166 
It is used for ADSL dial-up connections. 
It is the maximum value for the ping command. A packet with a larger size is 
fragmented. 
It is used for DHCP connections. 
It is used for VPN or PPTP connections. 
12.3.2  Change the WAN speed and duplex mode 
To access the configuration page, log in to the web UI of the router, and choose System Settings > 
WAN Settings. 
When the Ethernet cable is intact and connected to the WAN port properly, but Ethernet cable 
disconnected is still shown on the Internet Settings page, you can try to change the Speed to 10 
Mbps FDX or 10 Mbps HDX to solve the problem. Otherwise, keep the default settings.
 
Parameter description 
1000 Mbps auto-
negotiation 
It indicates that the speed and duplex mode are determined through the negotiation 
with the peer port. 
10 Mbps Full Duplex. It indicates that the WAN port is working at the speed of 10 
Mbps, and the port can receive and send data packets at the same time. 
10 Mbps Half Duplex. It indicates that the WAN port is working at the speed of 10 
Mbps, but the port can only receive or send data packets alternately. 
100 Mbps Full Duplex. It indicates that the WAN port is working at the speed of 100 
Mbps, and the port can receive and send data packets at the same time. 
100 Mbps Half Duplex. It indicates that the WAN port is working at the speed of 100