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Router DHCP server not giving IP address

amb1s1
Level 1
Level 1

‎01-31-2011 08:19 AM - edited ‎03-06-2019 03:16 PM

Hi, I have a 3911 router with a 1242 AP. The problem that I have is that when the user is trying to connect, the user get the OS Ip address 169.254.168.154 and I see that when I do the "show dot11 association" command, but when I do sh ip dhcp binding on the  router I see

172.19.9.141        0100.18de.74db.14       Jan 31 2011 11:14 AM    Automatic

The router is seeing as if the router gave the ip address to the user, but the reality the user was assigne the OS ip address 169.

I did "debug ip dhcp server events" and I got the following:

Jan 31 11:09:06.752 EST: DHCPD: Seeing if there is an internally specified pool class:
Jan 31 11:09:06.756 EST:   DHCPD: htype 1 chaddr 0100.18de.74db.14

Jan 31 11:09:06.756 EST:   DHCPD: remote id 020a00000a58218400000000
Jan 31 11:09:06.756 EST:   DHCPD: circuit id 00000000
Jan 31 11:09:22.748 EST: DHCPD: Sending notification of DISCOVER:
Jan 31 11:09:22.752 EST:   DHCPD: htype 1 chaddr 0100.18de.74db.14

Jan 31 11:09:22.752 EST:   DHCPD: remote id 020a00000a58218400000000
Jan 31 11:09:22.752 EST:   DHCPD: circuit id 00000000
Jan 31 11:09:22.752 EST: DHCPD: Seeing if there is an internally specified pool class:
Jan 31 11:09:22.752 EST:   DHCPD: htype 1 chaddr 0100.18de.74db.14

Jan 31 11:09:22.752 EST:   DHCPD: remote id 020a00000a58218400000000
Jan 31 11:09:22.752 EST:   DHCPD: circuit id 00000000
Jan 31 11:09:22.752 EST: DHCPD: Sending notification of DISCOVER:
Jan 31 11:09:22.752 EST:   DHCPD: htype 1 chaddr 0100.18de.74db.14

Jan 31 11:09:22.752 EST:   DHCPD: remote id 020a00000a58218400000000
Jan 31 11:09:22.752 EST:   DHCPD: circuit id 00000000
Jan 31 11:09:22.756 EST: DHCPD: Seeing if there is an internally specified pool class:
Jan 31 11:09:22.756 EST:   DHCPD: htype 1 chaddr 0100.18de.74db.14

Jan 31 11:09:22.756 EST:   DHCPD: remote id 020a00000a58218400000000
Jan 31 11:09:22.756 EST:   DHCPD: circuit id 00000000
Jan 31 11:10:46.710 EST: DHCPD: checking for expired leases.

the following are my config on the router:

no ip dhcp use vrf connected
ip dhcp excluded-address 172.19.9.137 172.19.9.140

!

!

ip dhcp pool DM_Access
   network 172.19.9.136 255.255.255.248
   dns-server 172.20.50.215 172.20.50.217
   default-router 172.19.9.137
   domain-name corp.gaptea.com
   lease 0 2

. Thanks

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11 Replies 11

cadet alain
VIP Alumni
VIP Alumni

‎01-31-2011 09:34 AM

Hi,

to which nic does 00.18de.74db.14  MAC correspond?

by the way your DHCP scope is really small:only 2 addresses

 network 172.19.9.136 255.255.255.248

this gives hosts from .137 to .142 included but you are excluding:

ip dhcp excluded-address 172.19.9.137 172.19.9.140

from .137 to .140 included  which leaves .141 and .142

Is it on purpose?

Regards.

Alain.

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amb1s1
Level 1
Level 1
In response to cadet alain

‎01-31-2011 10:08 AM

The NIC is from the User PC that is having problems and yes the 2 ip

is on purpose.

0 Helpful

cadet alain
VIP Alumni
VIP Alumni
In response to amb1s1

‎01-31-2011 10:21 AM

can you clear dhcp bindings then renew lease on client and post the debug ip dhcp server events + debug ip dhcp server packets.

Regards.

Alain.

