3000 series and Multiple DHCP scopes (DHCP-relay)

I need to send different DHCP options to users; however, I need to put certain groups in different subnets. Is it possible to setup the concentrator to relay for addresses from different scopes?

- Configuration
- System
- IP Routing
- DHCP Relay
a. Enable 'Enabled' checkbox
b. Select Forward to
c. Address == 192.168.10.8 255.255.255.0
- Address Management
- Assignment
a. Enable 'Use DHCP'
- User Management
- Groups
- Select 'groupA'
- Modify Group
- Click General tab
- Enter 'DHCP Network Scope' x.x.x.x
- Select 'groupA'
- Remove Address Pool
Now I get the following error:
118 02/08/2005 13:29:00.720 SEV=3 DHCPDBG/39 RPT=34
DHCP discover timeout: no response from polled servers (xid 3821297335)
I can ping the server, and it is serving up this scope to other devices (just not from the concentrator)

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PlotSeries (One serie and multiple itemRenderer)

Hi all,
I'm working in charts, concretely with a PlotChart.
Its code:
<mx:PlotChart id="plot" width="100%" height="100%"
                dataProvider="{chartList.arrRouting}"
                showDataTips="true">
              <mx:horizontalAxis>
                   
                   <mx:DateTimeAxis alignLabelsToUnits="true" dataInterval="2"
                        dataUnits="hours" parseFunction="myParseFunction"/>
              </mx:horizontalAxis>
               <mx:verticalAxis>
               <mx:CategoryAxis dataProvider="{chartList.arrcoll2}"/>
               </mx:verticalAxis>
               <mx:series>
                    <mx:PlotSeries id="pSeries" xField="time" yField="node"
                         fillFunction="myFillFunction"/>
               </mx:series>
</mx:PlotChart>
DataProvider is an array like this: [event:'NodeConnected', time:'23:53', node:'A']
                                                 [event:'NodeDisconnected', time:'02:53', node:'A']
                                                 [event:'RemoveRouteTo', time:'01:53', node:'B'];
                                                 [event:'NewRouteTo', time:'23:53', node:'C']............................
And I use a fill function:
          private function myFillFunction(element:ChartItem, index:Number):IFill{
               var c:SolidColor = new SolidColor(0x00CC00);
               var item:PlotSeriesItem = PlotSeriesItem(element);
               if (item.item.event == 'NewRouteTo'){
                    c.color =0x01DFD7;
                    return c;
               if (item.item.event == 'RemoveRoute'){
                    c.color = 0xF7FE2E;
                    return c;
               if (item.item.event == 'NodeConnected'){
                    return c;
               }else {
            c.color = 0xFF0000;
               return c;
Then, I want to change the itemRenderer (icon) acorrding to param Event. As I have only one serie all items are with a circle (default Item Renderer),
I try to put in myFillFunction the next code: pSeries.setStyle("itemRenderer", new ClassFactory(mx.charts.rendereres.CrossItemRenderer)); but doesnt work.
Is it possible to do that?
Thanks in advance,

Hi,
if you set itemRenderer for series, all items will be rendered using this class.
If you want to have different pictures for items in one series you should create your own itemRenderer and change the symbol accoding data.
For example,
public class MyCoolItemRenderer extends ProgrammaticSkin implements IDataRenderer
... // do something
override protected function updateDisplayList(unscaledWidth:Number,
unscaledHeight:Number):void
super.updateDisplayList(unscaledWidth, unscaledHeight);
var stroke:Stroke = getStyle("stroke");
var g:Graphics = graphics;
g.clear();
g.lineStyle(stroke.weight, stroke.color, stroke.alpha);
switch (data.event)
     case "NewRouteTo":
          g.drawCicle(0, 0, unscaledWidth); // just an example. You can show the way of rendering items in SDK source
          break;
g.endFill();

Multiple DHCP scopes on WLC 5508 (not showing leases?)

I have 2 DHCP scopes set up on a wlc 5508, one for the AP's and another for a wlan, the leases for the AP's scope show up, but the one that the clients on the WLAN are on do not show up in the "show leases" is that a bug? normal?

