DHCP Problems on new SSID

marioderosa2008 · ‎12-15-2014

Hi all,

I have an SSID where clients cannot get DHCP addresses. I have captured the following debug and from what I can see the WLC recieves the DHCP address from the DHCP server and then attempts to forward that to the Station but the station does not get it.

Is my thinking correct? If so, what can cause the client not to recieve the DHCP offer packet from the WLC?

Thanks

Mario

*DHCP Socket Task: Dec 15 15:57:33.034: ac:7b:a1:10:21:74 DHCP selected relay 1 - 192.168.254.254 (local address 192.168.254.253, gateway 192.168.254.254, VLAN 51, port 1)
*DHCP Socket Task: Dec 15 15:57:33.034: ac:7b:a1:10:21:74 DHCP transmitting DHCP DISCOVER (1)
*DHCP Socket Task: Dec 15 15:57:33.034: ac:7b:a1:10:21:74 DHCP op: BOOTREQUEST, htype: Ethernet, hlen: 6, hops: 1
*DHCP Socket Task: Dec 15 15:57:33.034: ac:7b:a1:10:21:74 DHCP xid: 0xc7944f1b (3348385563), secs: 0, flags: 0
*DHCP Socket Task: Dec 15 15:57:33.034: ac:7b:a1:10:21:74 DHCP chaddr: ac:7b:a1:10:21:74
*DHCP Socket Task: Dec 15 15:57:33.034: ac:7b:a1:10:21:74 DHCP ciaddr: 0.0.0.0, yiaddr: 0.0.0.0
*DHCP Socket Task: Dec 15 15:57:33.034: ac:7b:a1:10:21:74 DHCP siaddr: 0.0.0.0, giaddr: 192.168.254.253
*DHCP Socket Task: Dec 15 15:57:33.034: ac:7b:a1:10:21:74 DHCP sending REQUEST to 192.168.254.254 (len 350, port 1, vlan 51)
*DHCP Socket Task: Dec 15 15:57:33.034: ac:7b:a1:10:21:74 DHCP selecting relay 2 - control block settings:
dhcpServer: 0.0.0.0, dhcpNetmask: 0.0.0.0,
dhcpGateway: 0.0.0.0, dhcpRelay: 192.168.254.253 VLAN: 51
*DHCP Socket Task: Dec 15 15:57:33.034: ac:7b:a1:10:21:74 DHCP selected relay 2 - NONE
*DHCP Socket Task: Dec 15 15:57:35.042: ac:7b:a1:10:21:74 DHCP received op BOOTREPLY (2) (len 295,vlan 51, port 1, encap 0xec00)
*DHCP Socket Task: Dec 15 15:57:35.042: ac:7b:a1:10:21:74 DHCP setting server from OFFER (server 192.168.254.254, yiaddr 192.168.254.184)
*DHCP Socket Task: Dec 15 15:57:35.042: ac:7b:a1:10:21:74 DHCP sending REPLY to STA (len 414, port 1, vlan 0)
*DHCP Socket Task: Dec 15 15:57:35.042: ac:7b:a1:10:21:74 DHCP transmitting DHCP OFFER (2)
*DHCP Socket Task: Dec 15 15:57:35.042: ac:7b:a1:10:21:74 DHCP op: BOOTREPLY, htype: Ethernet, hlen: 6, hops: 0
*DHCP Socket Task: Dec 15 15:57:35.042: ac:7b:a1:10:21:74 DHCP xid: 0xc7944f1b (3348385563), secs: 0, flags: 0
*DHCP Socket Task: Dec 15 15:57:35.042: ac:7b:a1:10:21:74 DHCP chaddr: ac:7b:a1:10:21:74
*DHCP Socket Task: Dec 15 15:57:35.042: ac:7b:a1:10:21:74 DHCP ciaddr: 0.0.0.0, yiaddr: 192.168.254.184
*DHCP Socket Task: Dec 15 15:57:35.042: ac:7b:a1:10:21:74 DHCP siaddr: 0.0.0.0, giaddr: 0.0.0.0
*DHCP Socket Task: Dec 15 15:57:35.042: ac:7b:a1:10:21:74 DHCP server id: 192.0.2.1 rcvd server id: 192.168.254.254
*DHCP Socket Task: Dec 15 15:57:35.045: ac:7b:a1:10:21:74 DHCP received op BOOTREQUEST (1) (len 329,vlan 0, port 1, encap 0xec03)
*DHCP Socket Task: Dec 15 15:57:35.045: ac:7b:a1:10:21:74 DHCP selecting relay 1 - control block settings:
dhcpServer: 192.168.254.254, dhcpNetmask: 0.0.0.0,
dhcpGateway: 0.0.0.0, dhcpRelay: 192.168.254.253 VLAN: 51
*DHCP Socket Task: Dec 15 15:57:35.045: ac:7b:a1:10:21:74 DHCP selected relay 1 - 192.168.254.254 (local address 192.168.254.253, gateway 192.168.254.254, VLAN 51, port 1)
*DHCP Socket Task: Dec 15 15:57:35.045: ac:7b:a1:10:21:74 DHCP transmitting DHCP REQUEST (3)
*DHCP Socket Task: Dec 15 15:57:35.045: ac:7b:a1:10:21:74 DHCP op: BOOTREQUEST, htype: Ethernet, hlen: 6, hops: 1
