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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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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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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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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Jun 25, 2011
I just got a brand new laptop and I can't get it to connect to LAN.It's plugged in to the same hub as my main machine and I can't even access my router UI.It's not the cable because I tried plugging in my main machine's cable to the new laptop and the same thing happens.ipconfig reveals an Autoconfiguration IPv4 Address of: 169.254.197.187 But that number should say 192.168.1.1xx I've tried uninstalling and reinstalling the Ethernet driver as well.I've tried resetting the router and modem.I've tried resetting TCP/IP.
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May 20, 2012
The problem is WAP 610n not assigning IP address through DHCP; i have to add IP address mannualy.
just go through the details below:
In my network environment we are using :
CISCO Router 800 series; IP: 192.168.1.1
Domain server with DHCP server : 192.168.1.2
DHCP pool: 192.168.1.234 - 192.168.1.250
WAP IP : 192.168.1.236
WAP configuration :
configuration view : mannual
Wireless band : 2.4 Ghz
Network mode : mixed
channel width: 20 Mhz only
standard channel : auto
SSID broadcast : Disabled [ for security reason]
Security mode : WPA2 Personal
Encryption : TKIP/AES
Firmware : 1.0.01 build 94, Oct 26, 2009
Note: In status menu it is not showing any default gateway.
Encapsulation method in CISCO router : PPPoA [ as instructed by ISP]
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Nov 20, 2011
The DHCP/DNS server is on ip address 10.1.100.103 with an alt on .102 I'm attempting to integrate a 4510R+E into an existing network and use existing DHCP/DNS windows 2008 server to push out IP addresses to connected computers.
I want to assign a VLAN to every port for management purposes and then I put an IP helper address on every VLAN.
I've attached a the 4500E partial config. I'm attempting to get Gi1/44 to a state where I can plug a computer into it an resolve an ip address and gain internet access like all the devices on the existing network can do.
I've created a new scope in DHCP with the ip subnet of 10.60.211.0 255.255.255.0 It leases addresses from .1 to .253
The computer will not resolve ip addresses with this config.
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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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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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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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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 172.26.150.3 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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Aug 10, 2011
I have a 5508 WLC controller at the HQ with the employee ssid ,the dhcp scope on the ssid is 10.120.0.0/16 network.
However,I want this same ssid to be brodcasted to a remote site using HREAP access point but with different dhcp scope 10.102.0.0/16.
I have tried creating another interface for the remote site with a different dhcp scope(10.102.0.0) 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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Feb 16, 2012
I did the config below but unable to obtain the ip from the subnet scope 10.10.9.0. The switch is in the layer 3 mode.
no spanning-tree
vlan database
vlan 2
exit
voice vlan oui-table add 0001e3 Siemens_AG_phone________
voice vlan oui-table add 00036b Cisco_phone_____________
voice vlan oui-table add 00096e Avaya___________________
[code]....
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Sep 11, 2011
The 5508 is running code 7.0.116.0. 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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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 10.44.32.0 /19, 10.44.0.0 /19 and 10.44.100.0 /24.
The current DHCP scope configurations are as follows:
ip dhcp pool Plant-44_DHCP
network 10.44.32.0 255.255.224.0
default-router 10.44.33.254
[Code].....
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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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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Dec 16, 2010
I am replacing an older AP with a new 1252 unit. I attached everything and powered it up, but my DHCP server does not appear to be finding it and assigning an IP address. The status light stays green and the ethernet light blinks randomly green. Seems to be connected fine, but without an IP I cannot configure it to use it.
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Jan 31, 2011
DHCP is assigning multiple leases per machine. The server itself grabs about 10 IPs with Unique ID "RAS"
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May 26, 2012
I am trying to give an static ip address to a time clock on my network and for some reason when I connect time clock to network it will always get an ip address from a different network. for example my computer IP address is 192.168.2.70 when connected to network, my default gateway is 192.168.2.1, the IP address that the time clock always gets is 192.168.1.120, there is no way to tell the time clock what IP address I wanted to be it has to get it from router (that is what the manufacturer told me), router (16portLiksys) does not have DHCP enabled the guy who set up network left it disabled, on his notes he says server (dell server T110) is acting as router is that true that a server can be acting as router?what do guys think is going on here?all the computers hooked up to network have static IP address.I also notice that when I connect a computer to router it will get an IP address from different network the same as time clock.I tried to reserve ip address on router by entering MAC address from time clock but it won't work. I am not very familiar with the server settings I have not try changing settings on server, I am not even sure the guy who set up network is right about using server as router.