Customers using Cisco Unified Wireless solutions have been reporting issues with the DHCP support provided on the Wireless LAN Controller (WLC). Some of these issues are software bugs or debugability problems. Others are due to lack of proper understanding on the DHCP implementation.
This document describes the different DHCP operations on the wireless controller, which provides consistent and accurate information to customers in an effort to reduce the related customer issues and TAC cases.
Please refer to the following link: http://www.cisco.com/c/en/us/support/docs/wireless/4400-series-wireless-lan-controllers/110865-dhcp-wlc.html

Ip source guard feature and dhcp DHCP scope exhaustion (client spoofs other clients)

Hi everybody.
A dhcp server assigns ip adress based on mac address carried by client hardware field in dhcp packets.
One potential attack is when a rogue host mimics different mac addresses and causes dhcp server to assign the ip addresses until no ip address is left for legitimate host.
For e.g a host h1 with mac1 has assigned ip address by dhcp server as:
199.199.199.1 mac1
Dhcp server has the above entry in its database.
Using hacking tools such as Yersinia or Gobbler one can create a dhcp discover messages each time creating a different mac for client hardware field in dhcp server thereby causing a dhcp server to assign ip addresses because to dhcp server , these are legitimate dhcp discover messages with each carrying a different mac in client hardware addresses.
You might say use dhcp snooping and it will prevent that ( dhcp scope exhaustion) and configure the switch to check if src mac matches the client hardware address in dhcp message. But still we can creat spoofed discover messages where src mac in ethernet header will match the client hardware address in dhcp discover message. We still did not overcome the problem.
You might say use IP source guard feature but will it really prevent that problem from happening?
Let me illustrate it :
h1---------f1/1SW---------DHCP server
Let say we have configured dhcp snooping on sw1 and f1/1 is untrusted port. The switch has following dhcp binding
199.199.199.1    mac1   vlan1 f1/1
Next we configure ip source guard to validate both src mac and src ip against the dhcp bindings . When we configures ip source guard first , it will allow dhcp communication only so a host can request ip address and a dhcp binding can be built. After that ip source guard will validate src ip or src mac or both against the dhcp binding.depending upon how we configure ip source guard.
In our case we have configured ip source guard to validate both src mac and src ip against the dhcp binding.
A dhcp binding is already created as:
199.199.199.1 mac1 vlan 1 f1/1
Now using the hacking tools Yersinia or Gobbler on h1, we create our first spoofed dhcp discover message where src mac=mac2 in ethernet header and client harware address= mac2 in dhcp discover message. Since switch is configured with ip source guard feature and therefore allows dhcp discover message to pass through. Dhcp server upon receiving the dhcp message assigns another ip address from the pool. Now the dhcp server has following entries:
199.199.199.1 mac1
199.199.199.2 mac2.
We can continue to craft spoofed dhcp discover messages as mentioned above and have dhcp server keep assigning ip addresses until the whole pool is exhausted.
So my question is how does ip source guard in conjuction with dhcp snooping prevent this particular attack from happening? ( i.e DHCP scope exhaustion)
I really appreciate your input.
thanks and have a great week.

Thanks Karthikeyan.
First of all, we gather all the information about the locations of legitimate dhcp servers in our network. Once we have this information, we will configure the ports used to reach them as trusted. All the ports where end users will connect will be untrusted and therefore subject to dhcp snooping .
it means if any of user connected in that switch/vlan runs a dhcp services like vmware for eg. Snooping will prevent the dhcp/bootp servers connected to that port will not be able to process.
Yes that is correct. Because dhcp snooping feature will check these ports for the messages usually sent by dhcp server such as dhcp offer, etc. If the end user is running dhcp server using virtual machine, that port should be configured as trusted if it is dertermined that end user is running a legitimate dhcp server using vm ware.
When we have the dhcp snooping it prevents the 1st level of hacking itself. I don't think so it will have any impact on dhcp address releasing.
I am sorry. You lost me here. What is 1 level of hacking?
Dhcp snooping checks for dhcp messages such as dhcp release, dhcp decline.on untrusted port against the dhcp bindings.
Here is why;
h1---------SW1-------dhcp server
               |
             h2
Let say we don't have dhcp snooping in above attack and h2 is a legitimate user has already assigned ip address 199.199.199.2 by dhcp server. Thus the dhcp server has an entry:
199.199.199.2 mac2
Next we connect rogue user and it gets ip address 199.199.199.1 now the dhcp server has entries:
199.199.199. 1 mac1
199.199.199.2   mac2
Now using hacking tools, h1 create a fake dhcp release message with 199.199.199.199.2   mac2
Dhcp server upon receiving this message, will release the ip address and returns it to the pool.
By using DHCP snooping, switch will peer inside dhcp release message and checks against the binding. If there is conflict, it will drop the message.
IFor e.g
If have dhcp snooping configured , then switch will have adhcp binding as:
199.199.199.1    mac1    vlan 1   f1/1 lease time
199.199.199.2     mac2    vlan 2    f1/2 lease time.
If h1 tries to send fake dhcp release with ip address 199.199.199.2    mac2
Switch will check ip address 199.199.199.2 and mac2 against the binding related to f1/1 . Sw will find a conflict and therefore drops the dhcp release packet.
Thanks