*DHCP Socket Task: Dec 15 15:57:35.045: ac:7b:a1:10:21:74 DHCP xid: 0xc7944f1b (3348385563), secs: 0, flags: 0
*DHCP Socket Task: Dec 15 15:57:35.045: ac:7b:a1:10:21:74 DHCP chaddr: ac:7b:a1:10:21:74
*DHCP Socket Task: Dec 15 15:57:35.045: ac:7b:a1:10:21:74 DHCP ciaddr: 0.0.0.0, yiaddr: 0.0.0.0
*DHCP Socket Task: Dec 15 15:57:35.045: ac:7b:a1:10:21:74 DHCP siaddr: 0.0.0.0, giaddr: 192.168.254.253
*DHCP Socket Task: Dec 15 15:57:35.045: ac:7b:a1:10:21:74 DHCP requested ip: 192.168.254.184
*DHCP Socket Task: Dec 15 15:57:35.045: ac:7b:a1:10:21:74 DHCP server id: 192.168.254.254 rcvd server id: 192.0.2.1
*DHCP Socket Task: Dec 15 15:57:35.045: ac:7b:a1:10:21:74 DHCP sending REQUEST to 192.168.254.254 (len 374, port 1, vlan 51)
*DHCP Socket Task: Dec 15 15:57:35.045: ac:7b:a1:10:21:74 DHCP selecting relay 2 - control block settings:
dhcpServer: 192.168.254.254, dhcpNetmask: 0.0.0.0,
dhcpGateway: 0.0.0.0, dhcpRelay: 192.168.254.253 VLAN: 51
*DHCP Socket Task: Dec 15 15:57:35.045: ac:7b:a1:10:21:74 DHCP selected relay 2 - NONE
*DHCP Socket Task: Dec 15 15:57:35.050: ac:7b:a1:10:21:74 DHCP received op BOOTREPLY (2) (len 278,vlan 51, port 1, encap 0xec00)
*DHCP Socket Task: Dec 15 15:57:35.050: ac:7b:a1:10:21:74 DHCP sending REPLY to STA (len 414, port 1, vlan 0)
*DHCP Socket Task: Dec 15 15:57:35.050: ac:7b:a1:10:21:74 DHCP transmitting DHCP NAK (6)
*DHCP Socket Task: Dec 15 15:57:35.050: ac:7b:a1:10:21:74 DHCP op: BOOTREPLY, htype: Ethernet, hlen: 6, hops: 0
*DHCP Socket Task: Dec 15 15:57:35.050: ac:7b:a1:10:21:74 DHCP xid: 0xc7944f1b (3348385563), secs: 0, flags: 0
*DHCP Socket Task: Dec 15 15:57:35.050: ac:7b:a1:10:21:74 DHCP chaddr: ac:7b:a1:10:21:74
*DHCP Socket Task: Dec 15 15:57:35.050: ac:7b:a1:10:21:74 DHCP ciaddr: 0.0.0.0, yiaddr: 0.0.0.0
*DHCP Socket Task: Dec 15 15:57:35.050: ac:7b:a1:10:21:74 DHCP siaddr: 0.0.0.0, giaddr: 0.0.0.0
*DHCP Socket Task: Dec 15 15:57:35.050: ac:7b:a1:10:21:74 DHCP server id: 192.0.2.1 rcvd server id: 192.168.254.254
*DHCP Socket Task: Dec 15 15:57:35.056: ac:7b:a1:10:21:74 DHCP received op BOOTREQUEST (1) (len 308,vlan 0, port 1, encap 0xec03)
*DHCP Socket Task: Dec 15 15:57:35.056: ac:7b:a1:10:21:74 DHCP selecting relay 1 - control block settings:
dhcpServer: 0.0.0.0, dhcpNetmask: 0.0.0.0,
dhcpGateway: 0.0.0.0, dhcpRelay: 0.0.0.0 VLAN: 0
*DHCP Socket Task: Dec 15 15:57:35.056: ac:7b:a1:10:21:74 DHCP selected relay 1 - 192.168.254.254 (local address 192.168.254.253, gateway 192.168.254.254, VLAN 51, port 1)
*DHCP Socket Task: Dec 15 15:57:35.056: ac:7b:a1:10:21:74 DHCP transmitting DHCP DISCOVER (1)
*DHCP Socket Task: Dec 15 15:57:35.056: ac:7b:a1:10:21:74 DHCP op: BOOTREQUEST, htype: Ethernet, hlen: 6, hops: 1
*DHCP Socket Task: Dec 15 15:57:35.056: ac:7b:a1:10:21:74 DHCP xid: 0xa0788169 (2692252009), secs: 0, flags: 0
*DHCP Socket Task: Dec 15 15:57:35.056: ac:7b:a1:10:21:74 DHCP chaddr: ac:7b:a1:10:21:74
*DHCP Socket Task: Dec 15 15:57:35.056: ac:7b:a1:10:21:74 DHCP ciaddr: 0.0.0.0, yiaddr: 0.0.0.0
*DHCP Socket Task: Dec 15 15:57:35.056: ac:7b:a1:10:21:74 DHCP siaddr: 0.0.0.0, giaddr: 192.168.254.253
*DHCP Socket Task: Dec 15 15:57:35.056: ac:7b:a1:10:21:74 DHCP sending REQUEST to 192.168.254.254 (len 350, port 1, vlan 51)
*DHCP Socket Task: Dec 15 15:57:35.056: ac:7b:a1:10:21:74 DHCP selecting relay 2 - control block settings:
dhcpServer: 0.0.0.0, dhcpNetmask: 0.0.0.0,
dhcpGateway: 0.0.0.0, dhcpRelay: 192.168.254.253 VLAN: 51
*DHCP Socket Task: Dec 15 15:57:35.056: ac:7b:a1:10:21:74 DHCP selected relay 2 - NONE

