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Appendix A: Troubleshooting
Common Problems and Solutions
ADSL Gateway with 4-Port Switch
4. I am not able to access the Setup page of the Gateway’s web-based utility.
• Refer to “Problem #2, I want to test my Internet connection” to verify that your computer is properly
connected to the Gateway.
1. Refer to “Appendix C: 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.
2. Set a static IP address on your system; refer to “Problem #1: I need to set a static IP address.”
3. Refer to “Problem #10: I need to remove the proxy settings or the dial-up pop-up window (for PPPoE
users).”
5. I can’t get my Virtual Private Network (VPN) working through the Gateway.
Access the Gateway’s web interface by going to http://192.168.1.1 or the IP address of the Gateway, and go
to the Security tab. Make sure you have IPsec passthrough and/or PPTP pass-through enabled.
• 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 Gateway; 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
Gateway. AH has limitations due to occasional incompatibility with the NAT standard.
• Change the IP address for the Gateway 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 192.168.1.X (X is a
number from 1 to 254) and your local LAN IP address is 192.168.1.X (X is the same number used in the
VPN IP address), the Gateway will have difficulties routing information to the right location. If you change
the Gateway’s IP address to 192.168.2.1, that should solve the problem. Change the Gateway’s IP address
through the Setup tab of the web interface.
• 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 #7, I need to set up online game hosting or use other Internet applications” for
details.
• Check the Linksys website for more information at www.linksys.com/international or
www.linksys/support (English only).