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amb1s1
Level 1
Level 1
In response to cadet alain

‎02-11-2011 12:20 PM

This is the Latest Debug that I did. I see that it is showing; DHCPD: Pool DM_Access has no parent.

Feb 11 15:08:11.394 EST: %SEC-6-IPACCESSLOGP: list 167 permitted udp 172.19.9.10(67) -> 172.19.9.12(67), 10 packets
Feb 11 15:08:20.902 EST: DHCPD: Sending notification of DISCOVER:
Feb 11 15:08:20.902 EST:   DHCPD: htype 1 chaddr 0018.de14.db74
Feb 11 15:08:20.902 EST:   DHCPD: remote id 020a00000a580d8400000000
Feb 11 15:08:20.902 EST:   DHCPD: circuit id 00000000
Feb 11 15:08:20.902 EST: DHCPD: DHCPDISCOVER received from client 0100.18de.14db.74 through relay 172.19.9.10.
Feb 11 15:08:20.902 EST: DHCPD: Seeing if there is an internally specified pool class:
Feb 11 15:08:20.902 EST:   DHCPD: htype 1 chaddr 0018.de14.db74
Feb 11 15:08:20.902 EST:   DHCPD: remote id 020a00000a580d8400000000
Feb 11 15:08:20.902 EST:   DHCPD: circuit id 00000000
Feb 11 15:08:20.902 EST: DHCPD: Sending DHCPOFFER to client 0100.18de.14db.74 (172.19.9.14).
Feb 11 15:08:20.902 EST: DHCPD: child  pool: 172.19.9.8 / 255.255.255.248 (DM_Access)
Feb 11 15:08:20.902 EST: DHCPD: pool DM_Access has no parent.
Feb 11 15:08:20.902 EST: DHCPD: child  pool: 172.19.9.8 / 255.255.255.248 (DM_Access)
Feb 11 15:08:20.902 EST: DHCPD: pool DM_Access has no parent.
Feb 11 15:08:20.902 EST: DHCPD: child  pool: 172.19.9.8 / 255.255.255.248 (DM_Access)
Feb 11 15:08:20.902 EST: DHCPD: pool DM_Access has no parent.
Feb 11 15:08:20.902 EST: DHCPD: unicasting BOOTREPLY for client 0018.de14.db74 to relay 172.19.9.10.
Feb 11 15:08:20.906 EST: DHCPD: Sending notification of DISCOVER:
Feb 11 15:08:20.906 EST:   DHCPD: htype 1 chaddr 0018.de14.db74
Feb 11 15:08:20.906 EST:   DHCPD: remote id 020a00000a580d8400000000
Feb 11 15:08:20.906 EST:   DHCPD: circuit id 00000000
Feb 11 15:08:20.906 EST: DHCPD: DHCPDISCOVER received from client 0100.18de.14db.74 through relay 172.19.9.11.
Feb 11 15:08:20.906 EST: DHCPD: Seeing if there is an internally specified pool class:
Feb 11 15:08:20.906 EST:   DHCPD: htype 1 chaddr 0018.de14.db74
Feb 11 15:08:20.906 EST:   DHCPD: remote id 020a00000a580d8400000000
Feb 11 15:08:20.906 EST:   DHCPD: circuit id 00000000
Feb 11 15:08:20.906 EST: DHCPD: Sending DHCPOFFER to client 0100.18de.14db.74 (172.19.9.14).
Feb 11 15:08:20.910 EST: DHCPD: child  pool: 172.19.9.8 / 255.255.255.248 (DM_Access)
Feb 11 15:08:20.910 EST: DHCPD: pool DM_Access has no parent.
