Hi all,

I’m observing a reproducible issue with client detection in Omada SDN when a single device (in my case a NAS) is configured with multiple IP addresses across different VLANs.

Setup:

• Omada SDN Controller
• 3 VLANs:
  • VLAN 0 (Default): 192.168.0.0/24
  • VLAN 10(X) : 192.168.10.0/24
  • VLAN 20(Y) : 192.168.20.0/24
• NAS with interfaces/IPs in all three networks:
  • 192.168.0.2
  • 192.168.10.2
  • 192.168.20.2
• NAS connected via trunk port (tagged VLAN 10/20, untagged default / Native=Default

Observed behavior:
In the Omada Controller, the NAS is constantly “reconnecting” and switching between networks:

Example log pattern:

• Connected to Default (192.168.0.2)
• Connected to X (192.168.20.2)
• Connected to Y (192.168.10.2)
  → repeating every few minutes

This creates:

• Continuous “connect/disconnect” events
• Incorrect or unstable network assignment in the UI

Important:

• Network connectivity itself is stable
• No packet loss or real disconnects
• No STP events or MAC flapping on switch ports
• Same MAC address is used across VLAN interfaces (expected behavior for this device)

Expected behavior:

• Either:
  • The client should be shown once with multiple IPs across VLANs, or
  • Separate logical entries per VLAN/IP should be stable
• No continuous reconnect events if the physical link is stable

Actual behavior:

• Controller seems to reassign the same MAC to different VLANs repeatedly
• Appears as frequent reconnects (“flapping”), although no real link change occurs

Log
04-26-2026 09:25:24.887 INFO [client-inform-work-group-1] [] c.t.s.o.c.d.m.h.k(): Need override old client history for client 00-E0-4C-68-00-A1 with lastSeen 1777188295217
04-26-2026 09:24:54.897 INFO [client-inform-work-group-0] [] c.t.s.o.c.d.m.h.k(): Need override old client history for client 00-E0-4C-68-00-A1 with lastSeen 1777188265197
04-26-2026 09:27:54.968 INFO [client-inform-work-group-0] [] c.t.s.o.c.d.m.h.k(): Need override old client history for client 00-E0-4C-68-00-A1 with lastSeen 1777188445277
04-26-2026 09:28:24.986 INFO [client-inform-work-group-1] [] c.t.s.o.c.d.m.h.k(): Need override old client history for client 00-E0-4C-68-00-A1 with lastSeen 1777188475297