WLC Controllers with Multiple DHCP Servers

Hello All,
I have a central office with (2) 4402 WLC's and about 25 Branch offices throughout the country. Currently all AP's are static IP'd with IP's from the local Branch office subnets. However the Clients all pull their IP's from a Central DHCP server here at corporate.
What I would like to do, is have clients get local branch office IP's from the AP located at that site. So rather than using a central DHCP server here at corporate using a single subnet for all wireles clients. Clients would be assigned local IP's by preferably local DHCP servers. I am having trouble finding an answer to this problem within the documentation. Any help or Ideas would be appreciated.

were not using any radius type authentication. But I am still a bit hazy on how the hreap thing works, I did read the link and it is very helpful but I was kind of thrown into this one without much wireless background. Right now when I change an Ap to H-reap it somehow disables the a radio. I cant seem to get that back working which im not all that sure is even that big of a deal. The SSID is configured for local switching and central auth.

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WLC 5508 and Multiple DHCP servers in different sites?

Hi
I work for health authority in our region and we just purchased a Cisco wlc 5508 controller along with 25 3500 AP's. We have multiple sites with different IP subnets in each, all connected by a frame relay (owned by ISP). Each site has its own DHCP server. I have the controller in our main site. So when I take an AP to a remote site, the Ap gets an DHCP address from local DHCP server (which is great) and contacts controller and joins controller. Everything is good. BUT, when a client joins at the remote site, it gets an address from a previous site which will not work because the client is now on a different subnet. We dont use Vlans as they dont transvers the frame relay. I need those clients to obtain DHCP from the local DHCP server from the site they are on. Is that possible??
I have updated the controller to latest version as well.
Thanks
Bryan Yaciuk, CCNA
Parkland Regional Health Authority

We call this as HREAP LOCAL SWITCHING!! but here is the catch.. everytime the AP joins the new site.. we need to configure the VLAN mapping and this wil do it for you!! Here is the link which will resolve ur issue..
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_configuration_example09186a00807cc3b8.shtml#ll
Lemme know if this answered ur question and please dont forget to rate the usefull posts!!
Regards
Surendra

WLC 4400 and multiple authentication servers e.g. RADIUS, ACS

WLC 4400 and multiple authentication servers e.g. RADIUS, ACS
Can the WCL 4400 be set up to use multiple RADIUS servers? The user accounts for accessing wireless would use a RADIUS server. The administrative accounts for the WLC would reside on an ACS server.

Yes, that is correct. You can set acs to use both radius and tacacs.
For this you need to add WLC twice in acs-->network configuration. But you need to keep host name different.
eg 1) Host name WLC --->IP x.x.x.x -->Auth using -->radius
2) Host name WLC1--->IP x.x.x.x --->Auth using -->Tacacs.
You need to set up tacacs commands on WLC along with radius commands.
Regards,
~JG
Please rate helpful posts

NetBoot and Multiple DHCP Servers

Hey everyone,
We have a NetBoot machine running here at my school (where I work). It was working like a champ until a couple of weeks ago when our network got upgraded and there are now 2 DHCP servers on our network. That, for some reason, is totally screwing up our NetBooting process.
Here's what I think is happening, and maybe someone can tell me if I right or wrong. NetBoot (or BSDP protocol) is a "broadcast" protocol. (That means it's always just floating around out there on the network. ) NetBoot (BSDP) protocol gets injected into the DHCP stream, and any machine that gets DHCP can get BSDP, and essentially NetBoot.
The problem is with BSDP. BSDP protocol wants to have all of it's "broadcasts" come from the same server. So when we had 1 DHCP server, everything was fine, because client machines would get their whole NetBoot process from one machine... all of the BSDP broadcasts were coming from our 1 DHCP server.
Now, we have 2 DHCP servers. What happens is, a client will get some of it's BSDP broadcasts from one DHCP server, and some from another... which it does not like at all.
I recently read somewhere that it is possible to somehow make one of our DHCP servers the "authoritative" server, to which all of the clients will go to get their NetBooting info.
Does this sound in any way right? Are we on the right track ? Has anyone seen this before? Any help would be greatly appreciated. Thanks a million.
Mike

