DHCP Server Address Range

Hi there,
I was wondering if there was a way to change the built-in DHCP server address range from 192.168.1.x to, say, 192.168.0.x? For example, when you change the router IP from 192.168.1.1 to 192.168.0.1. I noticed that when you commit such a change, the DHCP range does not update accordingly. Any ideas?
Thank you,
Paul
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Your DHCP server range should update automatically to the 192.168.0.x subnet when you change your "Local IP address" to 192.168.0.1. Be sure to use a computer that is wired to your router when you do this. Also, be sure to click on "Save Settings", then wait (3 to 60 seconds) for the screen to refresh. You will likely be disconnected from the router when you do this. Do not worry about this. Power down the router and your computer.
Next, wait 30 seconds, then reboot router and computer. Your Local IP address and the DHCP server range should now have the same subnet.

Similar Messages

Windows 2008 DHCP Server Address Range and Exclusion Range

Hi ,
I have a couple of Doubts regarding DHCp windows 2008 server
1) The DHCP server is given a static Ip in a network series eg(192.168.1.x) starting Ip is 192.168.1.1 to 192.168.1.254 ,
and if the range is from 192.168.1.10 to 1.250 ,
Should the DHCP server be not given an Ip in the DHCP range specified ?
ie the DHCP server static IP should not be in the 192.168.1.10-192.168.1.250 , ( I have given as 192.168.20.5)
Even though the Exclusion range can be specified , Just want to know if this is best practice.
2) And next setting up the range , should we give the entire network address as range ( eg 192.168.1.1 to 192.168.1.254) and set exclusion range
or take a particular series (eg 192.168.10-100)
Please advise
Thanks in Advance
Regards
Anand M

Your DHCP server range should update automatically to the 192.168.0.x subnet when you change your "Local IP address" to 192.168.0.1. Be sure to use a computer that is wired to your router when you do this. Also, be sure to click on "Save Settings", then wait (3 to 60 seconds) for the screen to refresh. You will likely be disconnected from the router when you do this. Do not worry about this. Power down the router and your computer.
Next, wait 30 seconds, then reboot router and computer. Your Local IP address and the DHCP server range should now have the same subnet.

DHCP exclude address range option config on Instant 2.0

Q: DHCP exclude address range option config on Instant 2.0
A: This article applies to Instant 4.2 and above.
Before 4.2, Use exclude-address as a range option was not available.
Since IAP is getting used as an Edge device, the features needs to be in compliance with industry standard.
From 4.2 onwards, IAP local DHCP server will support exclude IP address as a range.
With this feature we are supporting the following
A. exclude-address ip1
B. exclude-address ip1 ip2
Show dhcps command will show the excluded range and available range

I found this on TCPIPGUIDE.com that supports my findings.
"One difference between BOOTP and DHCP is that certain communications from the client to the server are unicast. The most noticeable instance of this is when a client tries to renew its lease with a specific DHCP server. Since it sends this request unicast, it can go to a DHCP server on a different network using conventional IP routing, and the relay agent does not need to be involved."

Incorrect DHCP server address to wireless client

Guys,
I have deployed a centralized wireless architecture with 2 x wisms in each of our DCs. I just noticed the clients are receiving incorrect DHCP server address, please note there is no issue with connectivity, i just want to know why incorrect DHCP server address is handed out to the clients.
The DHCP server address received is apparently virtual interface address of the WiSM. i am running WiSM firmware 7.0.116.0
Any information is appreciated.
Cheers
AP

DHCP proxy is pretty usless in my mind. It was something that lingered from the old airespace days. In fact if you ask many cisco se's they will tell you they wished they didnt default to proxy. Also, if you ever use cisco ISE, you will need to disable proxy, becuase you will need to configure a helper pointing to the ISE box for DHCP finger printing.
Steve points out, if you use the WLC as a DHCP server it is a requirement to have it on. But we all agree here on CSC (Steve, Leo, Blake, myslef), that the DHCP server on a WLC is not robust and is problematic at times.