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Jun 19, 2012
This is IOS 15.1(4)M3 on a 1921 router. The LAN is 192.168.42.1/24. (DHCP config is further down.) We have a small range that we want to assign via DHCP to devices; .200 through .220 . At the same time, we have a handful of Macintosh systems to which we want to assign a specific address that is not in that 200-220 range. I don't want to configure the assignment based on the Ethernet MAC addresses because these systems might connect via UTP or wireless; that is to say, they have more than one MAC address. They only ever connect using one interface/MAC address at a time, but it's their choice; in some areas wi-fi is available, and in some areas they have to cable-up.
The Mac OSX network settings has a field for "DHCP Client ID". It would be much easier to tell the users of these systems to put their Mac's name in the Client ID field for both their wired and wireless DHCP configs. (As opposed to having them all lookup, and then give me their Ethernet MAC addresses for both of their interfaces.) I tried this with my Mac's (named "shrike") wi-fi interface, but I don't get the 192.168.42.14 address that I expected. I get an address from the .200 to .220 range.
Here's the DHCP-related config from the router:
router#sh run | s dhcp
ip dhcp excluded-address 192.168.42.1 192.168.42.199
ip dhcp excluded-address 192.168.42.221 192.168.42.254
ip dhcp pool OurOffice
network 192.168.42.0 255.255.255.0
[code]....
Is "client-name" the wrong place to configure the DHCP Client ID?
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Jan 7, 2013
HP wifi printers (I've had 2 over the last several years)eventually have a disconnect with my wifi router and was told (by an experienced IT guy from my last job) I should assign the printer a static address to eliminate the problem. How can I assign a static address to my printer. Here are the models Router: Belkin model F5D9231-4v1(01); Printer HP Officejet 6600. I know how to access the printer and manually enter an IP address and subnet and such, I just don't know which numbers to use where. I also know how to access my router, via typing in the IP address in Internet Explorer, but i'm unsure of which tab within the router's page (i.e. is it category wirelessunder MAC address control) or which numbers (IP address or MAC Address)and where should I get the correct numbers from (i.e. go run, cmd,IPconfig/all).
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Oct 12, 2011
We once had a virtual server with two network adapters, one was internal and the other was external, and people could access it directly from the internet.
That server recently, died (someone put the .VHD file on a massive RAID 0 array, and that went boom), and I need to set it back up again. All the DNS entries appear to still be there, but how to assign the external IP to the network adapter. I tried Google, but my Google-fu must be weak today as I can't find anything useful.
It's a Server 2008 R2 machine running inside Hyper-V. Nothing's changed except for the new Windows install, it's running with the exact same VM settings, which I didn't touch except to add a new VHD.
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Jul 25, 2012
My company wants to create a VPN Tunnel to allow a remote office to connect to ours. I purchased 2 ASA 5505 and I was expecting to be able to set this up without any issues. Sadly, that is not the case.
What I'm having trouble with is configuring my Public IP Address to the device. I go through the setup wizard and enter the IP Address like normal, but I have no option to input my ISP's subnet, Gateway or DNS. Without those, I get no internet connection. I know there is a way to do this, but I'm stumped.
My Specs:
2 ASA 5505 series
ISP Modem (Which they control) - SMC SMCD3GN with DHCP disabled
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Oct 25, 2012
hrome threw me a DNS lookup failed. I go into my network settings and I noticed that I had limited connectivity. It would switch between no network access and no internet access every few seconds. After a bit of fiddling around, I got it to connect through assigning myself a static IP. This isn't exactly convenient because I use this computer on multiple networks. When I try to have it on automatic IP, I get no IP address or default gateway when I do an ipconfig /all. It would appear that my router quit assigning my laptop an IP for no reason whatsoever. DHCP is enabled on the router, and all other devices work fine. What could possibly be the problem here? I'm 99% sure it's not an IP conflict either. It's not being MAC filtered because I'm on the thing right now posting this through a static IP. It's not my A/V because it's worked great in the past. Perhaps I should also mention it occasionally says "unidentified network" instead of the SSID
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Jan 22, 2012
I'm fairly new to Cisco configuration and I am looking at a problem for a client that involves the use of a Cisco 887 (wired only) as the main router/gateway. The problem I am investigating involves the allocatoni of DHCP addresses from the device to a product we have designed that connects to the router. I am attempting to set the 880 up on the bench with no ADSL connection and just use the DHCP feature of the box for the 4 switch ports on the back. I have tried all kinds of configurations from default. Whatever I do I can't get the router to assign an IP address to anything that is plugged in (Windows or Linux machines). What could I be doing wrong ? It can't be that difficult to get the system to just act as a DHCP server.
