User's Manual

Troubleshooting Procedures
194
SMCD3GNV Wireless Cable Modem Gateway User Manual
Gateway Disconnects from the Internet
If the Gateway has been connected to the Internet for an extended period and holds an IP
address (DHCP lease) for a longer period of time than your ISP allows, it is not uncommon
for the Gateway to disconnect from the Internet. This is normal and does not indicate any
issue with the Gateway.
1. Unplug the power to the Gateway, then reconnect power.
Note: If the Gateway is located where you cannot easily unplug it, you can restart it using the
Restore / Reboot Gateway menu (“Restoring or Rebooting the Gateway” on page 98). If your
DHCP lease time seems to be extremely short, contact your ISP to see if there are other
issues on the network. You can reconfigure the Gateway’s lease time using the Local IP
Configuration menu (see “Viewing and Editing Your Local IP Configuration” on page 47).
2. Connect a computer to one of the Gateway’s LAN ports.
3. Restart your computer.
4. Reset the Gateway to its factory default settings using either the Reset button (see “Using
the Reset Button” on page 17) or the Restore / Reboot Gateway menu (see “Restoring or
Rebooting the Gateway” on page 98).
Note: This step removes all overrides made to the Gateway’s default settings and returns the
Gateway to its original factory default settings.
In certain network scenarios, it may be helpful to turn off all the equipment on your network,
and then turn the equipment all back on. Leaving some devices unplugged for up to five
minutes can also help.
If the disconnections are limited to wired clients only
Check your NIC settings and all cable routing, connections, and power supplies.
If the disconnections are limited to wireless clients only
Focus on factors that affect wireless clients, such as:
 Network selection and security
 Hardware access control
 Client TCP/IP settings
 Signal strength
 Sources of interference