Program Changing DHCP Server IP Address Scope

Jul 11, 2011

My Network is running Windows Server 2003 and with more than 150 Users. But last week, I notice that a program is changing my DHCP server IP Address scope.

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DHCP Assigning Address Outside Of Scope

Jul 1, 2012

I am using Windows 2011 SBS and Windows 7 clients.My server has a DHCP range of 192.x.x.150 to 192.x.x.199 and all other I.P. addresses are static. On a workstation located at I.P. 192.x.x.13 I am seeing an address conflict.When I perform an "nbtstat -a 192.x.x.13" command from the server I am given the logical computer name of a staff members personal laptop.Investigation of the laptop reveals that it is set to DHCP, and clearly the address of 192.x.x.13 is outside of my servers DHCP scope, so this I.P.should never be assigned, let alone in duplicate.I Google this topic before posting, and it was suggested that IPv6 could be having an adverse affect. I determined this because I performed a ping on the laptop and only got a MAC address back rather than an I.P. address.However after unticking IPv6, and rebooting, the laptop is still causing havoc.I can set a static I.P. address on the laptop, however this is not ideal.

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Cisco :: 5508 Is There A Way For Internal DHCP Scope To Release Scope Addresses

Apr 7, 2013

DHCP scope is configured on a WLC 5508.I'm checking if there' a way for WLC to clear the dhcp leasing when a user is diconnected from wireless?

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Cisco Switching/Routing :: 120 IP Address From Incorrect Scope Is Assigned From DHCP

Jul 8, 2012

I am trying to setup VLANs and most of configurations are working ok now except IP address assignment from DHCP. If any computer in VLAN 120 or 130 configured with manual IP address, then all works fine. It can reach internal servers and the internet without problem.If the IP address is assigned automatically then any computer in VLAN 120 or 130 are obtaining  IP address (strangely!) from VLAN 100. Because switch ports that connected to the computer belongs to VLAN 120 or 130, the computer cannot reach internal servers and the internet with ip address from VLAN 100 . All SVI interfaces for VLAN 100, 120 and 130 have ip helper-address option defined pointing to the DHCP server. No DHCP snooping enabled on all switches at this point. DHCP server have three scopes for the three different VLANs.

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Cisco Wireless :: 5508 Controller And Changing Windows Dhcp Server

Dec 5, 2012

We have a 5508 controller authenticates with WPA2-enterprise to 3 possible AAA servers.  Today I tried migrating our DHCP server from a Windows 2003 machine to Windows 2008 R2.  Migration went smoothly and all wired clients could get IP's.  Reservations intact, scopes intact, etc.. you name it.  I though it was a great success.
Fast forward about an hour when people started coming into work for the day. Calls started coming in about their laptops not able to connect to the network.  I double checked with a spare laptop in our IT department and also my iPhone.  Same issue.  Seems the only thing I changed today was the DHCP server (from to
After racking my head on it for awhile, I re-enabled the "old" dhcp server ( and disabled it on the new (  Instantly wireless clients were able to connect.
Am I missing some configuration step in the 5508 controller when moving DHCP servers?  I do plan on running 2 DHCP servers ( and for redundancy once I get the primary one moved over and working correctly.
I want to decommision the older 2003 server.  Its time to raise the domain functional level.

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Cisco Firewall :: ASA 5510 Server's NAT Address Not Changing

Nov 16, 2011

I added a new server and created a new static NAT assignment on the ASA 5510 to the server's IP.  When I browse to the web to check what public IP it's reporting, it shows the wrong IP.  I disabled the network interface on the server, ran "clear xslate", reenabled the network interface, ran "sho xlate" and while the correct translation was in the table, the server still reported the wrong IP address.I even ran a packet trace and it showed the IP address being correctly translated to the proper public IP, but when I browse to the web I get the same erroneous public IP. [code]

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Cisco :: DHCP Scope Not Handing Out Addresses

May 21, 2012

I've created a tonne of dhcp scopes on my routers before never had any issues, however this one will not hand out any addresses at all, i even give the router a reload to see if any magic happened but nothing, ive ended having to put a temp server in with just dhcp installed until i get the router diong what it should my config below, its something simple i havent seen, as ive compared it to plenty of my working DHCP configs and seen nothing.