DHCP Server - Different Range for Wired and Wireless Network

We have DHCP setup on Windows Server 2012r2 and the range given to us by the main HQ is 10.65.112.1-10.65.112.254 (there are several exclusions under this range)
Now since the range gets exhausted quickly, they provided another one 10.65.122.1-10.65.122.254.
What our branch would love to do is to dedicate the first range for Wired Computers and the other range for Wireless Devices (Phone,Tablets, Mobiles)
Right now we have 2 different scopes setup in DHCP, the second one is disabled. In our network we have 6 access points and also have a CISCO SG300-52 Managed Switch. It has an inbuilt DHCP Server and also has the function for DHCP Relay. But we are not actually using any of its functionality as of now.
So my question is how to have 2 separate ranges for wired and wireless network. People have mentioned vlans but I have no clue on how to get that done.
Is there a simpler way avoding V-LANS or if not, would love to get step by step procedure on how to go about this. Any help will be much appreciated
Regards,
Sheldon

Hi Sheldon, please read this post
https://supportforums.cisco.com/thread/2270049
You will need some modifications though. Steps 1-6 is very relevant. On step 6, you need to pay particular close attention to the "default router". If the SX300 handles your intervlan routing then the default router needs to be the IP of your VLAN. If you have a different device to handle VLAN routing then the default router needs to be that IP address.
-Tom
Please mark answered for helpful posts
http://blogs.cisco.com/smallbusiness/

DHCP assign address range to AD computer groups - possible?

Not by OU, no. DHCP doesn't interrogate AD.

Hello
Does anyone know if it's possible to get the Windows DHCP server to assign an address range to a group of computers in Active Directory? Is it possible?
This topic first appeared in the Spiceworks Community

Finding DHCP server address

Hi I've just bought a managed switch on ebay and trying to find its IP address. I can see in network settings it's giving me an IP via DHCP but trying in terminal with 'ipconfig getpacket en0' doesn't return anything. Does anyone have any suggestions? Cheers

This is fundamentally a Netgear-specific question, and not something that particularly involves OS X.
169.254.0.0/16 is in the self-assigned IP address range. You're not getting an address from the switch, which implies that the DHCP server isn't working right, that you're not on a vLAN where the DHCP server is working, or the DHCP server is disabled. Given that device is a managed switch, it's anybody's guess how the ports and vLANs and the DHCP server are configured.
If you've not already done so, get the manual for the switch and read through that; that'll give you some idea of the interface and capabilities and norms for the device.
Some of the few discussions on the hardware reset process are here, here and here in the Netgear forums, and particularly a blog post here, and it looks like there are registration-required Netgear forums for this series switch that might have additional discussions.
Based on those Netgear forum discussions, there are some bricked switches around, too.

5508 WLC + 3702I APs /w a Windows 2012 DHCP Server

All,
I am in the process of a new WLC install with five 3702I APs. The configuration was gone well up till now..... I am having issues with DHCP pulling IPs from the correct scope. The WLC is in a different VLAN (10) than the APs (142). What am I missing in the configuration? We have multiple autonomous 1252s that pull the correct scope. Any suggestions would be greatly appreciated.
Dave

Are you having issues with client getting IP when they connect to 3702 ? or AP itself not taking IP ?
Either case I would check switch SVI is configured with "ip helper-address x.x.x.x" pointing to your DHCP server.
Also for dynamic interface configuration of WLC I would check all interfaces correctly configured with DHCP server address.
You can run " debug client <mac_address>" on WLC CLI for a single client & post that output if you still facing the issue
HTH
Rasika
**** Pls rate all useful responses ****

DHCP server + IP multipath

hi,
I have configured a solaris 10 box that runs a dhcp server with ha networking using multipathing:
ifconfig dmfe0 thehostname netmask + broadcast + group mygroup -failover deprecated up
ifconfig dmfe0 addif hahostname + broadcast + failover up
ifconfig dmfe1 otherhostname netmask + broadcast + group mygroup -failover deprecated up
The networking if working fine, and setting the failover period to 2500 in /etc/default/mpathd works great - unplug cable from dmfe0 and the host is still available
before using hahostname as a virtual interface, it was bound to dmfe0, and running dhcp was all fine. Now that the IP is on the virtual interface, the DHCP server address that clients see is the IP of "thehostname" (from /etc/hosts). 1st question: is it possible to get the DHCP server to show its IP address as the IP of HAHOSTNAME instead of THEHOSTNAME? I have added "INTERFACES=dmfe0,dmfe1" to /etc/inet/dhcpsrv.conf, not able to bind to virtual interfaces, would like to if possible
In addition to that, since implementing this networking config, dhcp is not running as well. The clients on the network all received dhcp addresses with no problems prior to the HA configuration changes, after changing to this config and restarting (either restarting the dhcp-server service with svcadm or even after a server reboot), some clients are not getting IP addresses. The clients are Windows XP clients, and I had to disable my network card and re-enable it to get it to get an IP address. I get the following error in event viewer (event ID 1001):
"The semaphore timeout period has expired. . Your computer will continue to try and obtain an address on its own from the network address (DHCP) server."
after getting an IP, i can renew my IP and there are no problems, but in the event of the primary nic failing (tested by unplugging network cable), i cannot get DHCP addresses again.
the first thing that jumps to mind is it might be an arp issue - should i be binding the same mac address to all cards perhaps? i have set local-mac-address?=true with eeprom.
ideas?

