DHCP server icx 7750

[flemming_hansen]

After upgrading icx 7750 from 08.0.40 to 08.0.80 My multiple DHCP servers is malfunctioning.

A PC can get a lease, but a iPhone or IP phone cannot get a lease. 

What can be wrong?

[PC_JP]

@Benbeck 

Please check it. 

[PC_JP]

SW version is 08.0.95pT203

I have created 2 VLANS. For example vlan 100 and vlan 101
For vlan 100 I have used the dhcp pool created on ICX7750 and For Vlan 101 I used the TP-link router to provide DHCP. Both PC+ Mobile working fine with VLAN101 in SSID101 but VLAN 100 has SSID 100 in AP on which only PC get connects.

On checking via Wireshark:

--On Laptop (Wi-Fi)
--Receives DHCP Pool Address
DHCP Request:
*Option:(50) Requested IP address (192.168.92.4)
DHCP ACK:
*Option:(54) DHCP Server Identifier(192.168.92.1)

--On Mobile (Same Wi-Fi)
--Do not lease IP address, no Request and ACK, Only Discover is seen in Wireshark
*Option:(53) DHCP Message Type (Discover)
DHCP: Discover (1)
*Option:(61) Client Identifier
Client Mac Address:<------>
*OPtion:(12) Hostname
Hostname: <Redmi-12-5G>
*option:(55) Parameter Request list
Length:12
Parameter Request List Item: (1) Subnet mask
Parameter Request List Item: (3) Router
Parameter Request List Item: (6) Domain name Server
Parameter Request List Item: (15) Domain name
Parameter Request List Item: (26) Interface MTU
Parameter Request List Item: (28) Broadcast Address
Parameter Request List Item: (51) IP Address lease time
Parameter Request List Item: (58) Renewal time value
Parameter Request List Item: (43) vendor-specific Information
Parameter Request List Item:(114) DHCP Captive-Portal
Parameter Request List Item: (108) IPv6-Only Preferred

switch configuration:
ip dhcp-server pool vlan100
excluded-address 192.168.92.1
!
excluded-address 192.168.92.100 192.168.92.254
lease 1 0 0
network 192.168.92.0 255.255.255.0
option 3 ip 192.168.92.1
deploy
ip helper-use-responder-ip

interface ve 100
vrf forwarding abc
ip address 192.168.92.1 255.255.255.0
ip helper-address 1 192.168.92.1

also globally i have enabled
ip dhcp-server enable
ip dhcp-server relay-agent-echo enable

[netwizz]

Are they within a different VLAN?

If yes, did you not save before the reload and perhaps loose some configuration settings such as the ip helper addresses?

[jijo_panangat]

You may run a wire shark on the server/client and check if the iPhone gets an dhcp-offer from server, At least we will know in which phase it is failing in the DORA process.

Please open a tac case as this requires a troubleshooting session to isolate the problem.