Now, we have 2 DHCP servers. What happens is, a
a client will get some of it's BSDP broadcasts from
one DHCP server, and some from another... which it
does not like at all.
Not unless your new DHCP server is also a NetBoot server and is set to provide NetBoot services. BSDP and DHCP are not the same thing. If what you were saying were true, it wouldn't be possible to have DHCP and NetBoot offered by different servers.
It IS possible, however, that the two DHCP servers are causing problems by both servicing DHCP requests for the same clients. If you've got multiple DHCP servers on the same subnet (or your router's configured to pass DHCP requests between subnets), you should make sure that only one of the DHCP servers answers requests from any given client. In our world, our Novell server is the default DHCP server on our subnet, but I keep a list of excluded MAC addresses on that server so that my Macintosh clients don't get addresses from it. On the Mac OS X server, I'm careful to limit my address ranges only to those machines which have static address maps in NetInfo. That way, our servers coexist, but they don't overlap.
It's not clear from your message whether your previously solitary DHCP server was your Mac OS X server, or whether one of the two DHCP servers is that box. But whatever the servers are, it might be helpful to turn off one of them to see if the same problem occurs (assuming you can, without major network disruptions). If that's not possible, can you talk to your network admins to see if there's some way to isolate your clients and one of the servers--in other words, see if there's some way to keep DHCP servers from responding to the same requests.
There may be any number of other reasons why this problem has cropped up. You may need to dust off a hub and a copy of Ethereal or EtherPeek to sniff what's happening on the network. You might also try NetBooting in verbose mode, to see where the process craps out. IIRC, there'a decent guide for this kind of troubleshooting over at Bombich's site (www.bombich.com).
Good luck.
David Walton

How to configure one TREX host with multiple index servers ?

Hi All,
Does anyone know how to configure TREX on the one host,
with multiple index servers ?
Reason for this is to make better use of resources available on the host server(4 Gig, 4 Processor, Windows2003), to improve the search performance of
our KM content for portal users.
I am using TREX 7 and have not been able to do this,
despite reading the Single and Distributed install
documentation.
Any help would be appreciated.
Regards,
Andres

Hi Andres,
To make use of the RAM a Server provides you have to run two indexserver processes (each can then consume 2 GB);
Proceed like this:
1. Go to TREXdeamon.ini; check if section [indexserver2] is there (it is already provided, but not active in standard installation)
2. In TREXdeamon.ini go to
[daemon]
references sections below
programs=nameserver,preprocessor1,indexserver1,queueserver,alertserver
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3. To distribute existing indexes to the new process, start TREXadmintool and go to Index: Landscape
Go to the last two columns and move the indexes (move master here/secondary mouse click)
If you don't distribute the indexes the new index server process will be regarded when an new index is created.
Hope this helps!
cheers
Bettina

BSPs configuration with multiple apps servers

Hi Masters,
This is regrarding configure ICM and BSPs on our production box with multiple application servers.
We have our production box in a cluster environment.
The central instance is dbciSAP and apps servers are sapaps2 thru sapaps6. The database is on shared disks. Whenever the central instance fails sapaps2 takes the control and become as dbciSAP but the main dbciSAP never become a application server when ever sapaps2 acts as dbciSAP. Since we have configured load balancing concept in production environment the users can login to system thru any application server. This is waht our environment.
As part of our production box to SAP 4.7 upgrade from 4.6C, we are asked to configure the environment to deploy BSPs. We have successfully configured and deployed the BSPs in our DEV and QAS system (Both are central instances with no application servers) except production box which is due in the next month.
The process we follow to activate BSPs is as follows:
1.Define an ICM service port in /etc/services file.
2.Add the ICM related parameters in instance profiles.
3.Make sure the ICM status is active in SMICM tx.
4.Activate the BSP services in SICF as per OSS note 571484.
Now, the question is how to configure the same ICM service and activate the BSPs since we have multiple multiple application servers.
Subsequently What I am enquirying is:
Do I need to define ICM service ports on each and every hosts where the application servers are running?
Do I need to make changes to each and every instance profile of the application server?
What are the differences in configuring ICM services on central instance and application instances?
Appreciate any help in this regard.
Thanks and Regards
Murty Patchipala