Feb 11 15:08:20.910 EST: DHCPD: child  pool: 172.19.9.8 / 255.255.255.248 (DM_Access)
Feb 11 15:08:20.910 EST: DHCPD: pool DM_Access has no parent.
Feb 11 15:08:20.910 EST: DHCPD: child  pool: 172.19.9.8 / 255.255.255.248 (DM_Access)
Feb 11 15:08:20.910 EST: DHCPD: pool DM_Access has no parent.
Feb 11 15:08:20.910 EST: DHCPD: unicasting BOOTREPLY for client 0018.de14.db74 to relay 172.19.9.11.
Feb 11 15:08:23.902 EST: DHCPD: Sending notification of DISCOVER:
Feb 11 15:08:23.902 EST:   DHCPD: htype 1 chaddr 0018.de14.db74
Feb 11 15:08:23.902 EST:   DHCPD: remote id 020a00000a580d8400000000
Feb 11 15:08:23.902 EST:   DHCPD: circuit id 00000000
Feb 11 15:08:23.902 EST: DHCPD: DHCPDISCOVER received from client 0100.18de.14db.74 through relay 172.19.9.11.
Feb 11 15:08:23.902 EST: DHCPD: Seeing if there is an internally specified pool class:
Feb 11 15:08:23.902 EST:   DHCPD: htype 1 chaddr 0018.de14.db74
Feb 11 15:08:23.902 EST:   DHCPD: remote id 020a00000a580d8400000000
Feb 11 15:08:23.902 EST:   DHCPD: circuit id 00000000
Feb 11 15:08:23.902 EST: DHCPD: Sending DHCPOFFER to client 0100.18de.14db.74 (172.19.9.14).
Feb 11 15:08:23.902 EST: DHCPD: child  pool: 172.19.9.8 / 255.255.255.248 (DM_Access)
Feb 11 15:08:23.902 EST: DHCPD: pool DM_Access has no parent.
Feb 11 15:08:23.902 EST: DHCPD: child  pool: 172.19.9.8 / 255.255.255.248 (DM_Access)
Feb 11 15:08:23.902 EST
: DHCPD: pool DM_Access has no parent.
Feb 11 15:08:23.902 EST: DHCPD: child  pool: 172.19.9.8 / 255.255.255.248 (DM_Access)
Feb 11 15:08:23.902 EST: DHCPD: pool DM_Access has no parent.
Feb 11 15:08:23.902 EST: DHCPD: unicasting BOOTREPLY for client 0018.de14.db74 to relay 172.19.9.11.
Feb 11 15:08:23.906 EST: DHCPD: Sending notification of DISCOVER:
Feb 11 15:08:23.906 EST:   DHCPD: htype 1 chaddr 0018.de14.db74
Feb 11 15:08:23.906 EST:   DHCPD: remote id 020a00000a580d8400000000
Feb 11 15:08:23.906 EST:   DHCPD: circuit id 00000000
Feb 11 15:08:23.906 EST: DHCPD: DHCPDISCOVER received from client 0100.18de.14db.74 through relay 172.19.9.10.
Feb 11 15:08:23.906 EST: DHCPD: Seeing if there is an internally specified pool class:
Feb 11 15:08:23.906 EST:   DHCPD: htype 1 chaddr 0018.de14.db74
Feb 11 15:08:23.906 EST:   DHCPD: remote id 020a00000a580d8400000000
Feb 11 15:08:23.906 EST:   DHCPD: circuit id 00000000
Feb 11 15:08:23.906 EST: DHCPD: Sending DHCPOFFER to client 0100.18de.14db.74 (172.19.9.14).
Feb 11 15:08:23.906 EST: DHCPD: child  pool: 172.19.9.8 / 255.255.255.248 (DM_Access)

