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dhcp confliction issue ----

vinodjad1234
Level 2
Level 2

‎11-28-2011 12:36 AM - edited ‎03-07-2019 03:37 AM

My office is not able to get ip address for any client .... router output is also showing that we have confliction ....

router # 

no ip dhcp use vrf connected

ip dhcp excluded-address 161.61.*.1 161.61.*.10

!

ip dhcp pool ******

   network 161.61.*.* 255.255.255.0

   domain-name ****.com

   dns-server 161.61.*.*

   netbios-name-server 161.61.*.* 161.61.*.*

   default-router 161.61.*.*

   lease 0 1

router #show ip dhcp conflict

IP address        Detection method   Detection time          VRF

161.61.182.151    Gratuitous ARP     Nov 28 2011 03:03 PM                                                                                                    

161.61.182.152    Gratuitous ARP     Nov 28 2011 03:03 PM                                                                                                    

161.61.182.153    Gratuitous ARP     Nov 28 2011 03:03 PM                                                                                                    

161.61.182.154    Gratuitous ARP     Nov 28 2011 03:03 PM                                                                                                    

161.61.182.155    Gratuitous ARP     Nov 28 2011 03:03 PM                                                                                                    

161.61.182.156    Gratuitous ARP     Nov 28 2011 03:03 PM                                                                                                    

161.61.182.157    Gratuitous ARP     Nov 28 2011 03:04 PM                                                                                                    

161.61.182.158    Gratuitous ARP     Nov 28 2011 03:04 PM                                                                                                    

161.61.182.159    Gratuitous ARP     Nov 28 2011 03:04 PM                                                                                                    

161.61.182.160    Gratuitous ARP     Nov 28 2011 03:04 PM                                                                                                    

161.61.182.161    Gratuitous ARP     Nov 28 2011 03:04 PM
161.61.182.151    Gratuitous ARP     Nov 28 2011 03:03 PM                                                                                                    
161.61.182.152    Gratuitous ARP     Nov 28 2011 03:03 PM                                                                                                    
161.61.182.153    Gratuitous ARP     Nov 28 2011 03:03 PM                                                                                                    
161.61.182.154    Gratuitous ARP     Nov 28 2011 03:03 PM                                                                                                    
161.61.182.155    Gratuitous ARP     Nov 28 2011 03:03 PM                                                                                                    
161.61.182.156    Gratuitous ARP     Nov 28 2011 03:03 PM                                                                                                    
161.61.182.157    Gratuitous ARP     Nov 28 2011 03:04 PM                                                                                                    
161.61.182.158    Gratuitous ARP     Nov 28 2011 03:04 PM                                                                                                    
161.61.182.159    Gratuitous ARP     Nov 28 2011 03:04 PM                                                                                                    
161.61.182.160    Gratuitous ARP     Nov 28 2011 03:04 PM                                                                                                    
161.61.182.161    Gratuitous ARP     Nov 28 2011 03:04 PM 

please suggest me to troubleshoot this issue

1 person had this problem
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0 Helpful
5 Replies 5

cadet alain
VIP Alumni
VIP Alumni

‎11-28-2011 12:43 AM

Hi,

this means the router sent a GARP request for these IP before allocating them to clients and it received an ARP reply so it considers they are already in use on the network and can't lease them.

So change these static IPs on the devices and put them in manual bindings or let them as static but put them as excluded in your DHCP config then do a clear ip dhcp conflict * and an ipconfig/renew on the devices.

Regards.

Alain

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0 Helpful

Thotsaphon Lueangwattanaphong
Level 7
Level 7

‎11-28-2011 12:43 AM

Hello,

    First off , To get rid off this problem. You just issue "clear ip dhcp conflict *".

HTH,

Toshi

0 Helpful

vinodjad1234
Level 2
Level 2
In response to Thotsaphon Lueangwattanaphong

‎11-28-2011 12:54 AM

Hi ,

we have done the same. but i am getting the same output

0 Helpful

Thotsaphon Lueangwattanaphong
Level 7
Level 7
In response to vinodjad1234

‎11-28-2011 01:23 AM

Hello,

     How many users do you want to assign IP addresses via DHCP? Is there any static ip address configured for users?

Toshi

0 Helpful

Beetlejuice01
Level 1
Level 1
In response to vinodjad1234

‎11-28-2011 01:26 AM

There are some client with a fixed ip address? For example the first ip address is already in use from another pc/server?

0 Helpful
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