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kakalonso

6 Posts

9749

January 30th, 2018 17:00

DHCP on S3124F

Hi all,

I have a S3124F switch. I create 3 vlans and 3 DHCP pools. Those are:
- Interface Vlan 10 - IP Address 10.0.10.1, DHCP pools: 10.0.10.0/24

- Interface Vlan 12 - IP Address 10.0.12.1, DHCP pools: 10.0.12.0/23

- Interface Vlan 14 - IP Address 10.0.14.1, DHCP pools: 10.0.14.0/23

 

I assign port gi1/23 to vlan 12 via command 
interface vlan 12

untagged giga 1/23

I plugged a computer in port 1/23, if i set the static IP 10.0.12.2/23 it can ping 10.0.12.1.

But if i set it obtain IP from DHCP, it cannot get the IP Address. 
I show dhcp statistic on the switch and see no DHCP packets.

Please help me to fix it. Thank you all.

kakalonso

6 Posts

February 9th, 2018 19:00

I made it work by command "no disable" in mode ip dhcp server. It's disable by default.

murmanov

59 Posts

January 31st, 2018 05:00

Post DHCP config from your switch

Anonymous

5 Practitioner

 • 

274.2K Posts

January 31st, 2018 11:00

The config guide goes through the commands to implement DHCP on the switch. May be worth looking and comparing to your config.

Page 242: http://dell.to/2jOfAOQ

Feel free to post the running config up, we can help look through it.

Checking the logs may be another area to check. # show logging

 

 

 

kakalonso

6 Posts

February 8th, 2018 03:00

Sorry for the late reply. Here is my configuration. I just changed the subnet. The problem is still there. Please help me take a look on it. Thank you.
P/s: Port 23 is an access port, untagged vlan 11.  And pc plugged in this port cannot get ip address from dhcp pool.

 

DellSW-Core#show running-config
Current Configuration ...
! Version 9.10(0.0P1)
! Last configuration change at Wed Feb  7 20:51:55 2018 by default
! Startup-config last updated at Wed Feb  7 20:42:50 2018 by default
!
boot system stack-unit 1 primary system://A
boot system stack-unit 1 secondary system://B
!
hostname DellSW-Core
!
protocol lldp
!
redundancy auto-synchronize full
!
stack-unit 1 provision S3124F
!
interface GigabitEthernet 1/1
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/2
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/3
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/4
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/5
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/6
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/7
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/8
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/9
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/10
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/11
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/12
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/13
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/14
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/15
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/16
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/17
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/18
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/19
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/20
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface GigabitEthernet 1/21
 no ip address
 switchport
 no shutdown
!
interface GigabitEthernet 1/22
 no ip address
 switchport
 no shutdown
!
interface GigabitEthernet 1/23
 no ip address
 switchport
 no shutdown
!
interface GigabitEthernet 1/24
 no ip address
 portmode hybrid
 switchport
 no shutdown
!
interface TenGigabitEthernet 1/25
 no ip address
 shutdown
!
interface TenGigabitEthernet 1/26
 no ip address
 shutdown
!
interface TenGigabitEthernet 1/27
 no ip address
 shutdown
!
interface TenGigabitEthernet 1/28
 no ip address
 shutdown
!
interface ManagementEthernet 1/1
 no ip address
 no shutdown
!
interface ManagementEthernet 2/1
 no shutdown
!
interface ManagementEthernet 3/1
 no shutdown
!
interface ManagementEthernet 4/1
 no shutdown
!
interface ManagementEthernet 5/1
 no shutdown
!
interface ManagementEthernet 6/1
 no shutdown
!
interface ManagementEthernet 7/1
 no shutdown
!
interface ManagementEthernet 8/1
 shutdown
!
interface ManagementEthernet 9/1
 shutdown
!
interface ManagementEthernet 10/1
 shutdown
!
interface ManagementEthernet 11/1
 shutdown
!
interface ManagementEthernet 12/1
 shutdown
!
interface Vlan 1
!untagged GigabitEthernet 1/1-1/20,1/24
 no shutdown
!
interface Vlan 2
 description Management
 name Management
 ip address 10.0.2.1/24
 tagged GigabitEthernet 1/1-1/22,1/24
 no shutdown
!
interface Vlan 10
 description WifiManagement
 name WifiManagement
 ip address 10.0.10.1/24
 tagged GigabitEthernet 1/1-1/22,1/24
 no shutdown
!
interface Vlan 11
 description Wifi-Staff
 name Wifi-Staff
 ip address 10.0.11.1/24
 tagged GigabitEthernet 1/1-1/22,1/24
 untagged GigabitEthernet 1/23
 no shutdown
!
interface Vlan 12
 description Wifi-Guest
 name Wifi-Guest
 ip address 10.0.12.1/23
 tagged GigabitEthernet 1/1-1/22,1/24
 no shutdown
!
interface Vlan 20
 description Staff
 name Staff
 ip address 10.0.20.1/22
 tagged GigabitEthernet 1/1-1/22
 no shutdown
!
interface Vlan 30
 description Server
 name Server
 ip address 10.0.30.1/24
 tagged GigabitEthernet 1/1-1/22
 no shutdown
!
line console 0
line vty 0
line vty 1
line vty 2
line vty 3
line vty 4
line vty 5
line vty 6
line vty 7
line vty 8
line vty 9
!
ip dhcp server
!
 pool WifiGuest
  network 10.0.12.0/23
  default-router 10.0.12.1
  dns-server 8.8.8.8 8.8.4.4
  lease 3 0 0
!
 pool WifiStaff
  network 10.0.11.0/24
  default-router 10.0.11.1
  dns-server 8.8.8.8 8.8.4.4
  lease 3 0 0
!
reload-type
 boot-type normal-reload
 config-scr-download enable
!
end
DellSW-Core#

