DHCP Refresh

[Grommit]

Hi

 

How do I refresh the entire site of IP addresses...

 

My lease's were for 100 days asI was looking into a longer term IP Lease.. but it seems to have sucked up all the addresses ..

[Heebeejeebee]

You may want to try reserved IP addreses instead of a long lease if you want to make them almost static.

 

HBJB

[EduYank]

I've been in this situation before and it's no fun. Change the lease time to an hour until your addresses are freed up, then decide on an appropriate number of days. By default, I don't believe that PCs check in with the DHCP server until their lease reaches 87.5% usage so it might not be instantaneous. I have many machines and I've never had any problems with the default setting of 8 days. I personally wouldn't assign them reservations unless you have a need for static addresses because it would be a ton of work for very little payoff.

 

If it's a true emergency, you could remotely release and renew their IP addresses to get them on the new hour lease. Use a utility like Remote Command GUI to do it from your desk.

 

Also, you could change the DHCP scope to a superscope to give you more addresses (assuming you can expand into the next subnet). At my school, we only use superscopes to avoid this problem (and we learned the hard way).

 

Brian

[Heebeejeebee]

I personally wouldn't assign them reservations unless you have a need for static addresses because it would be a ton of work for very little payoff.

 

Two mins work with netsh

 

It seems to me that 100 days is nearly static so why no go to the next step.

 

Because we are tied to which range we can use by the SWGfL I had to recently ask to be moved onto a different subnet which doubled our allocation. Because we were converging our admin and curriculum networks using new servers on the joined network we were effectivly running 3 distinct sets of IP addresses all on different subnets.

 

Bloody RM. Wht can't we use the range we choose and not one that they say we must use?

 

HBJB

[Ric_]

Why don't you guys NAT your networks? It seems the logical step if you are tight on IPs.... surely not all your machines need outward facing addresses anyway.

[Geoff]

Yep, you can create a DMZ too if you need outward facing machines.