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Troubleshooting Procedures
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SMCD3GNV Wireless Cable Modem Gateway User Manual
Can you connect to the Internet directly?
5. Set up a computer to connect to the Internet directly, without using the Gateway.
6. If you cannot connect to the Internet without the Gateway, contact your ISP for assistance.
Slow Web Browsing
If you experience slow Web browsing with the Gateway:
1. Check for possible intrusion by spyware and viruses.
2. Clear browser settings and cache (refer to the documentation for your Web browser).
3. Stop other programs running in the background that are consuming bandwidth.
4. A specific site may be suffering from server issues, try another site.
5. Update the Gateway firmware.
Unable to Configure Port Forwarding
If you are not able to configure port forwarding for software applications, external servers or
gaming:

Ascertain the port(s) that the application or game calls for.

Some ISPs block ports, such as ports 20, 21, and 80. Check with ISP to confirm whether
it is blocking ports.

Reserve IP addresses for the computers to ensure they receive the appropriate IP
address(es) for the service created (see “Working with Connected Devices” on page 64.

Disable firewalls and stateful packet inspection (SPI) applications.

Create a dynamic DNS (DynDNS) account for dynamic IP addresses from the ISP.

Update the Gateway firmware.
Unable to Use Pass-thru VPN
If VPN pass-through is not working:

You may have to forward ports (see “Adding a Port Forwarding Rule” on page 85). Ports
50, 51, 500, 1701 and 1723 are standard VPN ports.

Update the Gateway firmware.
Gateway is Not Passing DHCP Address to a computer
If the Gateway is not passing DHCP addresses to a computer over a wired or wireless
connection:
1. Be sure computer IP is not statically set already.