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(Cisco Controller) >debug A*DHCP Socket Task: Dec 15 15:57:37.486: ac:7b:a1:10:21:74 DHCP received op BOOTREQUEST (1) (len 308,vlan 0, port 1, encap 0xec03)
*DHCP Socket Task: Dec 15 15:57:37.486: ac:7b:a1:10:21:74 DHCP selecting relay 1 - control block settings:
dhcpServer: 0.0.0.0, dhcpNetmask: 0.0.0.0,
dhcpGateway: 0.0.0.0, dhcpRelay: 192.168.254.253 VLAN: 51
*DHCP Socket Task: Dec 15 15:57:37.486: ac:7b:a1:10:21:74 DHCP selected relay 1 - 192.168.254.254 (local address 192.168.254.253, gateway 192.168.254.254, VLAN 51, port 1)
*DHCP Socket Task: Dec 15 15:57:37.486: ac:7b:a1:10:21:74 DHCP transmitting DHCP DISCOVER (1)
*DHCP Socket Task: Dec 15 15:57:37.486: ac:7b:a1:10:21:74 DHCP op: BOOTREQUEST, htype: Ethernet, hlen: 6, hops: 1
*DHCP Socket Task: Dec 15 15:57:37.486: ac:7b:a1:10:21:74 DHCP xid: 0xa0788169 (2692252009), secs: 768, flags: 0
*DHCP Socket Task: Dec 15 15:57:37.486: ac:7b:a1:10:21:74 DHCP chaddr: ac:7b:a1:10:21:74
*DHCP Socket Task: Dec 15 15:57:37.486: ac:7b:a1:10:21:74 DHCP ciaddr: 0.0.0.0, yiaddr: 0.0.0.0
*DHCP Socket Task: Dec 15 15:57:37.486: ac:7b:a1:10:21:74 DHCP siaddr: 0.0.0.0, giaddr: 192.168.254.253
*DHCP Socket Task: Dec 15 15:57:37.486: ac:7b:a1:10:21:74 DHCP sending REQUEST to 192.168.254.254 (len 350, port 1, vlan 51)
*DHCP Socket Task: Dec 15 15:57:37.486: ac:7b:a1:10:21:74 DHCP selecting relay 2 - control block settings:
dhcpServer: 0.0.0.0, dhcpNetmask: 0.0.0.0,
dhcpGateway: 0.0.0.0, dhcpRelay: 192.168.254.253 VLAN: 51
*DHCP Socket Task: Dec 15 15:57:37.486: ac:7b:a1:10:21:74 DHCP selected relay 2 - NONE

