Trouble accessing the internet after configuring the WAN (Internet) port?

Cable Modem(s) Troubleshooting

1. If you use a cable modem you will need to reset the modem cache so it allows the Zyxel router to establish the internet connection.  To reset the cache you can:
• Press the RESET button on the modem and hold it down for 15 seconds. (If there is a reset button available)
• Call your ISP (Internet Service Provider) and have them reset your connection.
• Power down the modem completely (if the modem has a battery backup you will need to remove the battery first) for 5 minutes.
2. If you have a modem/router combination, please call your service provider and ask them to BRIDGE the device so it only functions as a modem.  If the ISP cannot bridge or refuses to bridge the modem, change the Zyxel routers LAN IP to clear any IP conflict between the modem/router and Zyxel router.
• Open a web browser and access the router's Web Interface (WebUI).
• Change the default IP (192.168.1.1) to something difference, such as 192.168.100.1, and the DHCP Server start IP address so it matches the new IP scheme.
• Save the settings.
3. Bypass the router and/or any other networking equipment and connect your computer directly to the modem.  This is to verify that the modem still works and is online.  It will also verify that the cable (Ethernet) used to connect between the modem and router is OK (functional).  If there is no internet:
• Restart/Reboot the modem.
• Contact your ISP to reset the connection or run further troubleshooting/diagnostics on the service end.
• Swap out the modem if faulty.  This will be determined by the ISP's diagnostics of the connection.
• Update modem software (if possible).  Most modems are updated directly by the ISP, in which case they will need to be contacted to verify the modem software is up to date.
4. Place a switch between the modem and router if possible.  If there is an interoperability problem between the modem chipset and the Zyxel router chipset, these devices will not communicate properly amongst themselves.  Placing a switch between the two may clear this interoperability issue as the chipsets will not communicate directly with each other.

xDSL Modem(s) Troubleshooting

1. Most xDSL modems are modem/router combination devices, it is highly recommended to contact the ISP (Internet Service Provider) and have them BRIDGE the device.
• Once the modem is bridge you will need to find out from your service provider if the connection type is "PPPoE" or "Ethernet".  If the connection is Ethernet all you need to do is make sure the modem and router are connected and power OFF the Zyxel router to 10 seconds and power back ON.
• If the connection type is PPPoE, obtain the username and password credentials for the PPPoE account.
• To configure the PPPoE credentials on the Zyxel router you must first access the Web Interface (WebUI).
• Access the WAN/Internet menu and change the connection type to use PPPoE (PPP over Ethernet) instead of the default "Ethernet" option.
• Enter the PPPoE username and password credentials and save the settings.
2. The most commonly used IP address for xDSL modem/routers is 192.168.1.x, this is also the IP address used by the Zyxel routers LAN.  This will create an IP conflict and internet traffic may not work.  In this case it is a good idea to change the LAN IP of the ZyWALL router to eliminate the conflict, if the modem cannot be set to a BRIDGE state.  To change the LAN IP:
• Open a web browser and access the router's Web Interface (WebUI).
• Access the LAN settings or DHCP Server settings on the Zyxel router and change the IP address from the default 192.168.1.1 to something different, like 192.168.100.1
3. Bypass the router and/or any other networking equipment and connect your computer directly to the modem.  This is to verify that the modem still works and is online.  It will also verify that the cable (Ethernet) used to connect between the modem and router is OK (functional).  If there is no internet:
• Restart/Reboot the modem.
• Contact your ISP to reset the connection or run further troubleshooting/diagnostics on the service end.
• Swap out the modem if faulty.  This will be determined by the ISP's diagnostics of the connection.
• Update modem software (if possible).  Most modems are updated directly by the ISP, in which case they will need to be contacted to verify the modem software is up to date.
4. Place a switch between the modem and router if possible.  If there is an interoperability problem between the modem chipset and the Zyxel router chipset, these devices will not communicate properly amongst themselves.  Placing a switch between the two may clear this interoperability issue as the chipsets will not communicate directly with each other

Testing the connection (PING/ICMP)

1. Open a command prompt window (Windows) or terminal client (Linux, Mac OS) and send a PING/ICMP request to www.google.com.
2. Ping to Google fails:
• If the ping test to www.google.com fails, try pinging 8.8.8.8
3. Ping to 8.8.8.8 fails:
• If both pings fail, check the IP settings on your computer.  Make sure the computer has obtained an IP address within the Zyxel routers IP scheme.  The default IP scheme is 192.168.1.X
• Verify that the router has obtained an IP address on the WAN/Internet port.  This involves logging in to the Zyxel routers WebUI to view the connections status.
• If the IP address on the WAN (Internet) port conflicts with the LAN port, change the LAN IP scheme to something like 192.168.100.1.
• Once you have verified the WAN and your computer's IP settings, ping 8.8.8.8 again.
4. Ping to 8.8.8.8 works but ping to www.google.com fails:
• Check your computer's IP settings to see what it received for DNS.  If the computer does not have valid DNS servers, it cannot resolve domain names. 
• - On Windows open command prompt and type ipconfig /all to get the info.
• - On Mac OS open a terminal window and type cat /etc/resolv.conf to view the DNS server settings.
• - On Linux open a terminal window and type nmcli dev list | grep DNS or cat /etc/resolv.conf (depending on Linux distro) to view the DNS settings.
• If there is nothing under the DNS server, check the DHCP server to make sure there are DNS servers configured.  This setting can be different depending on router model and firmware/software, check the device manual to find out where the DNS setup is located on the Zyxel router.
• If the DNS server is pointing to the Zyxel router (192.168.1.1 for example) you need to make sure there are DNS entries programed for the system (hardware).  If your internet service is DHCP the router would have automatically obtained the DNS server settings from your ISP.  If you have a static IP account with your ISP, the DNS servers need to be entered manually into the Zyxel router, check your router's user manual to find out where the DNS setup menu is located.  Check with your ISP to find out what DNS servers you should be using if you do not currently have this info.
  Note:  You may use public DNS servers such as Google's DNS servers, but, it is highly recommended to use DNS servers close to your area.  The further away the public DNS server is from your location the longer it will take to resolve and load websites.
• Refresh/Renew the computer's IP settings and try pinging www.google.com again.
  
5. If you can ping www.google.com and 8.8.8.8 you have established a successful internet connection.

Testing the connection (Browser)

1. Can't open any Web Sites:
• Follow the guide to test the connection using PING/ICMP first.
• If the PING/ICMP test show an internet connection is available check your computer's internet settings to make sure it is not using a proxy:

• Windows:

• Open the Run dialog. You can access this by pressing the Windows + R keys on the keyboard.
  
• Type "inetcpl.cpl" and click the OK button or hit the Enter/Return key.
  
• Click the Connections tab, press the "LAN Settings" button and make sure the Proxy Server is not enabled, "Automatically detect settings" should be the only option enabled.
  

• Mac OS X:

• Open System Preferences → Network, select an interface (Ethernet, Wi-Fi, ect.) and click the "Advanced" button.  Click on the Proxies tab and make sure all the proxy options are unchecked.
  

• Linux: (the information provided below may not work on all Linux distros)

• Open a Terminal window and type gconftool -R /system/proxy, if there is no proxy configuration you will receive a printout like the screenshot below.
  
2. Disable your computer's firewall and/or internet security software (if applicable) and try again.
3. Try with different web browser(s).
4. If you have multiple devices please check to see if all devices are experiencing the same problem.
5. Disable the firewall on the router if necessary.
6. Depending on the router make and model it may be necessary to manually create a route to push internet traffic through the internet port.  (Zyxel routers have routes entered automatically to allow for internet traffic)