Multiple Lease Duration for one DHCP Scope?

Hi All,
I have an urgent question. I wanted to know if it is possible to have many lease durations for different computer groups getting their addresses from one DHCP scope. I saw somewhere that it is possible to use User Classs or Vendor Classes for setting a lease
duration for a group of computers sharing the same class Id ?
If it is true, How can to configure ?
Also i would like to know about the lease duration period what is the maximum days can we have ( 8 days After )?
Thanks
Atul

Please refer to the following-
http://social.technet.microsoft.com/Forums/windowsserver/en-US/26de79f9-6ad7-4088-9077-006b9dd8c1fb/multiple-lease-durations-for-one-dhcp-scope?forum=winserveripamdhcpdns
You can configure any value as lease duration; however if you want a very big/infinite value; it makes sense to convert the lease(s) to a reservation.

Client Authentication/Authorization via ISE & AD, Posture Registry Key, and mapped to specific DHCP scope by AD membership

Hi Team,
I'm currently working on a configuration entailing WLC and ISE where the customer wants a single SSID,and wants his wireless clients to authenticate successfully if they pass a registry key compliance. Additionally, they want clients to received a different IP address or get mapped to a different DHCP scope based on the Microsoft AD group they belong too. for example:
Client authenticating with registry key and in AD group ABC that passes authentication gets IP address or subnet for AD group ABC.
Client authenticating with registry key and in AD group XXX that passes authentication gets IP address or subnet for AD group XXX.
Clients---->WLC------>ISE-----> MS AD ( groups ABC, XXXX, YYY )
currently using EAP-PEAP/MSCHAPv2
Does anyone have any idea or pointers or can refer me somewhere that I can read on how to accomplish this? Not sure on how to do the registry compliance check nor what attributes will allow me to map the client to a DHCP Scope based on this AD group membership?
Thanks...

Do check cisco how to guides you will get step by step configuration of the current requirement

Getting "Error in setting DHCP Scope Network and Netmask"

Hello Cisco Experts - I'm trying to setup a new DHCP scope on my Cisco 2504 and am getting the error referenced above. Here are the settings I am using:
I have another range setup in exactly the same way only it runs from 10.35.209.65 through 10.35.209.90. Can anyone point me in the right direction for what I'm doing wrong? Thanks in advance!

Good question.
Here is the screeshot of the scope I just activated:
What IOS Version are you running? I have 7.4.100.0 on mine.
Please Rate Helpful posts and mark this question as answered if, in fact, this does answer your question. Otherwise, feel free to post follow-up questions.
Charles Moreton

DHCP scope increase and changes in wlc

hi,
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 ?
regards
rajat

Hi Rajat,
Use a /23 range ip address rather than using 172.26.150.x/24. So at first this change need to be carried out on the L3 device (which will the default gateway of the WLC managment interface). Accordingly the AP managment ip and ap manager ip's subnet mask is going to change from /24 to /23.
Then ensure that on the dhcp server you expand the scope from /24 to /23. This is will not affect the MAC bindings as long as you are using the same ip range with a different subnet mask.
Hope that helps
Regards
Najaf
Please rate when applicable or helpful !!!

DHCP scope to a specific group active directory

Hello,
I need your help.
I need to know if there is a way to
associate a specific DHCP scope to a specific
User Group ActiveDirectory.
Example. Scope1: 192.168.1.0/24
for Group-Police, Scope2:
192.168.2.0/24 for Group Financial etc etc
any way?