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(Cisco Controller) >
(Cisco Controller) >
(Cisco Controller) >
(Cisco Controller) >
(Cisco Controller) >*DHCP Socket Task: Dec 15 15:57:40.021: ac:7b:a1:10:21:74 DHCP received op BOOTREPLY (2) (len 295,vlan 51, port 1, encap 0xec00)
*DHCP Socket Task: Dec 15 15:57:40.021: ac:7b:a1:10:21:74 DHCP setting server from OFFER (server 192.168.254.254, yiaddr 192.168.254.186)
*DHCP Socket Task: Dec 15 15:57:40.022: ac:7b:a1:10:21:74 DHCP sending REPLY to STA (len 414, port 1, vlan 0)
*DHCP Socket Task: Dec 15 15:57:40.022: ac:7b:a1:10:21:74 DHCP transmitting DHCP OFFER (2)
*DHCP Socket Task: Dec 15 15:57:40.022: ac:7b:a1:10:21:74 DHCP op: BOOTREPLY, htype: Ethernet, hlen: 6, hops: 0
*DHCP Socket Task: Dec 15 15:57:40.022: ac:7b:a1:10:21:74 DHCP xid: 0xa0788169 (2692252009), secs: 0, flags: 0
*DHCP Socket Task: Dec 15 15:57:40.022: ac:7b:a1:10:21:74 DHCP chaddr: ac:7b:a1:10:21:74
*DHCP Socket Task: Dec 15 15:57:40.022: ac:7b:a1:10:21:74 DHCP ciaddr: 0.0.0.0, yiaddr: 192.168.254.186
*DHCP Socket Task: Dec 15 15:57:40.022: ac:7b:a1:10:21:74 DHCP siaddr: 0.0.0.0, giaddr: 0.0.0.0
*DHCP Socket Task: Dec 15 15:57:40.022: ac:7b:a1:10:21:74 DHCP server id: 192.0.2.1 rcvd server id: 192.168.254.254
*DHCP Socket Task: Dec 15 15:57:40.023: ac:7b:a1:10:21:74 DHCP received op BOOTREQUEST (1) (len 329,vlan 0, port 1, encap 0xec03)
*DHCP Socket Task: Dec 15 15:57:40.024: ac:7b:a1:10:21:74 DHCP selecting relay 1 - control block settings:
dhcpServer: 192.168.254.254, dhcpNetmask: 0.0.0.0,
dhcpGateway: 0.0.0.0, dhcpRelay: 192.168.254.253 VLAN: 51
*DHCP Socket Task: Dec 15 15:57:40.024: ac:7b:a1:10:21:74 DHCP selected relay 1 - 192.168.254.254 (local address 192.168.254.253, gateway 192.168.254.254, VLAN 51, port 1)
*DHCP Socket Task: Dec 15 15:57:40.024: ac:7b:a1:10:21:74 DHCP transmitting DHCP REQUEST (3)
*DHCP Socket Task: Dec 15 15:57:40.024: ac:7b:a1:10:21:74 DHCP op: BOOTREQUEST, htype: Ethernet, hlen: 6, hops: 1
*DHCP Socket Task: Dec 15 15:57:40.024: ac:7b:a1:10:21:74 DHCP xid: 0xa0788169 (2692252009), secs: 768, flags: 0
*DHCP Socket Task: Dec 15 15:57:40.024: ac:7b:a1:10:21:74 DHCP chaddr: ac:7b:a1:10:21:74
*DHCP Socket Task: Dec 15 15:57:40.024: ac:7b:a1:10:21:74 DHCP ciaddr: 0.0.0.0, yiaddr: 0.0.0.0
*DHCP Socket Task: Dec 15 15:57:40.024: ac:7b:a1:10:21:74 DHCP siaddr: 0.0.0.0, giaddr: 192.168.254.253
*DHCP Socket Task: Dec 15 15:57:40.024: ac:7b:a1:10:21:74 DHCP requested ip: 192.168.254.186
*DHCP Socket Task: Dec 15 15:57:40.024: ac:7b:a1:10:21:74 DHCP server id: 192.168.254.254 rcvd server id: 192.0.2.1
*DHCP Socket Task: Dec 15 15:57:40.024: ac:7b:a1:10:21:74 DHCP sending REQUEST to 192.168.254.254 (len 374, port 1, vlan 51)
