04-04-2006 11:24 PM - edited 03-03-2019 02:39 AM
Is the Cisco IOS DHCP server capable to handle DHCPDiscover/Requests not as broadcasts but as unicast packets? Is this a configuration issue? Why this question? We test in a Wireless environment the AIRESPACE solution with IOS DHCP server on routers. We found out, that the AIRESPACE controller needs to act as an relay agent (otherwise he doesn't forward these packets). The result is that the DHCPDiscover is correctly converted to an unicast and sent to the IOS DHCP server, but this guy ignores these packets. Note: We need to have the IOS DHCP server running on routers in this environment.
Any ideas? Thanks in advance.
Raffael
04-04-2006 11:39 PM
Yes, Cisco IOS DHCP server can handle the DHCP unicast packets.
Do you have any option in AIRESPACE controller to add the DHCP address.If you have that option make sure that DHCP server IP is there and its enabled.
-amit singh
04-05-2006 12:29 AM
Hi Amit
I'm not really sure if I understand you correctly. Let me explain the following things: The DHCP server address is already added (to activate the dhcp relay function) on the Airespace controller. But the existing configuration on the IOS dhcp server, which is laying on the router doesn't work for this. Can you explain to me, if possible which parameters are to be added/changed in the configuration? Thanks a lot. -Raffael
04-05-2006 12:37 AM
Please paste the route configuration.
-amit singh
04-06-2006 12:37 AM
Hi Amit
Thereby the dhcp part of a router:
ip dhcp pool ACME
network 10.21.190.128 255.255.255.128
domain-name pwlan-acme.com
dns-server 10.192.20.10 10.192.20.11
default-router 10.21.190.129
lease 0 0 15
update arp
accounting DHCP
! *** end ***
Can you tell me which of the config possibilities will solve my problem?:
acme-xyz(dhcp-config)#?
DHCP pool configuration commands:
accounting Send Accounting Start/Stop messages
bootfile Boot file name
class Specify a DHCP class
client-identifier Client identifier
client-name Client name
default-router Default routers
dns-server DNS servers
domain-name Domain name
exit Exit from DHCP pool configuration mode
hardware-address Client hardware address
host Client IP address and mask
import Programatically importing DHCP option parameters
lease Address lease time
netbios-name-server NetBIOS (WINS) name servers
netbios-node-type NetBIOS node type
network Network number and mask
next-server Next server in boot process
no Negate a command or set its defaults
option Raw DHCP options
origin Configure the origin of the pool
subnet Subnet allocation commands
update Dynamic updates
utilization Configure various utilization parameters
vrf Associate this pool with a VRF
acme-xyz(dhcp-config)#
Thank you
-Raffael
04-11-2006 04:17 AM
Hi
It's a long time since I've read/heard about this. So, is it possible to get some input concerning this topic? I'd appreciate to get any updates. Thanks in advance
-Raffael
04-11-2006 05:01 AM
Hi Raffael,
Do you know for sure if the DHCP server is receiving the DHCP discover frames and whether a DHCP offer is sent?
Try running a debug to verify:
debug ip dhcp server events
debug ip dhcp server packets
This should be safe to run as long as your DHCP clients aren't in the range of thousands or more.
It may be helpful to have a test PC to release/renew so that you can watch for information for that specific machine.
HTH,
Bobby
*Please rate helpful posts.
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: