[ATP/FLEX] When WAN1 comes back online, why does the traffic continue to stay on WAN2?

Zyxel_Stanley

Question:

I have configured Weight Round Robin setting from Nebula firewall and also setup WAN2 interface as Backup interface. But why the traffic still keep on WAN2 interface even the WAN1 interface has fallback completely?

Answer:

The firewall will keep the old session on WAN2 interface until it has transmitted completely. To keep old session could prevent client needs to re-initial the session again if it is not transmitted completely. However the new session will pass through by WAN1 interface without problem.