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Change DHCP Scope To Match Corporate IP Scheme

Oct 3, 2012

I change DHCP scope to match corporate IP scheme Friday came back To discover only some stations picked up new leases from the scope.

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Cisco Firewall :: DHCP Scope Limitations For ASA5505

Feb 22, 2013

I have a ASA5505 that i have running asdm 6.4 on it and have tried setting up some DHCP scopes for the interfaces.I have the security plus key.I set up 4 interfaces all with different subnets and all with different DHCP being doled out by the firewall for the time being.Anyway, 3 of the 4 work.I have tried to change interfaces wondering if there was an issue with that phy device.I tried enableing the subnet that would not work first and it didnt matter still would not issue dhcp.the other 3 work fine.Is there a limitation to the amount of scopes that will issue dhcp for an asa5505 ?

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Cisco Wireless :: 4402 - DHCP Scope Increase And Changes In Wlc

Feb 6, 2013

i am using wlc 4402 with a mgt ip 172.26.150.x/24 and ap manager ip 172.26.150.x/24, my all ap get the ip address from dhcp . currently in dhcp server to 254 dhcp scope is configured. at mysite some devices are configured like ipad,iphone or galaxy tab with mac binding in dhcp server. now this pool is almost full. i have a policy configured for these devices for mac binding is done in DHCP. to increase pool what are the changes i need to do in wlc. what are the changes i need to do in dhcp server . is policy made for mac binding in dhcp server will get affected by this ?

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Cisco Wireless :: 5508 - Same SSID With Different Dhcp Scope On Same Controller

Aug 10, 2011

I have a 5508 WLC controller at the HQ with the employee ssid ,the dhcp scope on the ssid is network.
However,I want this same ssid to be brodcasted to a remote site using HREAP access point but with  different dhcp scope
I have tried creating another interface for the remote site with a different dhcp scope( but the controller wont allow me create another wlan with same ssid that existed before to apply the new interface created for.

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Cisco Wireless :: DHCP Scope And VLAN Switch SG300?

Feb 16, 2012

I did the config below but unable to obtain the ip from the subnet scope The switch is in the layer 3 mode.
no spanning-tree
vlan database
vlan 2
voice vlan oui-table add 0001e3 Siemens_AG_phone________
voice vlan oui-table add 00036b Cisco_phone_____________
voice vlan oui-table add 00096e Avaya___________________


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Cisco :: 5508 VLAN Select - DHCP Leases On Each Scope For Same Client

Sep 11, 2011

The 5508 is running code  I have created a group interface for 3 subnets and assigned the group to the WLAN.  Clients are getting IP addresses in a round robin fashion.  The issue or downside to this is if the lease has not expired before the next time the station connects to the WLAN it consumes an address on another subnet instead of grabbing the unexpired lease IP address on it's previous VLAN.  It seems that the WLC determines the VLAN in the interface group before the DHCP request from the client in case the client already received a DHCP address that has not expired.  This can be problematic since we have seen some iPhones requesting an address every 20 minutes thus consuming an address on every subnet in the interface group.  Other than setting a lease time extremely low what can be done to address this?

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Cisco Switching/Routing :: Adding A New DHCP Scope To 3750 Stack

Apr 2, 2012

The company I work for owns a remote manufacturing facility that houses a stack of five 3750 switches that function as the core switching system for the plant.  DHCP services are configured on the 3750 stack.
There are currently three VLANs configured, one for data and one for voice (144 and 244 respectively) and one for UCM servers (200), with corresponding subnets of /19, /19 and /24.
The current DHCP scope configurations are as follows:
ip dhcp pool Plant-44_DHCP

My question is will the addition of this scope in the manner presented cause any problems with PCs or IP phones outside the targeted recepents receiving the wrong IP information from this scope? 
I plan to identify the users that should be members of this VLAN 444 and change the switchport mode access configuration on the corresponding switch ports from VLAN 144 to VLAN 444.  The voice VLAN 244 will remain the same.

