How ordinary load balancing works
A multi-WAN router commonly assigns different network sessions to different Internet links. Web browsing and downloads may be distributed effectively, but one RTMP session can remain pinned to one WAN. If that WAN fails, the session breaks and must reconnect.
How stream-oriented bonding differs
Bonding is designed to use several local links within one managed streaming path. StarBonding splits and transports the outgoing media through active connections, then reconstructs and forwards it through the server side. The encoder continues sending to one local RTMP endpoint.
Failover is not aggregation
A router that switches to a backup WAN after failure provides failover, not simultaneous bonded contribution. It may still be useful for general office traffic, but the public IP and route change can interrupt an established stream. Check the actual behavior rather than relying on the label multi-WAN.
Choose based on the workload
Use conventional load balancing for many independent sessions and general traffic. Use stream-oriented bonding when one live upload must use multiple variable connections and remain observable at link level. The two approaches can coexist when configured carefully.