DHCP Pool option question

adm-r1#sh run | sec dhcp
ip dhcp relay information option
ip dhcp bootp ignore
ip dhcp excluded-address 10.1.5.1 10.1.5.99
ip dhcp excluded-address 10.1.5.200 10.1.5.254
ip dhcp pool XXXXXXXXXXXXXXXXXXXX
network 10.1.5.0 255.255.255.0
default-router 10.1.5.1
dns-server 10.1.100.22 10.1.100.36 10.1.100.249
domain-name XXXXXXXXXXXXXXXXXXXXX
option 43 ip 10.1.5.100 10.1.5.199
option 60 ip 10.1.5.100 10.1.5.199
CUT
The customer here wanted to set an option 43 and 60 to dhcp adresses in this local pool.
What I am wondering is if the option command I have set works like the excluded addresses command does. Aka setting the option in range from .100 to .199?
I also added the ip dhcp relay information option to the config.
Other suggestions for this?
Haven't really set up many dhcp pools with option before. The customer's goal is to get autodiscovery going on their end.
My apologies if this question is posted in the wrong community, I found something with the word "LAN" and went for it.
/Erik

This may be a little late, but to help people in the future, I'm posting my working config
ip dhcp pool Solo
option 119 hex 0563.6973.636f.0363.6f6d.0002.636f.0275.6b00
This has to two domains, cisco.com and co.uk.
05 length in hex
00 null route label per RFC 1035. This goes at the end of each domain name.
63 ascii hex value of character
05636973636f03636f6d0002636f02756b00
05 C I S C O 03 C O M 0002 CO 02U K00
Yours would be configured as
option 119 0e6c6f7475732d696e7465726e616c02636f02756b0004636f7270056c6f63616c00
lotus-internal co uk corp local

Similar Messages

DHCP pools for LWAP's with multiple models

I have 2 different AP models (1130's & 1140's) for which I want to create a DHCP pool on a core layer 3 switch with an Option 43 pointing to the Wireless LAN Controller. In conjunction with the Option 43 entry however, I need to specify the AP type as an ASCII string in the Option 60 parameter. Problem is, how can this be done for multiple ASCII strings; ie. multiple AP models? The DHCP pool option 60 entry only allows for one string and you can only enter one option 60 command per DHCP pool. Surely it is common to have more than one AP model and that this can be done without having to resort to multiple DHCP pools (one for every model)?
Can anyone shed some light on this for me please? Would be much apprciated as I've come up blank on CCO documentation!

I usually just stage the AP first to join a WLC and to make sure it works prior to installing it. Pllace it on the same submnet as the management and let it join and then set the primary, secondary and or tertiary. Then you can move it to any vlan you want. If you want to use DHCP Option or DNS, then you should know that if for example it is an RCVK IOS previous to capwap it will only do LWAPP. Once it joins to the WLC in LWAPP it takes a new IOS the unit will do CAPWAP.
As an example 1140 have an RCVK IOS that only run CAPWAP, so it should only do CAPWAP:
CISCO-LWAPP-CONTROLLER and CISCO-CAPWAP-CONTROLLER
Create two A records both pointing to the same controller if you want to use DNS.
DHCP Option 43:
DHCP Option 43 is limited to one access point type per DHCP pool. You must configure a separate DHCP pool for each access point type.
http://www.cisco.com/en/US/docs/wireless/access_point/1140/quick/guide/ap1140getstart.html#wp37440

DHCP Pool - DNS Search list - Option 119

Hello Experts
I've configured a DHCP Pool for a customer who wants the router to also give out a couple of dns suffixes to the clients.
This is what I've done. Can you please advise how i can get it to work ?
ip dhcp pool LAN
   import all
   network 10.106.0.0 255.255.0.0
   default-router 10.106.20.10
   dns-server 10.101.10.14 10.102.10.14
   option 119 ascii "lotus-internal.co.uk,corp.local"
many thanks
aravind

