We have a Virtual DHCP server and I'm trying to configure the DHCP Relay on our L3 switch so all VLANs can get an IP Address but cant seem to get it to work. Any advise would be great.

Wanted to expand on my configuration but dont seem to be able to edit my original post, hence the reply. Anyway: DHCP Server (VM) 1 Virtual NIC (10.0.0.1) 3 Scopes for each VLAN: VLAN1 = 10.0.0.0/255.255.240.0 VLAN2 = 192.168.1.0/255.255.255.0 VLAN3 = 192.168.2.0/255.255.255.0 L3 Switch Ports 1,2 connects to the Host that has the DHCP VM Port 48 connects to L2 Switch L2 Switch Port 1 connects to Wireless AP Port 24 connects to L3 Switch Wireles AP Connects to L2 Switch 2 WLAN created with 1 on VLAN2 and the other on VLAN3 Assuming the above what needs to be done to enable a computer on the WLAN to get an IP from the DHCP server in the appropriate scope?

Hi SCGSGAog, Welcome to the community! :) I have not yet encountered to set a DHCP Relay using a VMware DHCP server with the L3 switch. However, let me share this article below and this might help as reference guide: How do I configure a DHCP L3 relay using the web interface on my managed switch? Also, here below are the forum links I have found online and these might help as well: DHCP Relay Netgear managed switches (The GUI method) Netgear GSM7224v2: Help with DHCP Relay! Also, what specific model of NETGEAR L3/L2 switch/es are you using? Kindly indicate the current firmware version of the switch/es. Regards, DaneA NETGEAR Community Team

Hi, Thank you. I've seen those sites before and have based my configuration on them however in regards to the Netgear Howto, the physical configuration is of a physical (from what I can see) dhcp server that is directly connected to the switch (on port 4 with an IP of 10.100.1.1). Our dhcp server is not directly connected as its a virtual server, that being the case there are other virtual servers that will be connecting to the sames port on the L3 switch. Additionally as the APs are connected indirectly via other switches I'm not exactly sure how I would assign IPs to ports. I have enabled DHCP Relay, DHCP L2 Relay, UDP Relay and I've even configured VLAN Routing (i.e. assigned an IP to VLAN2). After configuring VLAN Routing, I noticed that under DHCP Relay>DHCP Status>Requests Relayed showed that there were requests relayed (previously none) but laptop still not getting IP. At the moment I think that potentially requests are being relayed from VLAN2 to VLAN1 (to the DHCP server) but I'm not sure if the reverse is working i.e. VLAN1 to VLAN2 (reply from DHCP server). Currently the VLAN setup on the switches are as follows: L3 Switch Port 1 & 2 = VLAN1 Untagged, VLAN2 Tagged, VLAN3 Tagged Port 48 = VLAN1 Untagged, VLAN2 Tagged, VLAN3 Tagged L2 Switch Port 1 = VLAN1 Untagged, VLAN2 Tagged, VLAN3 Tagged Port 24 = VLAN1 Untagged, VLAN2 Tagged, VLAN3 Tagged The switches we have are: GSM7352S and GS724TP. Please note that if i statically assign the laptop with a 192 IP, I can ping a VM that is on VLAN2 and vice versa.

I managed to get the DHCP Relay to work by setting the default gateway of the dhcp server to the switch. This seems to be working as long as VLAN Routing is configured. Is there anyway to control access to this i.e. once the client is issued an ip, if the gateway is the switch then the client seems to have unrestricted access to the dhcp server. Is there anyway for the client to be issued with an ip address but have no access to the other subnet/DHCP server?

Hi SCGSGAog, I'm glad that you were able to get it working. :) With regard to your questions, I think you will need to create an access rule that allows the device to contact the server on port 67 for DHCP and then deny all after. Hope it helps. Regards, DaneA NETGEAR Community Team

DHCP Relay with VMWare DHCP Server

12 Replies

SCGSGAog
Aspirant
Apr 07, 2016
Wanted to expand on my configuration but dont seem to be able to edit my original post, hence the reply. Anyway:

DHCP Server (VM)

1 Virtual NIC (10.0.0.1)

3 Scopes for each VLAN:

VLAN1 = 10.0.0.0/255.255.240.0

VLAN2 = 192.168.1.0/255.255.255.0

VLAN3 = 192.168.2.0/255.255.255.0

L3 Switch

Ports 1,2 connects to the Host that has the DHCP VM

Port 48 connects to L2 Switch

L2 Switch

Port 1 connects to Wireless AP

Port 24 connects to L3 Switch

Wireles AP

Connects to L2 Switch

2 WLAN created with 1 on VLAN2 and the other on VLAN3

Assuming the above what needs to be done to enable a computer on the WLAN to get an IP from the DHCP server in the appropriate scope?
- DaneA
  NETGEAR Employee Retired
  Apr 07, 2016
  Hi SCGSGAog,
  
  Welcome to the community! :)
  
  I have not yet encountered to set a DHCP Relay using a VMware DHCP server with the L3 switch. However, let me share this article below and this might help as reference guide:
  
  How do I configure a DHCP L3 relay using the web interface on my managed switch?
  
  Also, here below are the forum links I have found online and these might help as well:
  
  DHCP Relay Netgear managed switches (The GUI method)
  
  Netgear GSM7224v2: Help with DHCP Relay!
  
  Also, what specific model of NETGEAR L3/L2 switch/es are you using? Kindly indicate the current firmware version of the switch/es.
  
  Regards,
  
  DaneA
  
  NETGEAR Community Team
  - SCGSGAog
    Aspirant
    Apr 08, 2016
    Hi,
    
    Thank you.
    
    I've seen those sites before and have based my configuration on them however in regards to the Netgear Howto, the physical configuration is of a physical (from what I can see) dhcp server that is directly connected to the switch (on port 4 with an IP of 10.100.1.1). Our dhcp server is not directly connected as its a virtual server, that being the case there are other virtual servers that will be connecting to the sames port on the L3 switch. Additionally as the APs are connected indirectly via other switches I'm not exactly sure how I would assign IPs to ports.
    
    I have enabled DHCP Relay, DHCP L2 Relay, UDP Relay and I've even configured VLAN Routing (i.e. assigned an IP to VLAN2). After configuring VLAN Routing, I noticed that under DHCP Relay>DHCP Status>Requests Relayed showed that there were requests relayed (previously none) but laptop still not getting IP.
    
    At the moment I think that potentially requests are being relayed from VLAN2 to VLAN1 (to the DHCP server) but I'm not sure if the reverse is working i.e. VLAN1 to VLAN2 (reply from DHCP server).
    
    Currently the VLAN setup on the switches are as follows:
    
    L3 Switch
    
    Port 1 & 2 = VLAN1 Untagged, VLAN2 Tagged, VLAN3 Tagged
    
    Port 48 = VLAN1 Untagged, VLAN2 Tagged, VLAN3 Tagged
    
    L2 Switch
    
    Port 1 = VLAN1 Untagged, VLAN2 Tagged, VLAN3 Tagged
    
    Port 24 = VLAN1 Untagged, VLAN2 Tagged, VLAN3 Tagged
    
    The switches we have are: GSM7352S and GS724TP.
    
    Please note that if i statically assign the laptop with a 192 IP, I can ping a VM that is on VLAN2 and vice versa.

Forum Discussion

DHCP Relay with VMWare DHCP Server

12 Replies

Related Content

LAG Verbindung mit VMWare Server stoppt

Apple "Private Relay" not working

XS728T DHCP relay support?

Nighthawk R6700 v3 router not relaying wifi signal

R6220 DHCP Relay support?

NETGEAR Academy

ProSupport for Business