試試看
zyxel ->wan-RT-N16(1) ->lan-RT-N16(2)
192.168.1.1 (DHCP)->192.168.2.1(DHCP)->192.168.2.10

n16(1)
internet setup: DHCP

Network setup:
ip address:192.168.2.1
subnet mask:255.255.255.0
DHCP Server:enable

n16(2)
internet setup: DHCP

Network setup:
ip address:192.168.2.10
subnet mask:255.255.255.0
DHCP Server:disable

從n16連上，N16(1)跟N16(2)可以互通
但不能通到zyxel

因為你第二n16-in是接lan，要設定在同一個區段