*DHCP Socket Task: Dec 15 15:57:40.024: ac:7b:a1:10:21:74 DHCP selecting relay 2 - control block settings:
dhcpServer: 192.168.254.254, dhcpNetmask: 0.0.0.0,
dhcpGateway: 0.0.0.0, dhcpRelay: 192.168.254.253 VLAN: 51
*DHCP Socket Task: Dec 15 15:57:40.024: ac:7b:a1:10:21:74 DHCP selected relay 2 - NONE
*DHCP Socket Task: Dec 15 15:57:40.040: ac:7b:a1:10:21:74 DHCP received op BOOTREPLY (2) (len 278,vlan 51, port 1, encap 0xec00)
*DHCP Socket Task: Dec 15 15:57:40.040: ac:7b:a1:10:21:74 DHCP sending REPLY to STA (len 414, port 1, vlan 0)
*DHCP Socket Task: Dec 15 15:57:40.040: ac:7b:a1:10:21:74 DHCP transmitting DHCP NAK (6)
*DHCP Socket Task: Dec 15 15:57:40.040: ac:7b:a1:10:21:74 DHCP op: BOOTREPLY, htype: Ethernet, hlen: 6, hops: 0
*DHCP Socket Task: Dec 15 15:57:40.040: ac:7b:a1:10:21:74 DHCP xid: 0xa0788169 (2692252009), secs: 0, flags: 0
*DHCP Socket Task: Dec 15 15:57:40.040: ac:7b:a1:10:21:74 DHCP chaddr: ac:7b:a1:10:21:74
*DHCP Socket Task: Dec 15 15:57:40.040: ac:7b:a1:10:21:74 DHCP ciaddr: 0.0.0.0, yiaddr: 0.0.0.0
*DHCP Socket Task: Dec 15 15:57:40.040: ac:7b:a1:10:21:74 DHCP siaddr: 0.0.0.0, giaddr: 0.0.0.0
*DHCP Socket Task: Dec 15 15:57:40.040: ac:7b:a1:10:21:74 DHCP server id: 192.0.2.1 rcvd server id: 192.168.254.254
*DHCP Socket Task: Dec 15 15:57:40.044: ac:7b:a1:10:21:74 DHCP received op BOOTREQUEST (1) (len 308,vlan 0, port 1, encap 0xec03)
*DHCP Socket Task: Dec 15 15:57:40.044: ac:7b:a1:10:21:74 DHCP selecting relay 1 - control block settings:
dhcpServer: 0.0.0.0, dhcpNetmask: 0.0.0.0,
dhcpGateway: 0.0.0.0, dhcpRelay: 0.0.0.0 VLAN: 0
*DHCP Socket Task: Dec 15 15:57:40.044: ac:7b:a1:10:21:74 DHCP selected relay 1 - 192.168.254.254 (local address 192.168.254.253, gateway 192.168.254.254, VLAN 51, port 1)
*DHCP Socket Task: Dec 15 15:57:40.044: ac:7b:a1:10:21:74 DHCP transmitting DHCP DISCOVER (1)
*DHCP Socket Task: Dec 15 15:57:40.044: ac:7b:a1:10:21:74 DHCP op: BOOTREQUEST, htype: Ethernet, hlen: 6, hops: 1
*DHCP Socket Task: Dec 15 15:57:40.044: ac:7b:a1:10:21:74 DHCP xid: 0x99a9937f (2578027391), secs: 0, flags: 0
*DHCP Socket Task: Dec 15 15:57:40.044: ac:7b:a1:10:21:74 DHCP chaddr: ac:7b:a1:10:21:74
*DHCP Socket Task: Dec 15 15:57:40.044: ac:7b:a1:10:21:74 DHCP ciaddr: 0.0.0.0, yiaddr: 0.0.0.0
*DHCP Socket Task: Dec 15 15:57:40.044: ac:7b:a1:10:21:74 DHCP siaddr: 0.0.0.0, giaddr: 192.168.254.253
*DHCP Socket Task: Dec 15 15:57:40.045: ac:7b:a1:10:21:74 DHCP sending REQUEST to 192.168.254.254 (len 350, port 1, vlan 51)
*DHCP Socket Task: Dec 15 15:57:40.045: ac:7b:a1:10:21:74 DHCP selecting relay 2 - control block settings:
dhcpServer: 0.0.0.0, dhcpNetmask: 0.0.0.0,
dhcpGateway: 0.0.0.0, dhcpRelay: 192.168.254.253 VLAN: 51