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Feb 16, 2013
some problems when I was trying to install my X3000 as a DSL modem and router.I had to assign a designated IP address but I have dynamic IP from my internet supplier. I can't get pass the stepp of assigning IP address.
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Apr 3, 2011
Is there anyway you can assign a static IP address within WAG160Nv2 to peripherals such as an XBOX?
The knowledge base only seems to show how to assign an IP address in the XBOX but when I have to reboot the router, I've noticed the XBOX is assigned a new IP address when viewed in the router pages.
If I set a permanent IP address in the XBOX, this will no longer match what is in the router.
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Apr 9, 2012
Recently purchased 5 SGE2010P 48-port switches to replace older L2 switches. I have 4 switches in single stack and one as a standalone. Both the stack and standalone will connect to at least 1 Dell 2724 switch. Both the stack and the standalone Cisco are in Layer 3 mode.
I have created several VLans on the Cisco switches, and am trying to assign an IP address to the VLan, but cannot seem to figure out the web gui. Each time I try to use Systems > System Management > IP Addressing > IP Interface, then click Add, it simply changes the existing IP of the management interface. So, I'm not sure how to go about assigning an IP Address to an Vlan.
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Aug 1, 2011
I am running a Dell Inspiron 530 with Windows XP SP 3. My computer is displaying cannot aquire network address, can't contact dhcp. I have already had the modem and ethernet cables tested, they're fine, and I have tried replacing the network card, no luck. I have also run ip config renew and replace as well as ipconfig/all everything was zero. I checked the startup menu and all the appropriate network apps are marked started and automatic.
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Jan 17, 2012
I have a cisco 850 that is not getting a WAN ip address thorugh DHCP. I have FE4 (The WAN port) set to get an ip address via DHCP, but when I do a test connection from CCP I get this error: Checking interface IP address…failed.No Ip Address for the interface has been obtained. The interface is configured to obtain an ip address through dhcp. The remote end may not be configured with a dhcp server or the dhcp pool may be empty.
Please contact your ISP or WAN administrator and check if the server has been configured to lease ip addresses to the client’s connection through DHCP. Retest connection.I know that the modem is providing an ip address via dchp, because I can plug my computer directly into the modem and get an ip address, so I think I may have missed a setting on the router. Here is he running config: [code] I think the problem may be the Firewall is not letting dhcp through (even tough I haven't set it up yet, and there are no rules in the firewall yet). But I'm not 100% sure about that.
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Oct 21, 2011
I know DHCP can assign more than just address, mask, and gateway. It can also assign a hostname, and DNS. Does anybody know if it can also be used to assign an SNMP address?
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Jul 6, 2012
I have 2 computers that cannot/will not acquire an IP address from my DLink router.There are 2 other computers that aren't having any problem at all...so I assume that it is not a problem with the DHCP service of the router. The 2 computers are laptops: one netbook running Windows XP and another standard laptop running Windows Vista Home Premium x86. Both computers are running McAfee and I have scanned with McAfee and Malwarebytes, and both are malware-free (no infections were found on either system on first scans...so it's not like I'm dealing with a system that has had infections removed). When connected to the network, they attempt to acquire an IP address, but cannot for some reason and then Automatic Private IP Addressing takes over and they come up with a 169.254.x.x address. I cannot figure out why this takes place, as I have gone through Winsock repair, uninstalled and reinstalled both network adapters (ethernet and WLAN) on both laptops and nothing seems to make a difference. I have even tried disabling APIPA by adding the "IPAutoconfigurationEnabled" DWORD value in the registry......still the same. I have manually configured the adapters with a static 192.168.0.x address, and I can begin to communicate on the local area level...but still cannot establish any kind of Internet connection.
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Mar 8, 2011
The laptop can connect to the internet using the wifi card. However, it cannot connect to the internet when using the wired connection but it can be pinged from other machines at work. The NIC does not pick up a different IP address even after releasing and renewing the IP address through cmd. I have uninstalled and reinstalled the NIC. The NIC is working because when I set a static IP address the machine can connect to the net. Using DHCP it goes back to that same IP address. I have tried a winsock repair as well with no go, as well as taking the machine off the domain and re-joining it. Is there something I can do on my end to get a different IP address through DHCP or do I have to get a Network engineer involved? This is a machine on a corporate LAN?
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