This may be a little late, but to help people in the future, I'm posting my working config
ip dhcp pool Solo
   option 119 hex 0563.6973.636f.0363.6f6d.0002.636f.0275.6b00
This has to two domains, cisco.com and co.uk.
05 length in hex
00 null route label per RFC 1035. This goes at the end of each domain name.
63 ascii hex value of character
05636973636f03636f6d0002636f02756b00
05 C I S C O 03 C O M 0002 CO 02U K00
Yours would be configured as
option 119 0e6c6f7475732d696e7465726e616c02636f02756b0004636f7270056c6f63616c00
                         lotus-internal       co    uk            corp                 local

DNS in DHCP Pool (Internal DNS issue)

I know that we can setup multiple DNS server under DHCP pool. But I like to make sure the order.
I have multiple branch offices.
Let us say that Branch 1 office has a router with 10.30.1.1 as default gateway.
Our internal DNS is 10.0.0.1 and 10.0.0.2 as Pri and Sec.
My order of DNS server is like below.
1. gateway
2. internal DNS
3. public DNS provided by ISP
I saw couple of issues that when I put internal DNS first. Particular situation is when IPsec is not working, users could not access internet through domain name because they had internal DNS which is not reachable.
But, when gateway is first order, I am not sure whether user are able to access internal website because gateway DNS doesn't have internal DNS records.
So, my question is that. what should be the best order for DNS setup under DHCP among default gateway, internal DNS and public DNS? Our current setup doesn't have even gateway address, it only has internal DNS addresses only.
ip dhcp pool ccp-pool1
network 10.30.1.0 255.255.255.0
domain-name test.org
default-router 10.30.1.1
netbios-name-server 10.30.1.1
dns-server 10.30.1.1 10.0.0.1 10.0.0.2 24.25.5.60

Thank you, Richard.
You are right. when I setup router IP for DNS server in DHCP pool. it did not work.
Let me ask regarding external DNS forwarding.
I like to know the process of exteranl DNS.
User --> Internal website --> OK with internal DNS
User --> External website --> Internal DNS forwarding to External DNS
We have our own external DNS (ns), in this case, if external DNS (ns) is down, every branch users are not able to resolve any external IP because internal DNS can't get reply from external DNS?
2nd question)
IPsec is split-tunneled, but in this case, every DNS request goes internal DNS which is located in HQ and goes back through IPsec? Usually Split tunnel doesn't go internet traffic through IPsec but internet directly.
3rd Question)
what is for ip name-server x.x.x.x when I setup ip name-server 8.8.8.8 and I tried to ping 8.8.8.8 from router, it didn't work. Am i missing something?
https://supportforums.cisco.com/thread/230711
Thanks for your time and knowledge.

Convert to Question Pool random questions?

We are updating a course we developed last year (prior to
Captivate 3). This year we want to apply Captivate 3's "Question
Pool random questions" to this course. Is there a way to create the
question pool(s) in this existing quiz, and then add last year's
questions to them without having to re-enter each question into the
Question Pool Manager?
Thank you for any tips!

Hi Jan
Sure thing. Just convert the version 1 or 2 project to a
version 3 project. Then define a Question Pool. Once you have done
that, switch to Storyboard view. Select the question slides you
wish to add to the pool and right-click. You should be presented
with an option to add the selected slides to the pool.
Once you have moved the question slides to a pool, you would
then insert Random slides that point to the pool.
Cheers... Rick

DHCP pool to large. I want to shrink it.

Hi. So I have a DHCP Pool from say x.x.x.1 to x.x.x.200 buti want to reduce it to allow more static IP addresses at the top end so I want for example to change it to x.x.x.1 to x.x.x.170 to do this do I need to make a not of all the settings and delete the pool entirely and recreate the new pool, or is there which I would prefer to do, some way to shrink the pool, without blowing it away.
I'm paranoid and hate the idea of deleting it and creating a new pool, just in case. :)
Thanks

