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52
Appendix A: Troubleshooting
Common Problems and Solutions
4-Port Gigabit Security Router with VPN
15.I can't access my email, web, or VPN, or I am getting corrupted data from the Internet.
The Maximum Transmission Unit (MTU) setting may need to be adjusted. By default, the MTU is set at 1500.
For most DSL users, it is strongly recommended to use MTU 1492. If you are having some difficulties, perform
the following steps:
A.
To connect to the Router, go to the web browser, and enter
or the IP address of the
Router.
B.
Enter the password, if asked. (The default password is
admin
.)
C.
Go to Firewall => General tab.
D.
Look for the MTU option, and select
Enable
. In the
Size
field, enter 1492.
E.
Click the
Save Settings
button to continue.
If your difficulties continue, change the Size to different values. Try this list of values, one value at a time, in
this order, until your problem is solved:
1462
1400
1362
1300
16.I need to use port triggering.
Port triggering looks at the outgoing port services used and will trigger the Router to open a specific port,
depending on which port an Internet application uses. Follow these steps:
A.
To connect to the Router, go to the web browser, and enter
or the IP address of the
Router.
B.
Enter the password, if asked. (The default password is
admin
.)
C.
Click the
Setup
=>
Forwarding
tab.
D.
Enter any name you want to use for the Application Name.
E.
Enter the Start and End Ports of the Triggered Port Range. Check with your Internet application provider
for more information on which outgoing port services it is using.
F.
Enter the Start and End Ports of the Forwarded Port Range. Check with your Internet application provider
for more information on which incoming port services are required by the Internet application.
Once completed with the configuration, click the
Save Settings
button.
17.When I enter a URL or IP address, I get a time-out error or am prompted to retry.
•
Check if other PCs work. If they do, ensure that your workstation’s IP settings are correct (IP Address,
Subnet Mask, Default Gateway, and DNS). Restart the computer that is having a problem.
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53
Appendix A: Troubleshooting
Frequently Asked Questions
4-Port Gigabit Security Router with VPN
•
If the PCs are configured correctly, but still not working, check the Router. Ensure that it is connected and
powered on. Connect to it and check its settings. (If you cannot connect to it, check the LAN and power
connections.)
•
If the Router is configured correctly, check your Internet connection (DSL/cable modem, etc.) to see if it is
working correctly. You can remove the Router to verify a direct connection.
•
Manually configure the TCP/IP with a DNS address provided by your ISP.
•
Make sure that your browser is set to connect directly and that any dial-up is disabled. For Internet
Explorer, click
Tools
,
Internet Options
, and then the
Connection
tab. Make sure that Internet Explorer is
set to
Never dial a connection
. For Netscape Navigator, click
Edit
,
Preferences
,
Advanced
, and
Proxy
.
Make sure that Netscape Navigator is set to
Direct connection to the Internet
.
18.I’m trying to access the Router’s Web-based Utility, but I do not see the login screen. Instead, I see a
screen saying, “404 Forbidden.”
If you are using Windows Explorer, perform the following steps until you see the Web-based Utility’s login
screen (Netscape Navigator will require similar steps):
A.
Click
File
. Make sure
Work Offline
is NOT checked.
B.
Press
CTRL + F5
. This is a hard refresh, which will force Windows Explorer to load new webpages, not
cached ones.
C.
Click
Tools
. Click
Internet Options
. Click the
Security
tab. Click the
Default level
button. Make sure the
security level is Medium or lower. Then click the
OK
button.
Frequently Asked Questions
What is the maximum number of IP addresses that the Router will support?
The Router will support up to 253 IP addresses.
Is IPSec Passthrough supported by the Router?
Yes, enable or disable IPSec Passthrough on the VPN => VPN Pass Through tab.
Where is the Router installed on the network?
In a typical environment, the Router is installed between the cable/DSL modem and the LAN. Plug the Router into
the cable/DSL modem’s Ethernet port.
Does the Router support IPX or AppleTalk?
No. TCP/IP is the only protocol standard for the Internet and has become the global standard for communications.
IPX, a NetWare communications protocol used only to route messages from one node to another, and AppleTalk, a
communications protocol used on Apple and Macintosh networks, can be used for LAN to LAN connections, but
those protocols cannot connect from the Internet to the LAN.
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54
Appendix A: Troubleshooting
Frequently Asked Questions
4-Port Gigabit Security Router with VPN
What is Network Address Translation and what is it used for?