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Cisco Wireless :: New 5508 Not Handing Our Correct IP Address Scope To Clients

Jan 15, 2013

Just inserted a new 5508 WLC into the network. We current have 3 4404 WLCs, and there was a need to duplicate, as much as possible, the configurations on the 4404s, and the design. The 5508 came online as expected. We moved a few access points over to it. The APs got the correct address range. The clients are expected to get addresses in the same scope range as the APs. However, the clients are receiving addresses in the management IP scope.I know there are two "not a good way to do it" in here. Why is the management address range in the DHCP scope, and why are the clients using the same scope as the APs. We are going to change that. For now, the AP and client in the same range has been going on since we rolled out wireless in 2006.The 8 ports on the 5508 are configured for LAG. There is no dedicated port for management. They tell me not to do that on a 5508.

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Did Not Receive IP Address From DHCP Server

Nov 17, 2011

i did just had a rogue anti-virus infection i did a removal of it AV Security 2012

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IP Address Lease Denied By DHCP Server?

May 5, 2013

my Laptop is about nine years old, HP Pavillion Pentium 4. I run Windows XP Home Edition Version 2002 SP3. I use a broadband card from Verizon that I just put in my USB (no router, etc) I'm getting a System Error Source DHCP Event ID 1002. When this happens, my computer, I believe, is going into sleep mode and I have to reboot the system. When I turn it back on and go back on the internet, all my websites that I was in are still there. The error says: The IP address lease for the Network Card with Network address 2c3068c16ED1 has been denied by the DHCP Server (The DHCP Server sent a DHCPNACK message)The DHCP Server Service did not extend the lease on your computer's IP address, so your computer temporarily lost its connection with the Network. I tried the ipconfig /release and ipconfig /renew. I tried going in services.msc and going under DHCP and keeping it automatic but stopping it. I called Verizon and I believe he refreshed my Network settings (I think I knew more about the topic than he did) He said it was my computer, whatever. I just tried the static IP but it didn't seem to take. I restarted and it jumped back to automatic. My last guess is it's something to do with the time frame of when it automatically obtains the address and when it expires. When I do the ipconfig /all it shows only a two hour time frame before it expires. Today I noticed that my computer shut down/sleepmode at the exact time the ipaddress was obtained. So, is there a way to increase this time between obtaining and expiring?

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DHCP Server And Automatic Private Address?

Sep 7, 2011

I'm a heavy PC Gamer, I play games such as World of Warcraft, Borderlands, Call of Duty, Steam Games, I also know my way around fixing internet issues, But this one just seems to have gotten me off guard, Recently, 1-2 days ago, I was browsing the internet like a normal day, and It was late, so I decided to go to sleep, Turned my computer off, Woke up the next morning, Turned it on, It then shows that I kept getting kicked off the LAN for some reason, It was like this[CODE]

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Cannot Renew IP Address - Unable To Contact DHCP Server

Mar 31, 2013

I randomly lost Internet connection, and since have not been able to Renew an IP address! Other people in my household can connect just fine. I've tried numerous things to get my internet back, but continue to be unsuccessful in doing so.

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:Documents and SettingsMike>ipconfig /all
Windows IP Configuration
Host Name . . . . . . . . . . . . : miker
Primary Dns Suffix . . . . . . . :


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Cisco Wireless :: LAP1141n - Can't Get IP Address From DHCP Server

Feb 1, 2012

Is it problem with iPads or LAP1141n?WLC 4404 and many 1142 and 1141, so other devices laptops, iphones, androind phone works as well.But iPad authorized, but can't get an ip address from dhcp server (dhcp not local on wlc, on windows machine) with coverage lap1141, but it get ip with coverage lap1142, and when i got it i roaming to lap1141 and it stays, if i off/on iPads can't get it again from lap1141.

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Dell :: Vostro 270s Will Not Get IP Address From DHCP Server

Jan 21, 2013

2 brand new Vostro 270s straight out of the box both have the same problem. (Windows 7 PRO)

These are connected to a wired LAN, the NIC fails to find the dhcp server and get itself an ip address. The network cable & port work fine with any other PC. If I change the properties in the NIC to a static IP address it works fine.

