In computer networking, link aggregation is the combining (aggregating) of multiple network connections in parallel by any of several methods, in order to increase throughput beyond what a single connection could sustain, to provide redundancy in case one of the links should fail, or both. A link aggregation group (LAG) is the combined collection of physical ports.

Synology NAS supports multi-LAN, allowing you to combine those LAN interfaces using the Link Aggregation technology. Link Aggregation increases the bandwidth of your Synology NAS by aggregating multiple network interfaces and provides traffic failover to maintain network connection in case the connection is down.

Adaptive Load Balancing: This mode optimizes the network traffic received and sent by Synology NAS devices regardless of whether Link Aggregation is enabled or not. To avoid unexpected circumstances, do not enable Link Aggregation even though it is supported.