Synology NAS has only one default Gateway field in the GUI for Network, hence in case you want the two lan to have its own gateways then the following will do the trick.
Control Pannel > Network > General Tab
Server Name: NAS
Default Gateway: 192.168.1.1
1. configure the LAN 1 “Manual Configuration”
IP Address 192.168.1.10
subNet Mask 255.255.255.0
2. configure the LAN 2 “Manual Configuration”
IP Address 192.168.2.10
subNet Mask 255.255.255.0
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