What are tools available in Instant AP to troubleshoot DHCP option related issues?

By Shyam_Moolayilkalarikkal posted Jul 08, 2014 05:35 PM


Question:  What are tools available in Instant AP to troubleshoot DHCP option related issues?
Environment: This article applies to all the IAPs running a minimum OS version of


Troubleshooting DHCP option related issues

Several Commands are provided by the Instant OS to troubleshoot  DHCP option related issues


The below debug commands only display the headers of DHCP packets exchanged between IAP and the Client.

6c:f3:7f:c2:5d:fa# debug pkt type dhcp

6c:f3:7f:c2:5d:fa# debug pkt match type

6c:f3:7f:c2:5d:fa# debug pkt dump

Received packet from eth1 (timestamp 0219088168)

[asap_firewall_forward(3740):firewall entry] len 1038, vlan 0, egress CP, ingress eth1:

  #mac: etype 0800 smac b4:b0:17:7f:75:c9 tmac ff:ff:ff:ff:ff:ff

  #ip: sip, dip, proto 17, dont fragment, last fragment,

 fragment offset 0

    #udp: sport 68 dport 67 len 1004

      #dhcp: message-type: request

             hardware type: 1, len: 6

             hops: 0

             transaction id: be078b90

             seconds elapsed: 0

             boot flags: 0x0000

             client ip:, your ip:

             next server ip:, relay agent ip:

             client mac: b4:b0:17:7f:75:c9

             server host name: (null)

             boot file name: (null)

             magic cookie: 63825363

The show clients debug on Master can display the content of wireless client . The show datapath user on the client’s associated IAP can show the Vlan information of the connected client.




These debugging commands should be executed and analyzed

From WebUI


To view the log information related to DHCP options for IAPs


1. Navigate to More>Support at the top right corner of the Instant main window. The Support window is displayed.


2. Select AP Internal DHCP Status from the Command drop-down list.


3. Select All Access Points or Instant Access Point(VC) from the Target drop-down list.


4. Click Run.






Below is the Packet Capture of DHCP ACK to troubleshoot DHCP options