0 Helpful

cadet alain
VIP Alumni
VIP Alumni
In response to amb1s1

‎02-11-2011 12:35 PM

Hi,

Your client is not on the same subnet as the DHCP server and there is a dhcp relay between and the server is  offering an IP address

corresponding to the address of the relay where the DHCP discover was sent.(there are 2 different giaddress here)

But we don't see any requests from client for the proposed IP and no ack from server.

Is your relay a Cisco gear? if so can you post sh run | s dhcp and can you debug dhcp ont it qat the same time as on server.

Regards.

Alain.

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amb1s1
Level 1
Level 1
In response to cadet alain

‎02-16-2011 06:30 AM

You see that it is in a different subnet is because we had the same problem in another branch, so the debug output it shwoing a different subnet. I would like to know what is a no parent child means, thanks

0 Helpful

cadet alain
VIP Alumni
VIP Alumni
In response to amb1s1

‎02-16-2011 07:07 AM

Hi,

After some research her is what i've found: your manual binding is your child pool and it should be a part of a normal pool: the parent pool

So eg you have a parent pool of 172.16.3.0/24 and you want to provide host A with 172.16.3.20/24 then this is your child pool.

Regards.

Alain.

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amb1s1
Level 1
Level 1
In response to cadet alain

‎02-18-2011 06:54 AM

So going by my config:

no ip dhcp use vrf connected
ip dhcp excluded-address 172.19.9.137 172.19.9.140

!

!

ip dhcp pool DM_Access
   network 172.19.9.136 255.255.255.248
   dns-server 172.20.50.215 172.20.50.217
   default-router 172.19.9.137
   domain-name corp.gaptea.com
   lease 0 2

.

How can I create a parent Pool. Thanks

0 Helpful

cadet alain
VIP Alumni
VIP Alumni
In response to amb1s1

‎02-18-2011 10:16 AM

Hi,

You don't need to create one because this is surely not the problem.

Can you post ipconfig/all then deactivate and reactivate user NIC while debugging dhcp on the relay agent if you've got one and the dhcp server:

debug ip dhcp server events and debug ip dhcp server packets

Do you have switches in between? have they got dhcp snooping enabled?

Can you do sh access-list on the server and relay before and after the NIC retries to get a lease.

Regards.

Alain.

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roncro
Level 3
Level 3
In response to cadet alain

‎04-27-2020 09:09 AM

Hello,

I know this is a really old post/thread, but I have the same problem, so thought I'd see if I could use this thread.

 

I have a few wireless access points, autonomous, and they are in subnet 192.168.37.0

 

I want clients (associations) that connect to an AP to get an IP address depending on what device it is.

let's say I want  one group of devices in 192.168.2.0, another one in 192.168.3.0 and "everything else"in 192.168.4.0.

 

with dhcp enabled on the router.

When I assign an address to a client/associatin in the same subnet as the APs are (192.168.37.0) it just works.

 

However, if I make a dhcp pool (static)  with static binding  MAC/IP,  I have the same problem:

Apr 27 15:09:36.561: DHCPD: client's VPN is .
Apr 27 15:09:36.561: DHCPD: No option 125
Apr 27 15:09:36.561: DHCPD: Sending notification of DISCOVER:
Apr 27 15:09:36.561: DHCPD: htype 1 chaddr 58ef.689e.9981
Apr 27 15:09:36.561: DHCPD: remote id 020a0000c0a8250101000025
Apr 27 15:09:36.561: DHCPD: circuit id 00000000
Apr 27 15:09:36.561: DHCPD: DHCPDISCOVER received from client 58ef.689e.9981 on interface GigabitEthernet0/1.37.
Apr 27 15:09:36.561: DHCPD: Seeing if there is an internally specified pool class:
Apr 27 15:09:36.561: DHCPD: htype 1 chaddr 58ef.689e.9981
Apr 27 15:09:36.561: DHCPD: remote id 020a0000c0a8250101000025
Apr 27 15:09:36.561: DHCPD: circuit id 00000000
Apr 27 15:09:36.561: DHCPD: there is no address pool for 192.168.37.1.
Apr 27 15:09:36.561: DHCPD: setting giaddr to 192.168.37.1.
Apr 27 15:09:36.561: DHCPD: BOOTREQUEST from 58ef.689e.9981 forwarded to 192.168.1.1.

 

The pool for DHCP to use is there, I think it just doesn't know to use it.

The APs are connected to a Cisco 2960 switch, and the ports the APs are connected to are trunks.

 

I used to have an small business router, an RVC320, where connecting an AP have it use a different subnet then the cleints connecting to it "miraculously" just worked.

 

I am trying to do the same thing an a Cisco 2900 router  with Cisco 2960 switches.

 

thanks,

 

Ron

 

0 Helpful

Akhtar Samo
Level 1
Level 1
In response to cadet alain

‎06-11-2012 05:58 AM

Hi Alain,

Just checking if it is normal to see following debug messages if there is no dhcp pool configured on the router ?

001549: Jun  7 17:24:29.330 UAE: DHCPD: Seeing if there is an internally specified pool class:

Regards,

Akhtar

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