DHCP Relay Not Working

Helmi Salim Lv1Posted 14 Aug 2024 08:18

Last edited by Helmi Salim 14 Aug 2024 08:20.

Hi Sifoorian,
I have configured multiple VLANs within the NGAF and set up inter-VLAN routing policies that allow internal users to access the server. The DHCP server is configured for the multiple VLAN segments, and I’ve also set up a DHCP relay on the NGAF pointing to this server. However, the clients are not receiving IP addresses from the DHCP server.

Maybe It's just a basic configuration that I may have overlooked.

Please help. Thank you
DHCP Relay.jpg

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fuadmahbubun Lv2Posted 15 Aug 2024 16:17
  
make sure ngaf is able ping to dhcp server, and make route to dhcp server.
could you share what device are you using for dhcp server?
CLELUQMAN Lv3Posted 15 Aug 2024 16:45
  
Hi bro .
Can share screenshot for
Network>DHCP>DHCP Options
Zonger Lv5Posted 29 Aug 2024 21:22
  
You need to ensure that the DHCP relay agent on the NGAF is correctly configured to forward DHCP requests from the internal clients to the DHCP server. Check that the "Relay" option is enabled for the correct VLANs and that the "Server IP" field is set to the IP address of the DHCP server.

Moreover, verify that the DHCP server is configured to allow DHCP requests from the internal clients' IP addresses. You can also check the NGAF's logs for any errors or warnings related to DHCP relay. Make sure that the clients' network cards are configured to obtain an IP address automatically (DHCP) and that they are connected to the correct VLAN.
Sheikh_Shani Lv2Posted 31 Aug 2024 13:11
  
Last edited by Sheikh_Shani 31 Aug 2024 13:14.

Hello Dear

Check the following steps to troubleshoot the DHCP issue:

1. DHCP Relay Configuration: Make sure the DHCP relay on the NGAF is correctly pointing to the right IP address of the DHCP server.

2. VLAN Configuration: Verify that each VLAN is properly configured and is allowing traffic to and from the DHCP server.

3. Firewall Rules: Ensure that there are no firewall rules blocking DHCP requests (ports 67 and 68).

4. Client Configuration: Confirm that the clients are set to obtain an IP address automatically.

5. DHCP Server Status: Check that the DHCP server is running and has available IP addresses to lease out.

6. Network Connectivity: Ensure that clients can reach the DHCP server. You can test this with a ping or other basic networking commands.

7. Logs and Monitoring: Look at the logs on both the NGAF and the DHCP server to see if there are any error messages or clues.

Going through these points should help you find the missing configuration.

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