u/Large-Leopard-725

Can't ping device in VLAN but MAC is visible (Fortigate + Dell + UniFi)

Hey everyone,

I'm dealing with a weird VLAN issue and could use some help.

my topology:
FortiGate → Dell Switch → UniFi Switch

VLANs:

  • VLAN 60 = untagged (PVID 60)
  • VLAN 40 = tagged

Problem:

  • I can see the MAC address of the device on the network
  • But I cannot ping the IP
  • The device should be in VLAN 60

Details

  • Dell port: VLAN 1 tagged, 40 tagged, 60 untagged (PVID 60)
  • UniFi port: default config (untouched)
  • FortiGate is handling routing

What I tested:

  • Ping from FortiGate → no response
  • Sniffer shows traffic reaching the device
  • MAC address is learned correctly on the switch

Questions:

  • Could this be a VLAN tagging mismatch on UniFi?
  • Is it possible the device is receiving traffic but not replying due to wrong VLAN?
  • Any good way to trace the return path?

Feels like a layer 2/3 mismatch, but I’m missing something.

Any ideas would be appreciated 🙏

reddit.com
u/Large-Leopard-725 — 10 days ago

https://preview.redd.it/i2fsrrjzrbzg1.png?width=1286&format=png&auto=webp&s=a8671d5b9feb9f51e4c2f1d32523d9f6800d9674

512 / 5.000

I have an environment with Fortinet → Dell Switch → UniFi Switch (USW) using VLANs (1, 10, 30, 40, 60).

The problem is that I can't ping the UniFi switch. I've already verified that: The USW's MAC address appears on the Dell switch (i.e., physical link OK)

Communication seems to be failing due to VLAN configuration

Current situation: Dell port has: VLAN 1 = tagged VLAN 40 = tagged VLAN 60 = untagged Suspicion: 👉 The USW expects management on untagged VLAN 1, but is receiving untagged VLAN 60, so it's not getting the correct IP address.

reddit.com
u/Large-Leopard-725 — 10 days ago
▲ 2 r/devBR+1 crossposts

Estou fazendo uma aplicação sozinho por enquanto eu desenvolvi boa parte do backend (banco de dados e Api) , começo a desenvolver o frontend quando ? algum full stack pra

me dar uma luz de como conciliar o desenvolvimento do frontend e backend ?

reddit.com
u/Large-Leopard-725 — 11 days ago