Along with Anders comments...
I'm not sure, but with NetWare one could adjust begin and end ranges for the DHCP pool... no? (Can't check). That option was gone with Linux (eDir integrated) DHCP services, but can still be done "under water".
If it's just the range and no real subnet changes... you can also edit the range using iManager or ConsoleOne (by looking at the values of the subnet pool in the "other" tab). Then reload the service. You should give the PC's some time (depending on lease time and how ofter PC's get rebooted) to get an assignment that's inside the new set range before handing out the addresses for static assignment.
As added note:
The export/import will work just as well, but a word of warning: with the Linux DHCP version you can lose certain info like class definitions and other little stuff. So it's always good to make note of the settings before doing that.
Cheers,
Willem

If the switch itself is hosting the DHCP pool, can the switch still be configured to send a copy of the request to ISE?

ip dhcp pool POOL52
network 10.10.52.0 255.255.255.0
domain-name didata.ise
dns-server 10.10.50.11 10.10.50.1
default-router 10.10.52.1
option 43 ascii 10.10.50.100
lease 7
Interface Vlan52
description EmployeeVLAN-52
ip address 10.10.52.1 255.255.255.0
ip helper-address 10.10.50.10
In this case above, 10.10.50.10 is the ISE server...

Yes you can do that. just add secondary DHCP as "ip helper-address "ISE IP Address" ".

Microsoft DHCP Server - Option 43 Setup

I have the scope configured properly as far as the 241 Option with Option 43 and the VCI in it for both the 1130 and 1200 series AP's. However, how do you make this work if your subnet has both 1200 and 1130's in it? Basically if I have two 241 options set, the 1130 comes in first allowing hte 1130's to associate, but not the 1200's. If I remove the 1130 Option 241, the 1200's associate. Basically, how do I get both to work from the scope correctly?
Thanks,
Raun

Hi Raun,
Here is some additional info;
This section contains a DHCP Option 43 configuration example on a Windows 2003 Enterprise DHCP server for use with lightweight access points. For other DHCP server implementations, consult the DHCP server documentation for configuring DHCP Option 43. In Option 43, you should use the IP address of the controller management interface.
****Note DHCP Option 43 is limited to one access point type per DHCP pool. You must configure a separate DHCP pool for each access point type.****
From this doc;
http://www.cisco.com/en/US/docs/wireless/access_point/1200/installation/guide/120h_g.html
DHCP OPTION 43 for Lightweight Cisco Aironet Access Points Configuration Example
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_configuration_example09186a00808714fe.shtml#t1
Hope this helps!
Rob

DNS not resolving to new machines on network after increasing DHCP pool size

Hello,
I am having a very strange issue with connecting new machines to reach the internet.
We have a ASA 5505 which the previous tech configured the DHCP pool to 192.168.1.60 - 192.168.1.110
We ended up reaching our limit which I changed it to: 192.168.1.60 - 192.168.187
Then next day when I arrived to work, our DC was hung from windows updates. Once we got everything back up, every computer currently on the network can reach the internet/VPN tunnels etc. So (continuing with my day) I created a new server in a VM (Hyper-V)
I can ping everything internally (even the router) 192.168.1.1, but I cannot resolve DNS. I have configured a static IP, tried Dynamic IP.
I have looked for any ACL indicating to block outside the range of the old DHCP pool but no luck.
On my local maching I can ping the DNS addresses, but just not on the new server.
Can anyone point me in the right direction to where to look for this issue?

I ended up figuring out what the issue was.
Since it was in a Hyper-V VM. the hosting server had to be updated to SP1.
Once completed, and rebooted. The VM in question got an IP address.

VOIP and dhcp pool

We just upgraded the CallManager and new voips. I have noticed that we are running out of ip's. We setup a second pool, but are unable to register any phones on the new/different vlan (453). What am I missing?
      The config on NTP/DHCP server is as follows:
      Ip dhcp smart-relay
      No ip dhcp use vrf connected
      Ip dhcp excluded-address xxx.xx.253.129 xxx.xx.253.135
      Ip dhcp excluded-address xxx.xx.253.248 xxx.xx.253.254
      Ip dhcp excluded-address xxx.xx.253.65 xxx.xx.253.69 (new to config)
      Ip dhcp pool VOIP
      Network xxx.xx.253.128 xxx.xxx.xxx.128
      Next-server xxx.xx.253.131
      Default-router xxx.xx.253.130
      Option 150 ip xxx.xx.253.131
      Ip dhcp pool VOIP2 (new to config)
      Network xxx.xx.253.64 xxx.xxx.xxx.192 (new to config)
      Next-server xxx.xx.253.131 (new to config)
      Default-router xxx.xx.253.65 (new to config)
      Option 150 ip xxx.xx.253.131 (new to config)

