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FortiGate DHCP Relay Silent: diagnose debug application dhcprelay

4 days ago
2 min read

FortiGate network security troubleshooting lab — FortiGate · Techclick CLI troubleshooting lab

New VLAN gets no addresses. The core DHCP server is healthy. FortiGate is the relay.

This is a live-ticket style lesson from Techclick Infosec. You will isolate the fault with CLI first, then prove the fix with one clean packet or log.

What you will be able to do

Name the first CLI command to run on FortiGate for this ticket
Separate the layer that is actually broken from the layer people blame
Apply one scoped fix instead of a global disable
Prove the ticket closed with a session, log, or counter

Quick answer

Relay must see the discover on the client VLAN and forward to the helper IP. dhcprelay debug shows which side is silent.

Why this ticket shows up

Wrong helper IP, missing local-in, or helper in another VDOM drops DHCP without a dramatic log.

Symptoms operators actually see

Clients stay APIPA
Server has no discovers
Other VLANs work
Helper IP recently changed

CLI first — copy this block

Run these on the FortiGate device or console named in the ticket. Do not skip the first show command — it tells you which later command matters.

show system dhcp server
diagnose debug application dhcprelay -1
diagnose debug enable
diagnose ip address list
execute ping <dhcp-server>
get system interface physical

How to read that output

You must see a discover in and a relayed packet out. If only the in-side appears, helper IP or routing is wrong.

Triage order

Confirm the client VLAN interface has the relay
Ping the helper sourced from that interface
Run dhcprelay debug and renew one client
Fix helper IP or policy
Disable debug

Classic traps

What you see	Real cause	Fix
Rebuild the DHCP server	Relay never forwarded	Fix helper
Allow UDP 67 only one way	Relay is bidirectional	Allow return
Add a local DHCP pool	Design is central DHCP	Do not hide the real fault

Proof the ticket is closed

Client gets the correct scope
Debug shows discover and offer
Lease appears on the server

Say this in an interview

APIPA on one VLAN with a healthy DHCP server is a relay problem until dhcprelay proves otherwise.

Need the full vendor lab, mock interview, and production runbooks? Techclick trains Palo Alto, Zscaler, F5, FortiGate, Check Point, Cisco ISE, Azure and routing with live CLI — start at https://www.techclick.in/