debug*DHCP Socket Task: Dec 15 15:57:40.045: ac:7b:a1:10:21:74 DHCP selected relay 2 - NONE
*DHCP Socket Task: Dec 15 15:57:42.058: ac:7b:a1:10:21:74 DHCP received op BOOTREPLY (2) (len 295,vlan 51, port 1, encap 0xec00)
*DHCP Socket Task: Dec 15 15:57:42.058: ac:7b:a1:10:21:74 DHCP setting server from OFFER (server 192.168.254.254, yiaddr 192.168.254.191)
*DHCP Socket Task: Dec 15 15:57:42.058: ac:7b:a1:10:21:74 DHCP sending REPLY to STA (len 414, port 1, vlan 0)
*DHCP Socket Task: Dec 15 15:57:42.058: ac:7b:a1:10:21:74 DHCP transmitting DHCP OFFER (2)
*DHCP Socket Task: Dec 15 15:57:42.058: ac:7b:a1:10:21:74 DHCP op: BOOTREPLY, htype: Ethernet, hlen: 6, hops: 0
*DHCP Socket Task: Dec 15 15:57:42.058: ac:7b:a1:10:21:74 DHCP xid: 0x99a9937f (2578027391), secs: 0, flags: 0
*DHCP Socket Task: Dec 15 15:57:42.058: ac:7b:a1:10:21:74 DHCP chaddr: ac:7b:a1:10:21:74
*DHCP Socket Task: Dec 15 15:57:42.058: ac:7b:a1:10:21:74 DHCP ciaddr: 0.0.0.0, yiaddr: 192.168.254.191
*DHCP Socket Task: Dec 15 15:57:42.058: ac:7b:a1:10:21:74 DHCP siaddr: 0.0.0.0, giaddr: 0.0.0.0
*DHCP Socket Task: Dec 15 15:57:42.058: ac:7b:a1:10:21:74 DHCP server id: 192.0.2.1 rcvd server id: 192.168.254.254
*DHCP Socket Task: Dec 15 15:57:42.061: ac:7b:a1:10:21:74 DHCP received op BOOTREQUEST (1) (len 329,vlan 0, port 1, encap 0xec03)
*DHCP Socket Task: Dec 15 15:57:42.061: ac:7b:a1:10:21:74 DHCP selecting relay 1 - control block settings:
dhcpServer: 192.168.254.254, dhcpNetmask: 0.0.0.0,
dhcpGateway: 0.0.0.0, dhcpRelay: 192.168.254.253 VLAN: 51
*DHCP Socket Task: Dec 15 15:57:42.061: ac:7b:a1:10:21:74 DHCP selected relay 1 - 192.168.254.254 (local address 192.168.254.253, gateway 192.168.254.254, VLAN 51, port 1)
*DHCP Socket Task: Dec 15 15:57:42.061: ac:7b:a1:10:21:74 DHCP transmitting DHCP REQUEST (3)
*DHCP Socket Task: Dec 15 15:57:42.061: ac:7b:a1:10:21:74 DHCP op: BOOTREQUEST, htype: Ethernet, hlen: 6, hops: 1
*DHCP Socket Task: Dec 15 15:57:42.061: ac:7b:a1:10:21:74 DHCP xid: 0x99a9937f (2578027391), secs: 0, flags: 0
*DHCP Socket Task: Dec 15 15:57:42.061: ac:7b:a1:10:21:74 DHCP chaddr: ac:7b:a1:10:21:74
*DHCP Socket Task: Dec 15 15:57:42.061: ac:7b:a1:10:21:74 DHCP ciaddr: 0.0.0.0, yiaddr: 0.0.0.0
*DHCP Socket Task: Dec 15 15:57:42.061: ac:7b:a1:10:21:74 DHCP siaddr: 0.0.0.0, giaddr: 192.168.254.253
*DHCP Socket Task: Dec 15 15:57:42.061: ac:7b:a1:10:21:74 DHCP requested ip: 192.168.254.191
*DHCP Socket Task: Dec 15 15:57:42.061: ac:7b:a1:10:21:74 DHCP server id: 192.168.254.254 rcvd server id: 192.0.2.1
*DHCP Socket Task: Dec 15 15:57:42.062: ac:7b:a1:10:21:74 DHCP sending REQUEST to 192.168.254.254 (len 374, port 1, vlan 51)
*DHCP Socket Task: Dec 15 15:57:42.062: ac:7b:a1:10:21:74 DHCP selecting relay 2 - control block settings:
