DHCP - IP running out

shaha · 09-14-2007, 11:28 AM

Hello all.

My DHCP server says that its running out of addresses but I have only 100
leases. My scope is of about 225 addresses but under scope leases I only see
about 100 computers/leases. Where are the rest? I had to change the lease
duration to 1 day but that didnt help too much. If I go through the list of
leases and find ones that are not in there and ping them, I get no replies.
That means that they are availble but DHCP is not giving them out....?????
Some users do also connect via RDP so some leases show up as RAS.

Any clues???????? Thanks guys.

ps...I do have an some exclusion of about 30 addresses. But there should be
another 100 or close to it. They all cant be being used. I have to go and
delete some addresses to give to users....

Thanks.

**Cellus** · 09-14-2007, 12:05 PM

What is the DHCP scope set at right now? What are the other DHCP settings?

shaha · 09-14-2007, 12:19 PM

scope is 192.168.x.1 to 192.168.x.254

like i mentioned before i have about 30 addresses which are excluded...

what other DHCP settings would u need....

shaha · 09-19-2007, 07:02 AM

Anyone??????????????????????????????????

ecrocombe · 09-20-2007, 08:16 AM

RRAS does have trouble giving addresses back aswell as reserving them for itself.
i would recommend getting RRAS to give addresses out from a pool rather than relaying them from DHCP.

shaha · 09-20-2007, 08:25 AM

thanks for the reply...

how do i do that...i was doing some reading on RAS and DHCP....can you tell me where i have to go and set that up...thanks...

ecrocombe · 09-22-2007, 10:31 PM

in the RRAS console, right click on your server name then click properties. under the IP tab click on "static address pool" then enter the range of ip address.

shaha · 09-24-2007, 07:08 AM

Thanks. I will try that. Do I need to add that pool in the exclusions in the DHCP console?

shaha · 09-24-2007, 08:17 AM

Nevermind. I found out that you DO have to add that pool in the exclusions.

But it still dosent make sence!!!!!! There are atleast a hundred address are not being given out. I cant see them in the address leases and I cannot see them in the exclusions and I cannot ping them......?????...so where the heck are they!!!!!! The statistics show that only 1 or 2 are availble where there should be atleast 100 of them...??????

Thanks.

ecrocombe · 09-24-2007, 09:15 AM

you should have the RRAS pool on a different subnet to stop confusion, also so that RRAS has nothing to do with DHCP to terminate if this is your problem. (RRAS does not always make sence to some people. its a bit hard to wrap your head around what it is actually doing.)

shaha · 09-24-2007, 09:26 AM

Thanks for the help.

So you think the RRAS is the problem....

Actually I dont really want to make another subnet just for RRAS. We have about 2-5 people using terminal services are any given time so I just took 8 address and put them in them in the exclusions and the static pool for RRAS.

If RRAS is the one "holding" those address which are not being used, then how can I make it release so DHCP can give it out?....If RRAS is indeed the problem.....

ecrocombe · 09-24-2007, 05:18 PM

Yes, i do think it is RRAS.

i still would recommend having RA clients on a different subnet to get rid of the possibility altogether, it isn't a big deal should usually be done that way regardless of if they have this issue or not.

i would either wait now untill the address timeout and see if that has fixed the problem or delete RRAS altogether and start again.

are you working with server 2000? or 2003?

shaha · 09-25-2007, 06:45 AM

I have Windows 2000 server.

Thats what I was leaning towars. Since I made the changes, I will wait for sometime to see if all the other addresses get released and if that fixes the problem, if not then we will see. Thanks for all your help.

ecrocombe · 09-25-2007, 09:23 AM

there was an issue with srv2000 that was resolved in service pack 2 or 3 that correspondes to your problems. what service pack do you have installed on your server?

shaha · 09-25-2007, 09:27 AM

Service Pack 4.

shaha · 10-01-2007, 09:21 AM

I am still having issues with this. I has been over a week now and some addresses are still not being given out. I had to staticly assing an address to one my users. Where are the rest of these addresses???????

shaha · 10-05-2007, 01:22 PM

FIXED!!!!!!

Right click on the scope and select reconcile. Not sure why I didnt think of this before. The reconcile checks the DHCP DB against the server's registry and makes changes with the descripencies accordingly. Once I did that every one of those missing address showed up and are now avalible. Thanks.

09-14-2007, 11:28 AM	#1 (permalink)
shaha Registered User Join Date: Sep 2007 Posts: 13 OS: XP	DHCP - IP running out Hello all. My DHCP server says that its running out of addresses but I have only 100 leases. My scope is of about 225 addresses but under scope leases I only see about 100 computers/leases. Where are the rest? I had to change the lease duration to 1 day but that didnt help too much. If I go through the list of leases and find ones that are not in there and ping them, I get no replies. That means that they are availble but DHCP is not giving them out....????? Some users do also connect via RDP so some leases show up as RAS. Any clues???????? Thanks guys. ps...I do have an some exclusion of about 30 addresses. But there should be another 100 or close to it. They all cant be being used. I have to go and delete some addresses to give to users.... Thanks.

09-14-2007, 12:05 PM	#2 (permalink)
Cellus Moderator Networking Team Join Date: Aug 2006 Location: Canada Posts: 2,664 OS: Windows Vista Business SP1, Windows XP Professional SP3 My System	Re: DHCP - IP running out What is the DHCP scope set at right now? What are the other DHCP settings? __________________ TSF Networking Team Virus/Trojan/Spyware Removal Help Donate!