Grasshopper,
I think what you should really read up on is the SAP WebDispatcher. If are serious about running BSP/ICM across multiple app servers, this is the key technology:
http://help.sap.com/saphelp_nw04/helpdata/en/42/5cfd3b0e59774ee10000000a114084/frameset.htm This may also answer some of your questions about profile parameters.
Other than that I can share what we did. We did activate the ICM and services on all app servers and central instance. The service ports of the individual servers aren't that important now because of the WebDispatcher (at least they aren't visible to the user).
Yes we did make some of the ICM profile changes in each instance profile. If your settings are the same, consider using the default profile. Are their particular settings you are interested? I will look over ours, but I don't remember any huge differences from APP server to Central Instance.

Session cleanup issue with multiple Application servers

Hi ,
I am facing a strange problem with multiple application servers. The java Webdynro session does not get cleaned up completely when user closes the browser ( without using logoff ). On re-login it gets handle of old session and then fails for consecutive view on other webdynpro iviews with an invalid session error. It again starts working with a refresh event.
Any ideas/suggestion if you have seen something similar before ?
Thanks and regards,
Amit.

Hi Amit
It seems that issues is not server related, but caused by your client browser. I know, for example, that IE8.0 keeps user session even if two separate browser instances opened on the same client machine. IE 7.0 and lower behave differently - they are separate user sessions per browser instance.
BR, Siarhei

Integrating BIP with multiple LDAP servers

Hi,
my question is very simple. In Admin->Security Configuration->Security Model section i've setted Security model combobox with LDAP value. Then i've filled all LDAP information field (for example:URL). All works. But in my rpd i 've multiple LDAP servers (multiple URL) and in the form i can insert information about only one LDAP server.
Is it possible configure BIP with multiple LDAP servers?
Thanks
Giancarlo
P.S. I'm using OBIEE 10g

Hi,
my question is very simple. In Admin->Security Configuration->Security Model section i've setted Security model combobox with LDAP value. Then i've filled all LDAP information field (for example:URL). All works. But in my rpd i 've multiple LDAP servers (multiple URL) and in the form i can insert information about only one LDAP server.
Is it possible configure BIP with multiple LDAP servers?
Thanks
Giancarlo
P.S. I'm using OBIEE 10g

DHCP scope setings from multiple DHCP Servers

Is there any way to check any particular option is configured in all scopes from multiple DHCp servers.
for eg:- we would like to check if any scope has option 150 is configured in multiple DHCP servers.
I guess there are lots of cmdlets available from Win2k12 DHCP servers.
Regards, Nidhin.CK

Hi, Nidhin...
I use NETSH tool for this, can redirect results to file or filter w/ FIND.
Example:
NETSH dhcpserver \\SERVERNAME dump | FIND /I "set optionvalue 150"
Hope this helps!
Marcelo Lucas Guimarães - MCP, MCTS, MCDBA, MCITP Blog: http://mlucasg.wordpress.com

SharePoint writer metadata information in a SharePoint farm with multiple WFE servers.

I am working on Microsoft Volume Shadow Copy Service (VSS) framework. I know that in a 3-Tier SharePoint environment the SharePoint writer metadata on WFE server gives all the information related to that farm.
My question is -
a) How would i get all the information related to the SharePoint farm from the SharePoint writer metadata in an environment where multiple WFE servers are configured?
b) Is it possible that in a SharePoint farm where multiple WFE servers are deployed, SP writer of only one WFE server (Master/Main server) contains all the information about the respective SP farm servers in its metadata?

Hi Aaditya,
All Writer Metadata is stored in Writer Metadata Document which is produced by writer. The backup application uses the Writer Metadata document to get information about that writer, the data it owns,
and how to restore that data. Once the writer produces it, the Writer Metadata Document is a read-only document to the backup application.
The Writer Metadata Document contains three sets of data: writer identification and classification information, writer-level specifications, and component data.
For getting Writer Metadata, you can use
IVssBackupComponents::GetWriterMetadata method.
For more information, you can refer to the articles:
http://msdn.microsoft.com/en-us/library/aa384992(v=vs.85).aspx
http://msdn.microsoft.com/en-us/library/aa384996(v=vs.85).aspx
http://blogs.technet.com/b/dpm/archive/2011/06/02/explaining-sharepoint-data-source-enumeration-with-data-protection-manager-2010.aspx
Best Regards,
Eric
Eric Tao
TechNet Community Support

Run Admin Server with multiple Managed Servers each using different userid?

