Yeastar S20 provides two 10/100M adaptive RJ45 Ethernet ports. There are 3
Ethernet modes for the system. The default mode is “Single”.
Single: LAN port interface will be used for uplink connection. WAN port is
disabled.
Bridge: LAN port interface will be used for uplink connection. WAN port
interface will be used as bridge for PC connection.
Dual: both ports can be used for uplink connection.