09-14-2007, 12:19 PM	#3 (permalink)
shaha Registered User Join Date: Sep 2007 Posts: 13 OS: XP	Re: DHCP - IP running out scope is 192.168.x.1 to 192.168.x.254 like i mentioned before i have about 30 addresses which are excluded... what other DHCP settings would u need....

09-19-2007, 07:02 AM	#4 (permalink)
shaha Registered User Join Date: Sep 2007 Posts: 13 OS: XP	Re: DHCP - IP running out Anyone??????????????????????????????????

09-20-2007, 08:16 AM	#5 (permalink)
ecrocombe Registered User Join Date: Apr 2007 Posts: 109 OS: SBS2k3R2, WIN2k3, XP, 2000, NT My System	Re: DHCP - IP running out RRAS does have trouble giving addresses back aswell as reserving them for itself. i would recommend getting RRAS to give addresses out from a pool rather than relaying them from DHCP.

09-20-2007, 08:25 AM	#6 (permalink)
shaha Registered User Join Date: Sep 2007 Posts: 13 OS: XP	Re: DHCP - IP running out thanks for the reply... how do i do that...i was doing some reading on RAS and DHCP....can you tell me where i have to go and set that up...thanks...

09-22-2007, 10:31 PM	#7 (permalink)
ecrocombe Registered User Join Date: Apr 2007 Posts: 109 OS: SBS2k3R2, WIN2k3, XP, 2000, NT My System	Re: DHCP - IP running out in the RRAS console, right click on your server name then click properties. under the IP tab click on "static address pool" then enter the range of ip address.

09-24-2007, 07:08 AM	#8 (permalink)
shaha Registered User Join Date: Sep 2007 Posts: 13 OS: XP	Re: DHCP - IP running out Thanks. I will try that. Do I need to add that pool in the exclusions in the DHCP console?

09-24-2007, 08:17 AM	#9 (permalink)
shaha Registered User Join Date: Sep 2007 Posts: 13 OS: XP	Re: DHCP - IP running out Nevermind. I found out that you DO have to add that pool in the exclusions. But it still dosent make sence!!!!!! There are atleast a hundred address are not being given out. I cant see them in the address leases and I cannot see them in the exclusions and I cannot ping them......?????...so where the heck are they!!!!!! The statistics show that only 1 or 2 are availble where there should be atleast 100 of them...?????? Thanks.

09-24-2007, 09:15 AM	#10 (permalink)
ecrocombe Registered User Join Date: Apr 2007 Posts: 109 OS: SBS2k3R2, WIN2k3, XP, 2000, NT My System	Re: DHCP - IP running out you should have the RRAS pool on a different subnet to stop confusion, also so that RRAS has nothing to do with DHCP to terminate if this is your problem. (RRAS does not always make sence to some people. its a bit hard to wrap your head around what it is actually doing.)

09-24-2007, 09:26 AM	#11 (permalink)
shaha Registered User Join Date: Sep 2007 Posts: 13 OS: XP	Re: DHCP - IP running out Thanks for the help. So you think the RRAS is the problem.... Actually I dont really want to make another subnet just for RRAS. We have about 2-5 people using terminal services are any given time so I just took 8 address and put them in them in the exclusions and the static pool for RRAS. If RRAS is the one "holding" those address which are not being used, then how can I make it release so DHCP can give it out?....If RRAS is indeed the problem.....

09-24-2007, 05:18 PM	#12 (permalink)
ecrocombe Registered User Join Date: Apr 2007 Posts: 109 OS: SBS2k3R2, WIN2k3, XP, 2000, NT My System	Re: DHCP - IP running out Yes, i do think it is RRAS. i still would recommend having RA clients on a different subnet to get rid of the possibility altogether, it isn't a big deal should usually be done that way regardless of if they have this issue or not. i would either wait now untill the address timeout and see if that has fixed the problem or delete RRAS altogether and start again. are you working with server 2000? or 2003?

09-25-2007, 06:45 AM	#13 (permalink)
shaha Registered User Join Date: Sep 2007 Posts: 13 OS: XP	Re: DHCP - IP running out I have Windows 2000 server. Thats what I was leaning towars. Since I made the changes, I will wait for sometime to see if all the other addresses get released and if that fixes the problem, if not then we will see. Thanks for all your help.

09-25-2007, 09:23 AM	#14 (permalink)
ecrocombe Registered User Join Date: Apr 2007 Posts: 109 OS: SBS2k3R2, WIN2k3, XP, 2000, NT My System	Re: DHCP - IP running out there was an issue with srv2000 that was resolved in service pack 2 or 3 that correspondes to your problems. what service pack do you have installed on your server?

09-25-2007, 09:27 AM	#15 (permalink)
shaha Registered User Join Date: Sep 2007 Posts: 13 OS: XP	Re: DHCP - IP running out Service Pack 4.

10-01-2007, 09:21 AM	#16 (permalink)
shaha Registered User Join Date: Sep 2007 Posts: 13 OS: XP	Re: DHCP - IP running out I am still having issues with this. I has been over a week now and some addresses are still not being given out. I had to staticly assing an address to one my users. Where are the rest of these addresses???????

10-05-2007, 01:22 PM	#17 (permalink)
shaha Registered User Join Date: Sep 2007 Posts: 13 OS: XP	Re: DHCP - IP running out FIXED!!!!!! Right click on the scope and select reconcile. Not sure why I didnt think of this before. The reconcile checks the DHCP DB against the server's registry and makes changes with the descripencies accordingly. Once I did that every one of those missing address showed up and are now avalible. Thanks.