We currently run separate WebLogic domain instances for each business application in a Unix environment. Each one is created using a unix userid unique to that application and which owns all the files and is used to run the process when that particular WebLogic instance is started up. We have run this way for a while.
I am considering altering our approach to the one that is recommended, i.e. in our Production environment we would run a single Admin instance with numerous managed servers. One issue I'm stuck on is the fact that in our current environment, each application has a different unix userid that owns the files making up the WebLogic domain instance and that WebLogic instance is run under that userid.
I've investigated and experimented using WebLogic 10.3 preview and WebLogic 10.0, but I haven't been able to determine what I have to do to make each managed server's files and processes belong to a different unix userid, if that is even possible.
Is there a way, using the recommended approach, where there is a single Admin instance that has multiple managed servers whose files and processes are owned by different unique, unix userids?
If not, how would you separate access to each of the Managed Servers so that the programmers who maintain them don't have access to Managed Servers that they are not responsible for?
Thanks for any help or suggestions.....

Hi:
I played with this stuff and I found that this will work, without the Location elements:
<IfModule mod_weblogic.c>
MatchExpression /app1 WebLogicHost=server1|WebLogicPort=7003
MatchExpression /app2 WebLogicHost=server2|WebLogicPort=7003
</IfModule>
Also this will work too, with no entries inside the IfModule element:
<Location /app1 >
SetHandler weblogic-handler
WebLogicHost server1
WebLogicPort 7003
</Location>
<Location /app2 >
SetHandler weblogic-handler
WebLogicHost server2
WebLogicPort 7003
</Location>

Application Server slowdown with multiple proxy servers ?

Our environment has our iAS boxes talking to iWS web servers which are front-ended with iPlanet Proxy servers (Proxy 3.53 I believe). We are seeing significant slowdown if we try and hit our web apps through the proxy as opposed to going directly to the web server (bypassing the proxy servers). One of our "proxy" guys recalls hearing that there is an issue with the app server's handling of sessions if requests from the same user come in to the web server (and by extension the app server) from multiple proxy servers with different ip's. Has any body ever encountered this or does any body know if the app server has an issue handling the same sessions whose requests come from different ip addresses (different proxies)?

The proxy work with HTTP 1.0 and the webserver with HTTP 1.1.
This difference could be the cause of your problems.
"David Fuelling" <[email protected]> escribio en el mensaje
news:[email protected]..
Our environment has our iAS boxes talking to iWS web servers which are
front-ended with iPlanet Proxy servers (Proxy 3.53 I believe). We
are seeing significant slowdown if we try and hit our web apps through
the proxy as opposed to going directly to the web server (bypassing
the proxy servers). One of our "proxy" guys recalls hearing that
there is an issue with the app server's handling of sessions if
requests from the same user come in to the web server (and by
extension the app server) from multiple proxy servers with different
ip's. Has any body ever encountered this or does any body know if the
app server has an issue handling the same sessions whose requests come
from different ip addresses (different proxies)?
Try our New Web Based Forum at http://softwareforum.sun.com
Includes Access to our Product Knowledge Base!

Broadcasting with Multiple Application Servers

Hi, If I schedule a query broadcast to fill olap cache and I have multiple production servers which App server(s) will get the cache filled? What ever server the broadcast job runs on?
If anyone can give some insight it is greatly appreciated.
Thanks,
Ken Murray

1. If the OLAP cache is set to main memory than the OLAP Cache only gets created on the server in which it is run? So if I have 4 servers with load balancing then it is possible for the next 3 people who run the query to not benefit from the initial OLAP Cache created.
--> Next 3 people will benefit only if they log in to the same server, if cache was created in app server 1 and next 3 login to app server 2, 3 and 4 they wont hit the cache from app server 1.
2. If I change it to BLOB than any of the query runs on any server would access the initial OLAP Cache Entry that was created?
--> Yes.
3. Where is this BLOB Cached created and made available from? The DB Server or on 1 of the APP Servers?
--> DB Server
http://help.sap.com/saphelp_nw04/helpdata/en/00/241da12ef84f40bb6ecd3ae73d8b58/content.htm
4. If SAP can make BLOB Cache available to all servers then why couldn't they make Main Memory Cache available to all servers?
Main memory is specfic to a server like how you have RAM for your PC, this is not accessible by other system. BLOB is Database and can be accessed by multiple systems.
Thanks.