sh ip dhcp bind on dhcp server x.x.253.132
Bindings from all pools not associated with VRF:
ips listed, mac address, lease times; all today the 19th or tomorrow the 20th, type; all automatic
x.x.253.136
.138
.140
.142
.143
.144
.146
.148
.149
.151-.157
.159-.166
.168-.188
.190
.193
.194
.196
.198
.199
.202-.204
.208
.213
.214-.216
.218
.219
.221-.231
.244
.249
.250
.251
.252

SG500X DHCP setup - option 242

Good day
I'm trying to configure DHCP option 242 on a "Cisco" SG500x switch for Avaya phones that will be connecting to the switch
I have learnt (the hard way) that the SG500X "IOS" is different to what we are used to ...
Option 242 works perfectly on a Cisco 887VAG, but I can't get it configured on this switch
At this stage I don't have access to the Graphical Interface, switch is at a remote site, and only connection is console.
So here is what I have
interface vlan 1
ip address 10.1.1.1 255.255.255.0
no ip address dhcp
ip dhcp server
ip dhcp excluded-address 10.1.1.1 10.1.1.10
ip dhcp pool network DATA
address low 10.1.1.1 high 10.1.1.254 255.255.255.0
lease 0 8
domain-name testing.com
default-router 10.1.1.1
dns-server 8.8.8.8 8.8.4.4
*** here is the part I just cant get to work ***
option 242 ascii "MCIPADD=10.1.1.7,MCPORT=1719,HTTPSRVR=10.1.1.8,FTPSRVR=10.1.1.9,L2Q=1,L2QVLAN=12"
or
option 242 ascii MCIPADD=10.1.1.7,MCPORT=1719,HTTPSRVR=10.1.1.8,FTPSRVR=10.1.1.9,L2Q=1,L2QVLAN=12
I get the following error message :
switchcfc28f(config-dhcp)#$SRVR=10.1.1.8,FTPSRVR=10.1.1.9,L2Q=1,L2QVLAN=12"
Not supported option.
switchcfc28f(config-dhcp)#$RVR=10.1.1.8,FTPSRVR=10.1.1.9,L2Q=1,L2QVLAN=12
Not supported option.
Help and advice will be GREATLY appreciated
Regards
Neil

WouterC wrote:
How can we change our config to include both servers so we don't have to modify it when one server is down?The easiest way is to specify both server addresses in the AltAuth option:
option NewT.AltAuth 192.168.92.197, 192.168.92.198;
Another approach would be to move away from specifying server addresses in DHCP and do it by using DNS instead. Apparently this approach hasn't made it into the official SRSS docs yet but you can read about it in the ThinkThin blog at http://blogs.sun.com/ThinkThin/entry/sun_ray_provisioning .
OttoM.
Working for Oracle, but not speaking for Oracle.

DHCP pool on 3550

I am setting up a training network and wanted to know if i can set up the 3550 as a dhcp server. Do i just add the ip dhcp pool? And do i need to give one of the ports a static IP so that the other switches on the network can also pool addresses from the switch? Thank for any help.

3550 is a L3 switch. You can define SVI interfaces for each vlan you want to route. You can define DHCP pools for each vlan (subnet)
int vlan 1
ip add 172.16.1.1 255.255.255.0
int vlan 2
ip add 172.16.2.1 255.255.255.0
ip dhcp pool VLAN1
network 172.16.1.0 /24
default-router 172.16.1.1
dns <>
lease <>
wins <>
option
ip dhcp pool VLAN2
network 172.16.2.0 /24
default-router 172.16.2.1
dns <>
lease <>
wins <>
option
On other switches (if supported) you can set the management vlan (VLAN1) as follows
int vlan 1
ip address dhcp (not all switches will support this option)
Create trunks between other switches and the 3550 and trunk the required vlans between them.
Also use VTP if required, to propagate vlans into the rest of the network rather than trying to create the same vlan in the database of each switch.3550 can be the VTP server, all others can be VTP client.

