ZyXEL Communications P-2900-4HB - Manual (Page 89)

P-2900-4HB User’s Guide
89
C
H A P T E R
1 2
Troubleshooting
12.1 Overview
This chapter offers some suggestions for solving problems you might encounter.
None of the LEDs turn on when you turn the power on.
• Make sure that you use the included power adapter to connect to the ZyXEL
Device and that it is plugged into an appropriate power source.
• Check all cable connections. If the LEDs still do not turn on, you may have a
hardware problem. In this case, you should contact your local vendor.
Cannot access the Internet.
• Check the condition of the coaxial cable connected to the back of the cable
modem. If the cable looks to be in poor condition, replace it.
• Check with your cable service provider if one of the PWR, DS and US LEDs is
not steady on.
• Check with your cable service provider if the ONLINE LED is off or blinking
slowly.
• Make sure your computer is configured correctly for TCP/IP networking(see
Setting Up Your Computer’s IP Address in the Quick Start Guide).
• Make sure your computer can communicate with the ZyXEL Device (either
through the LAN or the USB port). Use ping to check the connectivity. If you
cannot ping to the ZyXEL Device, do the following:
• Use the arp -d command to delete the existing Address Resolution Protocol
(ARP) table. Then try to ping to the ZyXEL Device again.
• If you want your computer to use a private IP address, make sure your
computer is configured as the same network as the ZyXEL Device’s LAN.
• If you want your computer to use a public IP address, make sure it is in the
same network as one of the ZyXEL Device’s WAN static IP.