Multiple DHCP servers Not authorized to start in domain.

Hello all,
Suddenly in our network, we started noticing that DHCP servers are getting unauthorized automatically and stop servicing to their clients.
it is happening randomly to all my locations and post restarting the service and authorize the service will solve the issue.
I dont know why this behavior and still some dhcp servers are prompting with this issue.
Upon checking the evenlog, i am able to find that the event id "1046" with the error message loggind in those machines stating that
The DHCP/BINL service on the local machine, belonging to the Windows Administrative domain CORP.DRREDDYS.COM, has determined that it is not authorized to start. It has stopped servicing clients. The following are some possible reasons for this:
This machine cannot reach its directory service enterprise and it has encountered another DHCP service on the network belonging to a directory service enterprise on which the local machine is not authorized.
Please provide your inputs on this behavior.
Regards,
Andrew

Could anybody update on this cause.

WLC 5760 with internal DHCP server, clients no get IP address

Hi all,
I have 2 Cisco 5760 WLC (active-standby) IOS-Xe 03.03.03SE with one WLAN.
sh wlan summary
Number of WLANs: 1
WLAN Profile Name SSID VLAN Status
1 Invitados_ADSL Guest 905 UP
sh vlan
VLAN Name Status Ports
1 default active Te1/0/3, Te1/0/4, Te1/0/5, Te1/0/6, Te2/0/3
Te2/0/4, Te2/0/5, Te2/0/6
100 VLAN0100 active Te1/0/1, Te2/0/1
101 Planta_1 active
905 Internet active Te1/0/2, Te2/0/2
The DHCP server is internal.
Sometimes the clients no get IP address and the DHCP pool has IP addresses available.
The workaround done by me to solve the issue is “clear ip dhcp binding *”.
Some days later the problem appears again.
I see this bug with a similar problem:
NGWC blocks DHCP traffic if wireless broadcast disabled
CSCun88928
Description
Symptom:
Some clients set the BROADCAST flag on the DHCP Discover packet. This requires the DHCP server to reply with a broadcast.
In that case and if you are not using DHCP snooping on the 5760/3850, then the controller will block the return traffic unless you enable "wireless broadcast" which enables broadcast globally (and is thus not always desirable)
Conditions:
Seen on 3.3.2 IOS-XE
Workaround:
Use DHCP snooping with the "ip dhcp snooping wireless bootp-broadcast command"
OR
Enable "wireless broadcast" globally
My DHCP configuration is:
ip dhcp relay information trust-all
ip dhcp snooping vlan 905
ip dhcp snooping
ip dhcp excluded-address 172.16.0.1 172.16.0.19
ip dhcp excluded-address 172.16.1.250 172.16.1.254
ip dhcp pool Invitados
network 172.16.0.0 255.255.254.0
default-router 172.16.0.1
dns-server 212.66.160.2 212.49.128.65
lease 0 8
I see in Cisco documentation (http://www.cisco.com/en/US/docs/wireless/technology/5760_deploy/CT5760_Centralized_Configuration_eg.html) this configuration:
DHCP Snooping and Trust Configuration on CT5760
ip dhcp snooping vlan 100, 200
ip dhcp snooping wireless bootp-broadcast enable
ip dhcp snooping
interface TenGigabitEthernet1/0/1
description Connection to Core Switch
switchport trunk allowed vlan 100, 200
switchport mode trunk
ip dhcp relay information trusted ip dhcp snooping trust
interface Vlan100
description Client Vlan
ip dhcp relay information trusted
My question is,Do I have to add the command "ip dhcp snooping wireless bootp-broadcast enable" to solve the issue?
Thanks in advance.
Regards.
D

Yes, test it with the command you mentioned
ip dhcp snooping wireless bootp-broadcast enable
HTH
Rasika
**** Pls rate all useful responses *****

WLC Controllers with Multiple DHCP Servers

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