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DHCP question!

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by mak15

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Hi,

I'm working in a NT Server environment, which most of the clients are using DHCP. Recently, I changed some Macintosh clients to static IP addresses. Then, I was very busy, coz some of the IP addresses that I entered was using by some othercilent that using DHCP.
My question is in the NT Server, DHCP Manger, scope properties I have Started:162.79.61.194 End: 162.79.61.220.
Can I increases the End to 162.79.61.255?

But the server is 162.79.61.222, will their be any conflict?

Those DHCP Clients, each time they logon to Network, will the server provides different IP address to them, other than the one that they used for last logon?

Thanks for your help!!!

Best regards,

-Mak

9 replies

by rob baugh

Mark,

Rather than setting your MAC clients to a static IP, put them back on DHCP, but reserve the IP in DHCP to the MAC's MAC (NIC) address. This will allow them to use the same MAC address every time, but gives you flexibilty if you need to change the IP for the Gateway or DNS/Wins servers.

I don't know how you would look for it on a MAC, but using NT you can find out what the NIC address is by pinging the target computer, then run ARP /A look for the IP and that will give you the address for the NIC. Then take that address and add it to the reserved list on your DHCP server.

Rob

by antony_k

The best way is to create an exclusion range(for example from 162.79.61.220 to 162.79.61.230) and give addresses from this range to computers(or other equipment like printers, routers, etc.) which must have static IPs.

by culverc

Increase the scope range? Yes, but you might have to create a new scope entirely.
Server conflict? no. since your server should be setup with a static IP, it will never receive parameters or request IP info from the DHCP service. So, it's IP is irrelevant.
DHCP server provide different IP's at logon? No. The renewal period specified in your DHCP options will allow IP leases for the duration you specified, when they renew, they request the same IP, if not available, receive one not assigned, but within your IP range.
In general, setup how you want DHCP to operate within your network. Setup a static IP for your server. Setup clients to use DHCP. Use the IPCONFIG /RELEASE command on your workstations to release your clients' current IP, then use the IPCONFIG /RENEW command to request a new IP from your DHCP server. The DHCP service will now allocate an IP to them that is within its scope and any other parameters specified by DHCP.

by tbradley

There's a very simple solution to your problem.

You say your range starts at 194... you can set the end of the range to be 254 ( 255 can't be used ).

Can you change your server tcp/ip address, or would that involve a lot of work at the client side. If it doesn't, then simply place your server at 194 or 254, and use the entire range in-between for your dhcp assignments.

Any special reasons for putting the macs on static ip's? If not, release them, and let them grab new IP's from the server.

One nifty note about DHCP, as long as there is not a backup in the same net which assigns numbers in your range is that you can set a static within your range. If the server is down, or re-boots, no new numbers are assigned to workstations until the server binds to it's own number ( 222 ).

If there are other DHCP servers in the mix, they should all be aware of the 222 reservation, and not assign this number if the server is down.

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