity

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