03-20-2013 08:52 AM - edited 03-07-2019 12:22 PM
Cisco 1811W router, IOS 15.1(4)M6, DHCP server not working on internal VLAN but configuration looks OK to me.
C1811W#sh run int vl252
!
interface Vlan252
ip address 192.168.252.252 255.255.255.0
ip nat inside
ip virtual-reassembly
!
C1811W#sh run | section dhcp pool
ip dhcp pool VLAN252
network 192.168.252.0 255.255.255.0
subnet prefix-length 24
dns-server 192.168.252.252
default-router 192.168.252.252
C1811W#sh ip dhcp pool
Pool VLAN252 :
Utilization mark (high/low) : 100 / 0
Subnet size (first/next) : 0 / 0
Total addresses : 256
Leased addresses : 0
Pending event : none
1 subnet is currently in the pool :
Current index IP address range Leased addresses
192.168.252.0 192.168.252.0 - 192.168.252.255 0
C1811W#debug ip dhcp server event
DHCP server event debugging is on.
*Mar 20 15:46:23.437: DHCPD: Sending notification of DISCOVER:
*Mar 20 15:46:23.437: DHCPD: htype 1 chaddr 0019.9d07.e0d0
*Mar 20 15:46:23.437: DHCPD: remote id 020a0000c0a8fcfc040000fc
*Mar 20 15:46:23.437: DHCPD: circuit id 00000000
*Mar 20 15:46:23.437: DHCPD: Seeing if there is an internally specified pool class:
*Mar 20 15:46:23.437: DHCPD: htype 1 chaddr 0019.9d07.e0d0
*Mar 20 15:46:23.437: DHCPD: remote id 020a0000c0a8fcfc040000fc
*Mar 20 15:46:23.437: DHCPD: circuit id 00000000
*Mar 20 15:46:23.441: DHCPD: there is no address pool for 192.168.252.252.
03-20-2013 09:10 AM
C1811W(config)#ip dhcp pool VLAN252
C1811W(dhcp-config)#no subnet prefix-length
Mar 20 16:09:00.966: DHCPD: Adding binding to radix tree (192.168.252.1)
Mar 20 16:09:00.966: DHCPD: Adding binding to hash tree
Mar 20 16:09:00.966: DHCPD: assigned IP address 192.168.252.1 to client 0100.199d.07e0.d0.
09-21-2013 01:33 PM
Thank you for posting your solution. This helped me resolve my problem. Though i'm not quite sure how/why the subnet prefix-length would cause this issue. Can anyone explain?
09-21-2013 04:52 PM
subnet prefix-lenIgth 24
I agree, this shouldn't be there.
It's an old command that once had a place but now it's irrelevant.
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