Thank you for your reply.
I'm sorry I have not said that I need
for a VPN infrastructure.
When clients connect to vpn
must receive an address associated a scope
according to the type of work they.
The infrastructure is behind
a DMZ and the DHCP
scope and will be provided via
DHCP RELAY but, how do I
say to a particular group of users which
addresses DHCP scope should
receive?

Create DHCP Scopes for VLANs

Hi
I have a Server 2008 R2 DHCP server with one scope for our 10.165.x.x range. We are going to introduce some VLANs on a 172.16.x.x range and want to create a DHCP scope for this on the same DHCP server as the 10.165.x.x range. If I create the scope now before
configuring the VLANs, will computers in the 10.165 range get a 172.16 address?
Thanks in advance
Shane

Hi
I have a Server 2008 R2 DHCP server with one scope for our 10.165.x.x range. We are going to introduce some VLANs on a 172.16.x.x range and want to create a DHCP scope for this on the same DHCP server as the 10.165.x.x range. If I create the scope now before
configuring the VLANs, will computers in the 10.165 range get a 172.16 address?
Thanks in advance
Shane
If you create a scope that has a different subnet than the interface on the DHCP server that's connected to the network, then no, it will not affect the current clients on the subnet.
To make it work for your VLAN, in the switch, you must create a DHCP Relay Agent or IP Helper. That's what makes it work to the VLAN subnet. To create the Relay Agent/IP Helper, consult your switch documentation.
Ace Fekay
MVP, MCT, MCSE 2012, MCITP EA & MCTS Windows 2008/R2, Exchange 2013, 2010 EA & 2007, MCSE & MCSA 2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer
Microsoft MVP - Directory Services
Complete List of Technical Blogs: http://www.delawarecountycomputerconsulting.com/technicalblogs.php
This posting is provided AS-IS with no warranties or guarantees and confers no rights.

ASA Migration of DHCP Scope to a Server

Hello All,
We migrated the DHCP scope from the ASA to a MS DHCP server with this configuration:
group-policy BV-SSL1 internal
group-policy BV-SSL1 attributes
no address-pools value remotepool4 remotepool2 remotepool3
no intercept-dhcp enable
dhcp-network-scope 10.180.49.0
exit
tunnel-group BVVPN10 general-attributes
no address-pool remotepool2
no address-pool remotepool3
no address-pool remotepool4
dhcp-server 10.182.14.55
exit
tunnel-group BV-SSL general-attributes
no address-pool remotepool2
no address-pool remotepool3
no address-pool remotepool4
dhcp-server 10.182.14.55
exit
no vpn-addr-assign aaa
no vpn-addr-assign local
vpn-addr-assign dhcp
This is running good, until we used all 254 addresses that was specified in the dhcp-network-scope.
My question is should i have specified dhcp-network-scope none to allow for all 3 scopes can be used to hand out IP addresses for the remote users?
Thanks,
Kimberly

Okay, that's at least a good start. Can you monitor the ULS logs while you attempt to browse to the site to see what form of error(s) you're getting?
Trevor Seward
Follow or contact me at...
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This post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

Windows 2008 R2 DHCP scope change - Netsh Exec not working

OK, there seems to be a disconnect between Netsh documentation and how it actually works. We are in the process of re-addressing ALL our DHCP scopes (joys of a buy-out) and using the steps outlined in numerous MS articles and Blogs etc... we should
be able to use "Netsh dhcp server scope 192.168.1.0 dump > scope1.cfg" then modify the cfg file with the new scope address (i.e. change all 192.168.1. to lets say 10.10.5.). Then use netsh exec scope1.cfg (yes, the file modified) to
create the new scope which would contain all the "stuff" the current scope has (reservations, options, etc).
Well, all we get is the response "The following command was not found: |".
Environment is as follows:
Account is a domain admin
working on a RDP session on the DHCP server
Server is Windows 2008 R2 (current functioning DHCP server)
Using administrative CMD (elevated)
have tried changing context into Netsh | DHCP | Server and default CMD - all "no go"
supporting link from MS: http://technet.microsoft.com/en-us/library/cc772372(v=ws.10).aspx#BKMK_1
There's a lot of discussions around this, but I haven't seen any response that says how to actually do it. export/import won't work for us since we have to update the scope info. With almost 100 scopes to update, we really need this functionality!
(or similar method)
Any assistance would be greatly appreciated.