 

Anonymous

5 Practitioner

 • 

274.2K Posts

February 8th, 2018 05:00

Everything in the configuration looks okay to me. Were there any DHCP messages recorded in the logs? Do the other pools function for the other VLANs?

 

There is a DHCP debug command that you can use to try and gather further information.

debug ip dhcp server

 

Another step you can take, would be to do a packet capture on interface 23. This would give you better insight into what DHCP packets are being sent/received by the client.

Anonymous

5 Practitioner

 • 

274.2K Posts

February 8th, 2018 07:00

There is no inherent ACL on the switch. Do you have ACLs configured on the switch?

kakalonso

6 Posts

February 8th, 2018 07:00

Showing dhcp statistic, i don't see any dhcp packet. So i'm wondering if there is any access list or some thing like that prevent dhcp packet.

kakalonso

6 Posts

February 9th, 2018 05:00

No, i don't. Does the switch block broadcast packet by default? Tomorrow when i'll send you the service tag. Thank for your help.

Anonymous

5 Practitioner

 • 

274.2K Posts

February 9th, 2018 06:00

Thanks so much for the reply to my private message. Really glad to hear that you were able to tweak the DNS server config and get this working.

Cheers!

kakalonso

6 Posts

February 9th, 2018 19:00

Do you reply wrong thread? I hasn't replied your message yet.
My switch still not working. Here is the show ip dhcp server statistic result:

DellSW-Core#show ip dhcp server statistics
Address pools           2
Database agents         0
Automatic bindings      0
Manual bindings         0
Expired bindings        0
Malformed messages      0

Message                 Received
BOOTREQUEST             0
DHCPDISCOVER            0
DHCPREQUEST             0
DHCPDECLINE             0
DHCPRELEASE             0
DHCPINFORM              0

Message                 Sent
BOOTREPLY               0
DHCPOFFER               0
DHCPACK                 0
DHCPNAK                 0
DellSW-Core#

Anonymous

5 Practitioner

 • 

274.2K Posts

February 12th, 2018 05:00

Sorry about that, I did reply to the wrong thread. Really glad to hear you were able to get DHCP working.

Cheers

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