You may want to ask this under Firewall section of this forum.
Regards,
Sawan Gupta

Catalyst 2950 / ip dhcp-server

Hello,
who can explain the use of ip dhcp-server on Catalyst 2950?
cat2950-03(config)#ip dhcp-server ?
Hostname or A.B.C.D IP address or Name of DHCP server
The "Catalyst 2950 and 2955 Cisco IOS Commands":
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/12122ea2/2950cr/2950cr.pdf
does not list that command.
Is it the same as "ip helper-address xxx.xxx.xxx.xxx" without forwarding the other protocols like dns, netbios, and so in or does it configure the ios dhcp-server ( that should not be included on cat2950 - as far as I know)
Greetings from Germany
Sven

Looks like it configures a remote DHCP server.
cat2950-03(config)#ip dhcp-server ?
Hostname or A.B.C.D IP address or Name of DHCP server
So, say you have a DHCP server address of 10.34.1.1, the command would be
cat2950-03(config)#ip dhcp-server 10.34.1.1
That way the hosts on the switch will now where to send the requests for an IP address. Kinda like a Gateway address.
Just my thoughts, Please rate if this helps
Scott

WinXP SP3 not getting IP from Win2012 DHCP Server

Hi,
I have a Windows 2012 DHCP server, and as clients we have mixed OS ie, XP & Win7
in Win7 we get proper IP from DHCP but in XP , in DHCP Server Address lease it shows as leased but in xp side they are not getting IP . after 20-40 minutes they are getting that IP
Anyone have any solutions for this behavior ?
Best Regards,
Shaijith KB

Hi there,
Last time when I have this problem is because one end user plug in his own appliance with a active DHCP service and somehow it affects the XP clients (only).
We found this via these 2 packet monitor tools:
Microsoft Network Monitor
WireShark, previously also known as Ethereal
Basically it is to identify the network activity at packet level on the select interface on what exactly going on for the DHCP handshaking.
Try installing one of them on the client and observe. I am personally more familiar with WireShark though.
Thanks.
-- wsn

DHCP client fails to get an valid IP address from DHCP server. windows 8.1

I have a win 8.1 Pro 64 bit pc in my office .I'm trying to connect it to my wireless cisco router with either wireless or hardwired connection but I get an error in the event viewer with discription DHCP error 1007. and Ip address showing
169.254.93.17 but our dhcp range is 192.168.1.x
Log Name: Microsoft-Windows-Dhcp-
Source: Microsoft-Windows-Dhcp-Client
Date: 23/Jun/2014 12:03:21 PM
Event ID: 1001
Task Category: Address Configuration State Event
Level: Error
Keywords: (1)
User: LOCAL SERVICE
Computer: sanddeplap.vts.com
Description:
Your computer was not assigned an address from the network (by the DHCP Server) for the Network Card with network address 0xF4B7E22D8721. The following error occurred: 0x79. Your computer will continue to try and obtain an address on its
own from the network address (DHCP) server.
Event Xml:
<Event xmlns="http://schemas.">
<System>
<Provider Name="Microsoft-Windows-Dhcp-
<EventID>1001</EventID>
<Version>0</Version>
<Level>2</Level>
<Task>3</Task>
<Opcode>75</Opcode>
<Keywords>0x4000000000000001</
<TimeCreated SystemTime="2014-06-23T08:03:
<EventRecordID>363</
<Correlation />
<Execution ProcessID="988" ThreadID="7932" />
<Channel>Microsoft-Windows-
<Computer>sanddeplap.vts.com</
<Security UserID="S-1-5-19" />
</System>
<EventData>
<Data Name="HWLength">6</Data>
<Data Name="HWAddress">F4B7E22D8721<
<Data Name="StatusCode">121</Data>
</EventData>
</Event>
I tried to track issue with microsoft network monitor I'm attaching the capture file also please help me to sort out this issue
capture report https://onedrive.live.com/redir?resid=AFE3D0245A92F6F8%21183

The issue is that your machine is not being assigned an IP address / was unable to reach the DHCP server to receive one. The 169.254.x.x IP your machine is showing isn't assigned from DHCP, it's assigned by the local machine and is referred to as an APIPA
address.
So something is preventing your machine from reaching your DHCP server, which could one of a number of things. In the first instance I'd suggest having a look at
http://epan36.blogspot.co.uk/2012/09/eventid-1001-dhcp-your-computer-was-not.html which lists several of things that could cause this error and things you can try in order to resolve it.
If none of those work, can you confirm whether you have any other machines connecting via the same method on the network, which might indicate whether this is an issue at the machine end or somewhere between the machine and DHCP server?