DHCP configuration options

Can anyone tell me how to change the DHCP configuration options - the same information found in dhclient.conf in linux/unix - under OSX? A corporate client of mine provides wireless internet at all their facilities, but no one with a Mac has ever been able to connect. The wireless connection comes up and is stable, but the Mac never receives an IP address. I am fairly certain they forward DHCP requests to a centralized server that handles multiple LAN segments. I suspect something in the format of the DHCP packet, perhaps one of the many options, is causing their router to drop the Mac's DHCP request packet. I have captured DHCP requests from OSX and Win2K using Ethereal, so I have some idea what options to try changing, but I need to know how to go about it. I've tried adding a dhclient.conf file, but OSX seems to ignore this.
Needless to say, this is not a simple question and I realize I'll be fiddling at low levels. However, I've tried everything there is to try with the control panel, command lines, etc. I generally have no problems getting WiFi to work across Mac and windoze whether at home, in hotel rooms, or at corporate locations, but this one really has me stumped. Any help is appreciated.

How are you connecting to the wireless network? Is it a closed network with security, or an open network? There are a lot of different protocols in play with a wireless connection, particularly with Cisco equipment. It's possible Macs don't support one of the protocols where Windows does. There may be extra security such as DHCP client IDs, or using DHCP reservations only. There could be MAC address security setup on the wireless APs.
I would ask one of your PC buddies help you find an unused address. Set that manually and see if everything works. If it does you know you have a DHCP problem. If it doesn't there's a problem with the wireless connection

Dual dhcp pools fa 1

why wont my ip phone get the right ip address? is this even going to work like this? i have a 1811 and on fa1 i have a switch set up. i would like to set up an ip phone and have the wifi on my lap top to get a specific ip. im just trying to get the ip phone to work right now and still cant it keeps taking a 192 address
ip dhcp pool 1
import all
network 192.168.1.0 255.255.255.0
dns-server 208.67.222.220 65.32.5.111 65.32.5.74
default-router 192.168.1.1
domain-name BrownTown
lease 31
ip dhcp pool IP-Phone
host 199.11.28.19 255.255.255.248
client-identifier 8875.5650.bb76
default-router 199.11.28.17
dns-server 144.230.31.245 144.230.31.117 144.230.30.245
option 150 ip 10.246.190.205 10.246.182.205
domain-name dhcp.sprint
interface FastEthernet1
description $ETH-LAN$
ip address 199.11.28.17 255.255.255.248 secondary
ip address 192.168.1.1 255.255.255.0
ip access-group in_out out
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat inside
ip virtual-reassembly max-reassemblies 1000
load-interval 30
duplex auto
speed auto
this pops up in my arp
# sho arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 192.168.1.12 2 8875.5650.bb76 ARPA FastEthernet1
edit update i got it work needed to switch my ip's on the interface
interface FastEthernet1
description LAN$$$$
ip address 192.168.1.1 255.255.255.0 secondary
ip address 199.11.28.17 255.255.255.248
ip access-group in_out out
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat inside
ip virtual-reassembly max-reassemblies 1000
load-interval 30
duplex auto
speed auto
then set up my pools
ip dhcp pool 1
import all
network 192.168.1.0 255.255.255.0
dns-server 208.67.222.220 65.32.5.111 65.32.5.74
default-router 192.168.1.1
domain-name BrownTown
lease 31
ip dhcp pool IP-Phone
host 199.11.28.19 255.255.255.248
client-identifier 0188.7556.50bb.76
default-router 199.11.28.17
dns-server 144.230.31.245 144.230.31.117 144.230.30.245
option 150 ip 10.246.190.205 10.246.182.205
domain-name dhcp.
ip dhcp pool -Laptop
host 199.11.28.20 255.255.255.248
client-identifier 01e8.e0b7.cdf3.66
default-router 199.11.28.17
dns-server 144.230.31.245 144.230.31.117 144.230.30.245
domain-name dhcp.
ip dhcp pool Laptop-wifi
host 199.11.28.18 255.255.255.248
client-identifier 01c4.8508.ac82.4e
default-router 199.11.28.17
dns-server 144.230.31.245 144.230.31.117 144.230.30.245
domain-name dhcp.