I have tried every Realtek driver I can find, both from DELL and Realtek, no difference.

I have wiped one of the machines and re-installed a fresh copy of Win 7, then the chipset drivers (from the DELL supplied CD) - no difference.

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Cisco Routers :: Get The RVS4000s DHCP Server To Assign Another IP Address?

Feb 4, 2013

I have a RVS4000 router with DHCP enabled and in router mode. 
The LAN is 192.168.2.x.  The RVS4000 static IP address is
The router is not the RVS4000 and is at
The RVS4000 dhcp is assigning it's clients a default gateway of instead of what I want How can I get the RVS4000's DHCP server to assign another IP address other than its own as the default gateway to its DHCP clients?

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Cisco Wireless :: 3750 Switch - DHCP Server / Cannot Get IP Address

Jan 8, 2012

I have a 1250 AP connected to an Switch Cisco 3750. We have a SSID(v lan 1 - native) which get an IP Address from our DHCP Server(located in a Windows 2003 server). I added a new SSID in VLAN 2 and I would like no to use the DHCP Server but to make the AP get an IP Address from the pool I created in the own AP (ip dhcp pool Guest) but every time I try to connect the new v lan, it doesn't get an ip address.
Follow the settings of the AP.
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption

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Cisco Wireless :: WLC 5508 As Dhcp Server For AP Management Address

May 26, 2013

My 5508 WLC which runs version 7.4 is configured as a DHCP server for the AP management and here's my problem: My AP can get to the address, and can ping the address of the WLC management,But my AP prompts the following log: [code]

In the switch dhcp we can use to do the WLC option43 specified address, but in this case how the address specified WLC, the AP can be registered up?

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Cisco Wireless :: WLC 5508 - Lightweight AP Client Getting Wrong IP Address From DHCP Server

Mar 29, 2012

I have 2 units Cisco WLC 5508 running software version 7.0.220 with 70 over units Cisco AP 1262N and 1242AG. Some of wireless clients having problem to get the correct IP address from the DHCP server. There are 2 units of Microsoft DHCP. Both DHCP server ip have been configured on the Interface at the WLC. The core switch also being configured with ip helper. I've attached the debug output of one of the wireless client during the problem.

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Cisco Switching/Routing :: 3750 - DHCP Server Doesn't Provide IP Address

Dec 11, 2012

a new LAN installation, two VSS pair 6509 core, 15 closets, with 3750 stacks. Floor 15 only, devices/hosts can ping teh DHCP server but cannot aquire IP addresses. no such problem on other floors?
portfast an dother parameters are intact.

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Cisco Switching/Routing :: 3911 Router DHCP Server Not Giving IP Address

Jan 30, 2011

I have a 3911 router with a 1242 AP. The problem that I have is that when the user is trying to connect, the user get the OS Ip address and I see that when I do the "show dot11 association" command, but when I do sh ip dhcp binding on the  router I see        0100.18de.74db.14       Jan 31 2011 11:14 AM    Automatic
The router is seeing as if the router gave the ip address to the user, but the reality the user was assigne the OS ip address 169. I did "debug ip dhcp server events" and I got the following:
Jan 31 11:09:06.752 EST: DHCPD: Seeing if there is an internally specified pool class:Jan 31 11:09:06.756 EST:   DHCPD: htype 1 chaddr 0100.18de.74db.14
Jan 31 11:09:06.756 EST:   DHCPD: remote id 020a00000a58218400000000Jan 31


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Cisco Routers :: How Many IP Address DHCP Server Can Handle Of RV0xx Series VPN Router

Sep 6, 2011

How many IP address can handle the DHCP server of the RV0xx Series VPN router? can be configured for more than 250 ip addresses? it is posible to configure the router in order to have more than 250 ip address?

