Asus RT-AC68R - Manual (Page 60)

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To modify the LAN IP settings:
1. From the navigation panel, go to Advanced Settings > LAN >
LAN IP tab.
2. Modify the IP address and Subnet Mask.
3. When done, click Apply.
4.2.2 DHCP Server
Your wireless router uses DHCP to assign IP addresses
automatically on your network. You can specify the IP address
range and lease time for the clients on your network.
To configure the DHCP server:
1. From the navigation panel, go to Advanced Settings > LAN >
DHCP Server tab.
2. In the Enable the DHCP Server field, tick Yes.