dhcpServer: 192.168.254.254, dhcpNetmask: 0.0.0.0,
dhcpGateway: 0.0.0.0, dhcpRelay: 192.168.254.253 VLAN: 51
*DHCP Socket Task: Dec 15 15:57:42.062: ac:7b:a1:10:21:74 DHCP selected relay 2 - NONE
*DHCP Socket Task: Dec 15 15:57:42.069: ac:7b:a1:10:21:74 DHCP received op BOOTREPLY (2) (len 278,vlan 51, port 1, encap 0xec00)
*DHCP Socket Task: Dec 15 15:57:42.070: ac:7b:a1:10:21:74 DHCP sending REPLY to STA (len 414, port 1, vlan 0)
*DHCP Socket Task: Dec 15 15:57:42.070: ac:7b:a1:10:21:74 DHCP transmitting DHCP NAK (6)
*DHCP Socket Task: Dec 15 15:57:42.070: ac:7b:a1:10:21:74 DHCP op: BOOTREPLY, htype: Ethernet, hlen: 6, hops: 0
*DHCP Socket Task: Dec 15 15:57:42.070: ac:7b:a1:10:21:74 DHCP xid: 0x99a9937f (2578027391), secs: 0, flags: 0
*DHCP Socket Task: Dec 15 15:57:42.070: ac:7b:a1:10:21:74 DHCP chaddr: ac:7b:a1:10:21:74
*DHCP Socket Task: Dec 15 15:57:42.070: ac:7b:a1:10:21:74 DHCP ciaddr: 0.0.0.0, yiaddr: 0.0.0.0
*DHCP Socket Task: Dec 15 15:57:42.070: ac:7b:a1:10:21:74 DHCP siaddr: 0.0.0.0, giaddr: 0.0.0.0
*DHCP Socket Task: Dec 15 15:57:42.070: ac:7b:a1:10:21:74 DHCP server id: 192.0.2.1 rcvd server id: 192.168.254.254
*DHCP Socket Task: Dec 15 15:57:42.076: ac:7b:a1:10:21:74 DHCP received op BOOTREQUEST (1) (len 308,vlan 0, port 1, encap 0xec03)
*DHCP Socket Task: Dec 15 15:57:42.076: ac:7b:a1:10:21:74 DHCP selecting relay 1 - control block settings:
dhcpServer: 0.0.0.0, dhcpNetmask: 0.0.0.0,
dhcpGateway: 0.0.0.0, dhcpRelay: 0.0.0.0 VLAN: 0
*DHCP Socket Task: Dec 15 15:57:42.076: ac:7b:a1:10:21:74 DHCP selected relay 1 - 192.168.254.254 (local address 192.168.254.253, gateway 192.168.254.254, VLAN 51, port 1)
*DHCP Socket Task: Dec 15 15:57:42.076: ac:7b:a1:10:21:74 DHCP transmitting DHCP DISCOVER (1)
*DHCP Socket Task: Dec 15 15:57:42.076: ac:7b:a1:10:21:74 DHCP op: BOOTREQUEST, htype: Ethernet, hlen: 6, hops: 1
*DHCP Socket Task: Dec 15 15:57:42.076: ac:7b:a1:10:21:74 DHCP xid: 0x35c06675 (901801589), secs: 0, flags: 0
*DHCP Socket Task: Dec 15 15:57:42.076: ac:7b:a1:10:21:74 DHCP chaddr: ac:7b:a1:10:21:74
*DHCP Socket Task: Dec 15 15:57:42.076: ac:7b:a1:10:21:74 DHCP ciaddr: 0.0.0.0, yiaddr: 0.0.0.0
*DHCP Socket Task: Dec 15 15:57:42.076: ac:7b:a1:10:21:74 DHCP siaddr: 0.0.0.0, giaddr: 192.168.254.253
*DHCP Socket Task: Dec 15 15:57:42.076: ac:7b:a1:10:21:74 DHCP sending REQUEST to 192.168.254.254 (len 350, port 1, vlan 51)
*DHCP Socket Task: Dec 15 15:57:42.076: ac:7b:a1:10:21:74 DHCP selecting relay 2 - control block settings:
dhcpServer: 0.0.0.0, dhcpNetmask: 0.0.0.0,
dhcpGateway: 0.0.0.0, dhcpRelay: 192.168.254.253 VLAN: 51
*DHCP Socket Task: Dec 15 15:57:42.076: ac:7b:a1:10:21:74 DHCP selected relay 2 - NONE