no its not liking that
BrownTown(dhcp-config)#Hardware address ?
<0-255> ARP hardware type from "Assigned Numbers" RFC
ethernet 10Mb Ethernet
ieee802 IEEE 802 networks
<cr>
i did get this in
ip dhcp pool IP-Phone
host 199.11.28.19 255.255.255.248
hardware-address 8875.5650.bb76
default-router 199.11.28.17
dns-server 144.230.31.245 144.230.31.117 144.230.30.245
option 150 ip 10.246.190.205 10.246.182.205
domain-name dhcp.sprint
edit
still the same
5424490: *Jul 2 18:13:41.185 PCTime: DHCPD: DHCPREQUEST received from client 0188.7556.50bb.76.
5424491: *Jul 2 18:13:41.185 PCTime: DHCPD: Appending default domain from pool
5424492: *Jul 2 18:13:41.185 PCTime: DHCPD: Using hostname 'SEP88755650BB76.BrownTown.' for dynamic update (from hostname option)
5424493: *Jul 2 18:13:41.185 PCTime: DHCPD: Sending DHCPACK to client 0188.7556.50bb.76 (192.168.1.12).
5424494: *Jul 2 18:13:41.185 PCTime: DHCPD: broadcasting BOOTREPLY to client 8875.5650.bb76.
edit edit
tryed removeing my ip pool 1
5424506: *Jul 2 18:16:05.037 PCTime: DHCPD: DHCPINFORM received from client 0100.1a4d.5734.75 (192.168.1.129).
5424507: *Jul 2 18:16:05.037 PCTime: DHCPD: Finding a relay for client 0100.1a4d.5734.75 on interface FastEthernet1.
5424508: *Jul 2 18:16:08.037 PCTime: DHCPD: DHCPINFORM received from client 0100.1a4d.5734.75 (192.168.1.129).
5424509: *Jul 2 18:16:08.037 PCTime: DHCPD: Finding a relay for client 0100.1a4d.5734.75 on interface FastEthernet1.
5424510: *Jul 2 18:16:22.709 PCTime: DHCPD: DHCPREQUEST received from client 0188.7556.50bb.76.
5424511: *Jul 2 18:16:22.709 PCTime: DHCPD: Finding a relay for client 0188.7556.50bb.76 on interface FastEthernet1.
5424512: *Jul 2 18:16:31.885 PCTime: DHCPD: DHCPREQUEST received from client 0188.7556.50bb.76.

Ipad DHCP Server Options

Hello
we are currently evaluating the ipad, but we have started to have issues when we altered our DHCP server Options (Needed as we are also evaluating XenDesktop 4)
Option 66 -XenDesktop
option 67 - XenDesktop
option 43 - Mitel VoIP
since these changes all ipads struggle to get an IP address , it can take up to 15 minuets to connect, My Ipad witch has a static IP connects fine.
is anybody having any issues like this ?

steven_cuthill wrote:
Hello
we are currently evaluating the ipad, but we have started to have issues when we altered our DHCP server Options (Needed as we are also evaluating XenDesktop 4)
Option 66 -XenDesktop
option 67 - XenDesktop
option 43 - Mitel VoIP
since these changes all ipads struggle to get an IP address , it can take up to 15 minuets to connect, My Ipad witch has a static IP connects fine.
is anybody having any issues like this ?
You probably should address this question directly to Apple as you are not likely to get any answer here. This could be a bug in how DHCP options are handled.
United Kingdom (44) 0844 209 0611 www.apple.com/uk/support/

DHCP Pool option question

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