DHCP Troubleshooting Tips

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Create Extended Access-list 120

access-list 120 permit ip host 0.0.0.0 host 255.255.255.255
access-list 120 permit udp host host eq 67
access-list 120 permit udp host host eq 68
access-list 120 permit udp host host eq 67
access-list 120 permit udp host host eq 68

 

Or (if you don’t know DHCP servers’s IP)

 

access-list 120 permit ip host 0.0.0.0 host 255.255.255.255
access-list 120 permit udp any any eq 67
access-list 120 permit udp any any eq 68

 

And apply debug commands

Router# debug ip packet details 120

or

Router# debug ip udp (It is CPU intensive, so watch out)

 

Router# debug ip dhcp server packet

 

 

Disable

Router# u all