OK... It seems the issue is with the dump file. I actually got exec to run once with a dump file which wasn't modified.  The stupid part is it only ran one time, I could not duplicate it.   Since
I've beat this thing to death and no one could offer any assistance (Hello MS?), I'm not wasting any more time on it.   Luckily, I was able to figure out an alternate method.
Looking at the dump file I realized all the lines are just a straight NetSh commands, which means all I needed to do is grab the lines and preface them with NetSh. Like this...
for /f "tokens=*" %a in ('type scope.cfg ^| find /i "dhcp"') do NetSh %a
where scope.cfg is your dump file.   This runs perfect and seems to be the exact thing that exec should be doing. I did flip the "SET STATE 1" to "0" so the scope was deactivated (Don't forget to run it in an elevated
prompt).
Hope this helps someone else so they aren't spending days for nothing!

Internal DHCP scope for AP on WLC 7.0 (on diff subnet)

hi All,
I would like to know if it is possible to assign dhcp pool on a different subnet to the WLC management interface?
Eg: Management Interface is on 172.16.4.100 /24
I would like to use the WLC Internal DHCP to assign IP to my APs on the a different range 172.16.2.x /24
Is that possible?
I have tried assigning dhcp scope for the AP within the same subnet as the management interface and it works. But that is not my requirement
Apparently i need my AP to be sitting on a different vlan
please advise

No its not possible.. this works only if the AP and the WLC management interface is in the same subnet!! to ur issue we use something called as DHCP OPTION 43, google search DHCP OPTION 43 + cisco, the first link that u get wil help you!!
Please dont forget to rate the usefull posts!!
Regards
Surendra

Best place to create the DHCP scope for Guest SSID for remote office connected to HQ Foreign-Anchor controller

Hi Experts ,
Need help with the respect to understand the best practice to place/create the DHCP scope for remote site Guest SSID which will be connected to HQ Foeign-Anchor controller set-up.
how about internet traffic for Guest SSID , which one will be recommanded :
1) Guest SSID gets authenticated from HQ ISE and exposed to the local internet
2) Guest SSID gets authenticated from HQ ISE and exposed to the HQ internet
Thanks

Hi George ,
Thanks for your reply ...So you mean, best design would be to create the DHCP scope into DMZ for guest and let it get exposed to HQ internet ...
how about if I have another anchor controller in lets say in other office and I need to anchor the traffic or load balance from HQ foreign controller , in that case if I create DHCP scope into HQ anchor controller and if its down , I will loose the connectivity , how do I achieve fail-over to another anchor ?
Do I need to create secondary scope into another anchor controller and let the client get reauthenticated from other location ISE and get ip address as well from another anchor controller . Is it what you are proposing ?

IPAM does not show all the dhcp scopes

Hello,
I have the following strange behavior.
I've installed IPAM on a new server (2012 R2), all the acces rules are completed. But when i'm looking to the DHCP scope, not all off the scopes are included.
For the moment its not possible to upload screenshots, but only 3 off the 4 scopes are included in IPAM.
Has anyone an idee what the problem can be?
Thank you in advance!
Regards,
Kevin

Hi,
Check the selections you have made for viewing first. To see IPv4 scopes, click DHCP Scopes in the upper navigation pane and IPv4 in the lower navigation pane. To see IPv6 scopes click IPv6 in the lower nav pane, etc.
You can also view scopes by clicking DNS and DHCP Servers and choosing Server Type = DHCP and View = Scope Properties. Again, you must click IPv4 or IPv6 in the lower nav pane. You can't view IPv4 and IPv6 scopes at the same time.
Also check and see if the scopes are shown in IP Address Blocks when you choose the Current View = IP Address Ranges.
If a scope was recently created on a DHCP server, or the server was recently added, then all data might not yet be gathered. Right-click the server in SERVER INVENTORY and then click Retrieve All Server Data, and be sure to refresh the view using the display
pane refresh button or F5.
Let me know if this helps.
Thanks,
-Greg

3000 series and Multiple DHCP scopes (DHCP-relay)

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