Linksys BEFSR81 User Manual page 33

B. Open a command prompt.
• For Windows 95, 98, and Me, click Start and choose Run. In the Open
field, type in command. Press the Enter key or click the OK button.
• For Windows NT, 2000, and XP, please click Start and choose Run. In
the Open field, type cmd. Press the Enter key or click the OK button.
C. In the command prompt, type ping 192.168.1.1 and press the Enter key.
• If you get a reply, the computer is communicating with the Router.
• If you do NOT get a reply, please check the cable, and make sure Obtain
an IP address automatically is selected in the TCP/IP settings for your
Ethernet adapter.
D. In the command prompt, type ping followed by your WAN IP address and
press the Enter key. The WAN IP Address can be found in the web inter-
face of the Router. For example, if your WAN IP address is 1.2.3.4, you
would enter ping 1.2.3.4 and press the Enter key.
• If you get a reply, the computer is connected to the Router.
• If you do NOT get a reply, try the ping command from a different com-
puter to verify that your original computer is not the cause of the problem.
E. In the command prompt, type ping www.yahoo.com and press the Enter
key.
• If you get a reply, the computer is connected to the Internet. If you cannot
open a webpage, try the ping command from a different computer to ver-
ify that your original computer is not the cause of the problem.
• If you do NOT get a reply, there may be a problem with the connection.
Try the ping command from a different computer to verify that your orig-
inal computer is not the cause of the problem.
3. I am not getting a WAN IP address with my Internet connection.
A. Refer to "Problem #2, My Internet connection isn't working" to verify that
you are connected.
B. If you need to register the MAC address of your Ethernet adapter with your
ISP, please see "Appendix F: Finding the MAC address and IP Address for
Your Ethernet Adapter." If you need to clone the MAC address of your
Ethernet adapter onto the Router, see the MAC Address Clone section of
"Chapter 6: The Router's Web-based Utility" for details.
C. Make sure that you are using the right WAN settings. Contact your ISP to
see if your WAN connection type is DHCP, Static IP Address, or PPPoE
(commonly used by DSL consumers). Please refer to the Setup section of
"Chapter 6: The Router's Web-based Utility" for details on WAN settings.
D. Make sure that you have the right cable. Check to see if the WAN column
has a solidly lit Link LED.
59
Instant Broadband Series
®
EtherFast Cable/DSL Router with QoS and 8-Port Switch
®
E. Make sure that the cable connecting from your cable or DSL modem is con-
nected to the Router's WAN port. Verify that the Status page of the Router's
web interface shows a valid IP address from your ISP.
F. Turn off the computer, Router, and cable/DSL modem. Wait 30 seconds,
and then turn on the Router, cable/DSL modem, and computer. Check the
Status tab of the Router's web-based utility to see if you get an IP address.
4. I am not able to access the Router's web interface Setup page.
A. Refer to "Problem #2, My Internet connection isn't working" to verify that
your computer is properly connected to the Router.
B. Refer to "Appendix F: 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 #1: I need to set a
static IP address."
D. 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) to work through the Router.
Access the Router's web interface by going to http://192.168.1.1 or the IP
address of the Router, and go to the Advanced => Filter tab. Make sure that
you have IPsec pass-through 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 Router; however, simultaneous IPSec sessions might 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 Router. AH has limitations due to occasional incom-
patibility with the NAT standard.
Change the IP address for the Router 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 Router will have difficulties routing information to
the right location. If you change the Router's IP address to 192.168.2.1, that
should solve the problem. Change the Router's IP address through the Setup tab
of the web interface. If you assigned a static IP address to any computer or net-
work 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.
60