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jdanaFlag for United States of America asked on

Windows Server 2003, DHCP - Out of IP addresses

One of the folks in the office saw this message today:

“IP address conflict. Another computer on this network has the same IP address as this computer.”  

I checked DHCP, and sure enough, every single IP was issued today.  I have a /24 network, and I'm out of IPs.  Over the last 2 years I've reduced the DHCP lease duration from 5 days to 4, to 3, to 2, and now I'm down to 1.  

The obvious fix seems to be to change the subnet mask on the network.  (I'm thinking of going with /16).  The effort required to do so, however, would be considerable.  

Anyone have any clever workarounds?  Or, do I need to bite the bullet and change the subnet mask?
DHCPWindows Server 2003Routers

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jdana

8/22/2022 - Mon
SOLUTION
Duff614

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172pilotSteve

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ASKER
jdana

Steve and  Duff614,

Wow.  Terrific responses.  

I have a Cisco ASA 5505 firewall associated with the network, and, candidly, it's the one device in the network that makes me nervous to configure.  I'm a really developer who has a part time gig as a network administrator with my big client.

I'm not sure if this is an appropriate question to pose on EE, but what the hell, it can't hurt to ask.  Do either of you work with Cisco firewalls?  If not, do you know of a good contractor that does?  (I could remote them in.)  This is one project I'd like to tackle with some assistance.
172pilotSteve

Ahh!  Cool..  YEs - I have a 5505 here at home too..  (Gotta have a good lab, right?!)  so I think I can walk you through what you might need..


Can  you copy your ASA config into here?  Be careful to block out any passwords, and even any EXTERNAL ip addresses, just to be safe..  Like, if your external ip was 20.30.40.50, maybe you could do a global search/replace to change that to 1.1.1.1 or something.

Do you use the GUI to program the ASA, or do you use the command line?  Personally I'm more of a command-line guy, but if you use the GUI, I can try to simulate what you're doing, and come up with some steps in the GUI..
ASKER
jdana

Steve,

I figured out the lease issue.  (There was a little stupidity on my part.)  Thanks for the terrific suggestions.  I saved them to my master cheat sheet.

I appreciate the offer as well.  

You have an ASA 5505 at home.  That's pretty funny.

J
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