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July 6th, 2022 10:00

N2048P Unable to get IP Helper/DHCP Relay to work

Hello,

We are trying to move our VLANs from our firewall to our layer 3 PowerConnect N2048P because of network growth in our environment, but we can't get the IP Helper/DHCP Relay to function correctly. We are seeing the DHCP discover in both the server and the client, then DHCP offer on the server but the client doesn't send a request so there's no acknowledgement. The firewall (Sonicwall NSA) IP Helper is working as it's supposed to. We are able to give the client a static IP on the test VLAN we set up on the N2048P and it connects internally and externally just fine, so it is just the DHCP relay that's causing the issue. VLAN2 is the only VLAN we have running through the N2048P for testing purposes. Below is my config, does anyone see anything wrong? (I put the test VLAN in bold below)

!Current Configuration:
!System Description "Dell EMC Networking N2048P, 6.7.1.6, Linux 4.14.174, Not Av ailable"
!System Software Version 6.7.1.6
!
configure
vlan 2,10-11,15,20,30-32,50,60,90,100
exit
vlan 2
name "TESTVLAN"
exit
vlan 10
name "1stFloor"
exit
vlan 11
name "IT"
exit
vlan 15
name "Voice"
exit
vlan 20
name "2ndFloor"
exit
vlan 30
name "3rdFloor"
exit
vlan 31
name "MechEng"
exit
vlan 32
name "ElecEng"
exit
vlan 50
name "PrivateWiFi"
exit
vlan 60
name "GuestWiFi"
exit
vlan 90
name "Cameras"
exit
vlan 100
name "Servers"
exit
slot 1/0 4 ! Dell EMC Networking N2048P
slot 2/0 4 ! Dell EMC Networking N2048P
slot 3/0 4 ! Dell EMC Networking N2048P
stack
member 1 4 ! N2048P
member 2 4 ! N2048P
member 3 4 ! N2048P
exit
ip name-server "10.0.0.16"
ip name-server "10.0.0.17"
ip access-list Private_VLAN
exit
ip routing
no ip dhcp relay information check
ip helper-address 10.0.0.16 dhcp
ip helper-address 10.0.0.17 dhcp
interface vlan 1
ip address 10.0.0.40 255.255.248.0
exit
interface vlan 2
ip address 10.8.0.1 255.255.255.0
ip helper-address 10.0.0.16 dhcp
ip helper-address 10.0.0.17 dhcp
ip helper-address 10.0.0.16 68
ip helper-address 10.0.0.17 68
exit
interface vlan 10
ip directed-broadcast
exit
interface vlan 20
ip directed-broadcast
exit
interface vlan 30
ip directed-broadcast
exit
interface vlan 31
exit
interface vlan 60
ip directed-broadcast
exit
ip route 0.0.0.0 0.0.0.0 10.0.0.10
switchport voice vlan
application install SupportAssist auto-restart start-on-boot
ip dhcp snooping
ip dhcp snooping vlan 10,20,30
dhcp l2relay
dhcp l2relay vlan 2,32-33
!
interface Gi1/0/1
switchport access vlan 90
switchport voice vlan 15
exit
!
interface Gi1/0/2
switchport access vlan 90
exit
!
interface Gi1/0/3
switchport access vlan 90
exit
!
interface Gi1/0/4
switchport access vlan 90
exit
!
interface Gi1/0/5
switchport access vlan 90
exit
!
interface Gi1/0/6
switchport access vlan 90
exit
!
interface Gi1/0/7
switchport access vlan 90
exit
!
interface Gi1/0/8
switchport access vlan 90
exit
!
interface Gi1/0/9
switchport access vlan 90
exit
!
interface Gi1/0/10
switchport access vlan 90
exit
!
interface Gi1/0/11
switchport access vlan 90
exit
!
interface Gi1/0/34
switchport mode general
switchport general allowed vlan add 15 tagged
vlan priority 6
exit
!
interface Gi1/0/35
description "Service AP"
switchport mode general
switchport general allowed vlan add 50,60 tagged
exit
!
interface Gi1/0/47
dhcp l2relay
spanning-tree portfast
switchport mode general
switchport general allowed vlan add 30,50,60 tagged
switchport access vlan 30
exit
!
interface Gi1/0/48
dhcp l2relay
spanning-tree portfast
switchport general pvid 31
exit
!
interface Te1/0/1
gvrp enable
switchport mode trunk
exit
!
interface Te1/0/2
gvrp enable
switchport mode trunk
exit
!
interface Gi2/0/1
dhcp l2relay
switchport access vlan 2
exit
!
interface Gi2/0/8
dhcp l2relay
spanning-tree portfast
exit
!
interface Gi2/0/9
channel-group 1 mode active
exit
!
interface Gi2/0/11
channel-group 1 mode active
exit
!
interface Gi2/0/13
channel-group 1 mode active
exit
!
interface Gi2/0/15
channel-group 1 mode active
exit
!
interface Te2/0/1
gvrp enable
switchport mode trunk
exit
!
interface Te2/0/2
gvrp enable
switchport mode trunk
exit

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