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Cisco Switching/Routing :: Nexus 7010 New Users Were Not Getting Ip Address From Dhcp Server

Jun 8, 2013

We  have 2 nexus 7010 switches configured with HSRP in the network. For all  the vlans core1 is Master and Core2 is standby. In the current setup we  have external dhcp server and dhcp relay is configured for all the  vlans on Master and standby switch. The setup is running the IOS 5.2
Activity Done: During  the Maintainacne activity, we isolated core1 switch in the network by  disabling the vpc/keepalive and all the uplinks from access switch. The  core2 switch was master for all the vlans.
Issue observed: It  has been observed that new users were not getting ip address from the  dhcp server. The ethereal capture showed that dhcp server was not  getting the dhcp requests from the core2 switch. We disabled the dhcp  feature in core2 and enabled again with dhcp relay again configured on  vlan interfaces .even after doing this no change was observed in  behaviour. Finally we got core1 back in network by enabling all the  links.
Observation: The  moment VPC link came up between the core switches, users started  getting ip's from dhcp. Then we started enabling all the uplinks on  core1.Core1 again become master for all the vlans and users continued  getting ip’s. Network running fine.
Further Testing

1. For  one of the vlan, core 2 switch has been made primary and for new users  checked the dhcp functionality and it was working fine. The aim was to  identify if anything wrong on core 2 related to dhcp relay

2.Again  we changed the priority for this vlan and made core1 master for the  same. This time we disabled this vlan on core1 and tried new user with  core 2 became master and dhcp functionality worked fine for new user.  Actually in this case we have simulated the same behaviour when we  observed the issue with only difference of VPC was not available during  the issue time as core 1 was isolated form network 
Inputs needed.

Is  there any known behaviour for dhcp functionality when VPC is  unavailable? If we see the test scenario2 (wherein core1 was master for  the vlan and we disable this vlan on core 1 and core 2 was able to relay  dhcp requests for new users in this vlan.) it was actually same as  scenario we observed during issue time..

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Dell :: L501x Administrator Profile Failed To Obtain IP Address From DHCP Server

Feb 20, 2013

2 days ago, my laptop was connected to my router and working fine. But it then randomly disconnected and haven't been able to connect back since. I am using an ethernet cable to access the internet, and have tried many ways to try and resolve the issue but nothing is working.

I have a Dell L501x (Win 7 64-bit) with the Intel Centrino 1000 BGN wifi card. I have restarted the router and modem and disconnected all devices and tried reconnecting, but to no avail. I have tried updating the drivers, system restoring and using safe mode (with network) but nothing works. The modem and router are working fine as other devices connect and access the internet, it is just my laptop that cannot. 

I am sure it is not a hardware issue as the card detects all the surrounding networks. The troubleshooter only says "An administrator profile failed to obtain an IP address from the DHCP server.

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Cisco Wireless :: 1141 - Get 12.4 Code To Assign DHCP Address To Ethernet Interface From Server?

Nov 7, 2012

How do i get the 12.4 code to assign a dhcp address to my ethernet interface from my server? I deleted the default config on the 1141 and searching has not turned up anything useful.

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Cisco Routers :: RV220W Built-in DHCP Server Can't Save Class B IP Address Pool

Mar 28, 2012

I was trying to set a DHCP pool with with RV220W, however, RV220W UI can't save it. It displays "IP Address Range -"Step to reproduce: (it is 100% reproducible)

1. login into RV220W admin web

2. Create a VLAN, id 201

3. Go to "Multiple VLAN subnets", select the VLAN, click edit

4. Enter following info:
IP Address:
Subnet Mask:
DHCP Mode: DHCP Server
Domain Name: Cisco
Starting IP Address:
Ending IP Address:
Primary DNS Server:
Leave rest of settings with default value.
DNS proxy is enabled
5. Press Save button. The UI shows text "IP Address Range -".

Expected result: RV220W shall save the setting and make use of subnet in IP pool. By the way, the error message "IP Address Range -" seems incompleteI tried same setting on netgear FVS318N (very similar settings to RV220W), it accepts as DHCP IP pool and works.RV220W has great feature set meets my needs. Its UI is slow and sometime dashboard freezes, which I can live with comparing to features. But DHCP server IP pool can't be class B is huge limitation to me.

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Cisco Switching/Routing :: Can Layer 2 2950 Switch Be Used As DHCP Server With Its Own Address Pool

Mar 18, 2009

Can a layer 2 cisco 2950 switch be used as a dhcp server with it's own address pool.

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