David Watkins · ‎12-16-2014

The client shows it is receiving the offer and sending a request back to the DHCP server. The server is sending a NAK back to the client's request.

DISCOVER

*DHCP Socket Task: Dec 15 15:57:37.486: ac:7b:a1:10:21:74 DHCP transmitting DHCP DISCOVER (1)
*DHCP Socket Task: Dec 15 15:57:37.486: ac:7b:a1:10:21:74 DHCP op: BOOTREQUEST, htype: Ethernet, hlen: 6, hops: 1

OFFER

*DHCP Socket Task: Dec 15 15:57:40.021: ac:7b:a1:10:21:74 DHCP received op BOOTREPLY (2) (len 295,vlan 51, port 1, encap 0xec00)
*DHCP Socket Task: Dec 15 15:57:40.021: ac:7b:a1:10:21:74 DHCP setting server from OFFER (server 192.168.254.254, yiaddr 192.168.254.186)
*DHCP Socket Task: Dec 15 15:57:40.022: ac:7b:a1:10:21:74 DHCP sending REPLY to STA (len 414, port 1, vlan 0)

*DHCP Socket Task: Dec 15 15:57:40.022: ac:7b:a1:10:21:74 DHCP transmitting DHCP OFFER (2)

REQUEST

*DHCP Socket Task: Dec 15 15:57:40.023: ac:7b:a1:10:21:74 DHCP received op BOOTREQUEST (1) (len 329,vlan 0, port 1, encap 0xec03)
*DHCP Socket Task: Dec 15 15:57:40.024: ac:7b:a1:10:21:74 DHCP selecting relay 1 - control block settings:
dhcpServer: 192.168.254.254, dhcpNetmask: 0.0.0.0,
dhcpGateway: 0.0.0.0, dhcpRelay: 192.168.254.253 VLAN: 51
*DHCP Socket Task: Dec 15 15:57:40.024: ac:7b:a1:10:21:74 DHCP selected relay 1 - 192.168.254.254 (local address 192.168.254.253, gateway 192.168.254.254, VLAN 51, port 1)
*DHCP Socket Task: Dec 15 15:57:40.024: ac:7b:a1:10:21:74 DHCP transmitting DHCP REQUEST (3)
*DHCP Socket Task: Dec 15 15:57:40.024: ac:7b:a1:10:21:74 DHCP op: BOOTREQUEST, htype: Ethernet, hlen: 6, hops: 1

NAK!

*DHCP Socket Task: Dec 15 15:57:40.040: ac:7b:a1:10:21:74 DHCP received op BOOTREPLY (2) (len 278,vlan 51, port 1, encap 0xec00)
*DHCP Socket Task: Dec 15 15:57:40.040: ac:7b:a1:10:21:74 DHCP sending REPLY to STA (len 414, port 1, vlan 0)
*DHCP Socket Task: Dec 15 15:57:40.040: ac:7b:a1:10:21:74 DHCP transmitting DHCP NAK (6)
*DHCP Socket Task: Dec 15 15:57:40.040: ac:7b:a1:10:21:74 DHCP op: BOOTREPLY, htype: Ethernet, hlen: 6, hops: 0

The WLC is sending the traffic properly. The DHCP server is sending back a NAK to the Client REQUEST. It's a bit odd because the client is making a Request to the same DHCP server, with the same transaction ID, with the same "offered" IP address. Once the DHCP Server sends back an "ACK" instead of a "NAK", then you will be good.

What is the device offering DHCP? You might consider getting rid of DHCP-Proxy and simply bridging the traffic over. Can you take a "wired" client and place them on VLAN 51 of that same switch and get an IP address?

marioderosa2008 · ‎01-04-2015

Thanks for the reply.

it turned out that the broadband routing hosting the DHCP scope was the issue... not sure why it did not like the DHCP requests coming from the Wireless, but sure enough when i swapped it out with an old Cisco 877 with a basic DHCP scope, all works fine now.

thanks

Mario

Scott Fella · ‎01-04-2015

Didn't like it probably because by default, the WLC has dhcp proxy enabled. There are various dhcp servers that will not respond to a proxy dhcp request and the fix is to disable that. Of course, replacing the dhcp with something that works fine with dhcp proxy will most likely work as in your case.

-Scott

-Scott
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