IP address not refreshing with new DHCP Server setup

Hi all,
This is a strange issue that I am lost. I had a different Gateway with a Built in DHCP server on 192.168.0.1 IP address. I installed a new DHCP Server with an IP address 192.168.1.1, but when I connect to the Wireless network with the correct password, I still get an IP address in the old IP range.
I have done a security wipe with the same result.
Does anyone have any ideas on what I need to do to flush out all the IP information?

Yes,
That is what I ended up doing, altho it seems very weird. I figured out how to correct it, but still am not sure why it happend.
1. Changed my DHCP Serer IP to 192.168.0.1
2. Went into the Client list and deleted the IP for the Playbook.
3. Changed the DHCP Server IP back to 192.168.1.1
4. Playbook has new IP.
Anyone with ideas why this happened I would be interested in their thoughts!!!

AirPort Express DHCP Server for distribution of IP-addresses?

Does the AirPort Express have an DHCP server that distribute local IP-addresses like other Wi-FI router does? If so, how do I set it up in the AirPort Utillity?

+Seems I cant force it to only use a specific subset of the IP address range?+
That would be up to the Netcomm router to provide the IP addresses to be used. I'm not familiar with Netcom, but a router with the type of capability I was thinking of could be configured to provide a certain range of IP addresses to a given device based on the MAC address of the device.
The additional information that you just furnished indicates that you probably have a basic featured router designed for home network use that would not have this type of capability. In that case, the AirPort Express would not be able to be configured to Distribute a Range of IP Addresses. It would have to be configured as a "bridge" on the network and receive IP addresses from the main router.
Or, the AirPort Express might be able to distribute the IP addresses that you want if you configure it to Share a public IP address. The rub here is that you will have what is known as a Double NAT on your network. You'll have two devices handling DHCP on the network when there should only really be one. It may or may not function correctly as this is not a recommended configuration.
Message was edited by: Bob Timmons

Out of available IP addresses on one DHCP server, will other DHCP servers field the request?

I have three WinServer 2012 R2 domain controllers that also act as DNS and DHCP servers.
I have a guest wireless network that has its own subnect, 10.121.176.0/20
We have our DHCP scopes split this way across the three domain controllers with a DHCP lease time of 1 day
Domain controller 1, 10.121.176.11 - 10.121.181.255 for a total of 1,525 addresses
Domain controller 2, 10.121.182.0 - 10.121.186.255 for a total of 1,280 addresses
Domain controller 3, 10.121.187.0 - 10.121.191.254 for a total of 1,279 addresses
This gives us a total of 4,084 addresses to hand out on our guest wireless network which is plenty. I just looked at each servers stats and this is what I see
Domain controller 1 - 717 addresses in use, 808 available
Domain controller 2 - 900 addresses in use, 380 available
Domain controller 3 - 1280 address in use, 0 available
On domain controller 3 I am seeing lots of DHCP events
Event ID 1063 - There are no IP addresses available for lease in the scope or superscope "GuestWireless-176
Event ID 20287 - DHCP client request from 28E14CE87EFB was dropped since the applicable IP address ranges in scope/superscope GuestWireless-176 are out of available IP addresses
Two questions:
Once Domain Controller 3 rejects the DHCP request since it is out of addresses, will this request be fulfilled by one of my other two domain controllers?
Is there any way to even out the leases on these DHCP servers? Not sure the mechanism behind a client choosing one DHCP server over another

1 yes, the dhcp server who's scope is full will not do a dhcp
'offer'
2 dhcp that answers fastest with a 'offer' will win. A delay is configurable (but changes nothing
about the root scenario were the fastest will win)
Note that if the scopes overlap on the servers, they might not lease out all the addresses in the scope.
I would enlarge the scope as you will want to fence against unavailability of one of the servers (or a network connection for that matter). you currently have more addresses leased out than any set of two of your servers can offer.
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