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Appendix A: Troubleshooting
Common Problems and Solutions
IP Telephony System
12.I am not able to access the System’s Web-based Utility Setup page.
A. Refer to “Problem #10, I want to test my Internet connection” to verify that your computer is properly
connected to the System.
B. Refer to “Appendix E: Finding the MAC Address and IP Address for Your Ethernet Adapter” to verify that
your computer has an IP Address, Subnet Mask, Gateway, and DNS.
C. Set a static IP address on your system; refer to “Problem #9: I need to set a static IP address on a PC.”
D. Refer to “Problem #17: I am a PPPoE user, and I need to remove the proxy settings or the dial-up pop-up
window.”
13.I can’t get my Virtual Private Network (VPN) to work through the System.
VPNs that use IPSec with the ESP (Encapsulation Security Payload known as protocol 50) authentication will
work fine. At least one IPSec session will work through the System; however, simultaneous IPSec sessions
may be possible, depending on the specifics of your VPNs.
VPNs that use IPSec and AH (Authentication Header known as protocol 51) are incompatible with the System.
AH has limitations due to occasional incompatibility with the NAT standard.
Change the IP address for the System to another subnet to avoid a conflict between the VPN IP address and
your local IP address. For example, if your VPN server assigns an IP address 192.168.0.X (X is a number from
1 to 254) and your local LAN IP address is 192.168.0.X (X is the same number used in the VPN IP address), the
System will have difficulties routing information to the right location. If you change the System’s IP address to
192.168.2.1, that should solve the problem. Change the System’s IP address through the Router - LAN Setup
tab of the Web-based Utility. If you assigned a static IP address to any computer or network device on the
network, you need to change its IP address accordingly to 192.168.2.Y (Y being any number from 1 to 254).
Note that each IP address must be unique within the network.
Your VPN may require port 500/UDP packets to be passed to the computer that is connecting to the IPSec
server. Refer to “Problem #15, I need to set up online game hosting or use other Internet applications” for
details. Check the Linksys website at www.linksys.com for more information.
14.I need to set up a server behind my System.
To use a server like a web, ftp, or mail server, you need to know the respective port numbers they are using.
For example, port 80 (HTTP) is used for web; port 21 (FTP) is used for FTP, and port 25 (SMTP outgoing) and
port 110 (POP3 incoming) are used for the mail server. You can get more information by viewing the
documentation provided with the server you installed. Follow these steps to set up port forwarding through
the System’s Web-based Utility. We will be setting up web, ftp, and mail servers.
A. Access the System’s Web-based Utility by going to http://192.168.0.1 or the IP address of the System.
Go to the Router => Application tab.
B. Select yes from the Enable drop-down menu.
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