Network Address Translation (NAT) translates multiple IP addresses on the private LAN to one public address that
is sent out to the Internet. This adds a level of security since the address of a PC connected to the private LAN is
never transmitted on the Internet. Furthermore, NAT allows the Router to be used with low cost Internet accounts,
such as DSL or cable modems, when only one TCP/IP address is provided by the ISP. The user may have many
private addresses behind this single address provided by the ISP.
Does the Router support any operating system other than Windows 98, Millennium, 2000, or XP?
Yes, but Linksys does not, at this time, provide technical support for setup, configuration or troubleshooting of
any non-Windows operating systems.
Does the Router support ICQ send file?
Yes, with the following fix: click
ICQ menu
=>
preference
=>
connections
tab=>, and check
I am behind a
firewall or proxy
. Then set the firewall time-out to 80 seconds in the firewall setting. The Internet user can then
send a file to a user behind the Router.
I set up an Unreal Tournament Server, but others on the LAN cannot join. What do I need to do?
If you have a dedicated Unreal Tournament server running, you need to create a static IP for each of the LAN
computers and forward ports 7777, 7778, 7779, 7780, 7781, and 27900 to the IP address of the server. You can
also use a port forwarding range of 7777 to 27900. If you want to use the UT Server Admin, forward another port
(8080 usually works well but is used for remote admin. You may have to disable this.), and then in the
[UWeb.WebServer] section of the server.ini file, set the ListenPort to 8080 (to match the mapped port above) and
ServerName to the IP assigned to the Router from your ISP.
Can multiple gamers on the LAN get on one game server and play simultaneously with just one public IP
address?
It depends on which network game or what kind of game server you are using. For example, Unreal Tournament
supports multi-login with one public IP.
How do I get
Half-Life: Team Fortress
to work with the Router?
The default client port for Half-Life is 27005. The computers on your LAN need to have “+clientport 2700x” added
to the HL shortcut command line; the x would be 6, 7, 8, and on up. This lets multiple computers connect to the
same server. One problem: Version 1.0.1.6 won’t let multiple computers with the same CD key connect at the
same time, even if on the same LAN (not a problem with 1.0.1.3). As far as hosting games, the HL server does not
need to be in the DMZ. Just forward port 27015 to the local IP address of the server computer.
How can I block corrupted FTP downloads?
If you are experiencing corrupted files when you download a file with your FTP client, try using another FTP
program.
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55
Appendix A: Troubleshooting
Frequently Asked Questions
4-Port Gigabit Security Router with VPN
The web page hangs; downloads are corrupt, or nothing but junk characters are being displayed on the
screen. What do I need to do?
Force your Ethernet adapter to 10Mbps or half duplex mode, and turn off the “Auto-negotiate” feature of your
Ethernet adapter as a temporary measure. (Please look at the Network Control Panel in your Ethernet adapter’s
Advanced Properties tab.) Make sure that your proxy setting is disabled in the browser. Check our website at
www.linksys.com
for more information.
If all else fails in the installation, what can I do?
Reset the Router by holding down the Reset button for ten seconds. Reset your cable or DSL modem by powering
the unit off and then on. Obtain and flash the latest firmware release that is readily available on the Linksys
website,
www.linksys.com
.
How can I be notified of new Router firmware upgrades?
All Linksys firmware upgrades are posted on the Linksys website at
www.linksys.com
, where they can be
downloaded for free. The Router’s firmware can be upgraded using the Web-based Utility. If the Router’s Internet
connection is working well, there is no need to download a newer firmware version, unless that version contains
new features that you would like to use. Downloading a more current version of Router firmware will not enhance
the quality or speed of your Internet connection, and may disrupt your current connection stability.
Will the Router function in a Macintosh environment?
Yes, but the Router’s setup pages are accessible only through Internet Explorer 5.0 or Netscape Navigator 5.0 or
higher for Macintosh.
I am not able to get the web configuration screen for the Router. What can I do?
You may have to remove the proxy settings on your Internet browser, e.g., Netscape Navigator or Internet
Explorer. Or remove the dial-up settings on your browser. Check with your browser documentation, and make
sure that your browser is set to connect directly and that any dial-up is disabled. Make sure that your browser is
set to connect directly and that any dial-up is disabled. For Internet Explorer, click
Tools
,
Internet Options
, and
then the
Connection
tab. Make sure that Internet Explorer is set to
Never dial a connection
. For Netscape
Navigator, click
Edit
,
Preferences
,
Advanced
, and
Proxy
. Make sure that Netscape Navigator is set to
Direct
connection to the Internet
.
What is DMZ Hosting?
Demilitarized Zone (DMZ) allows one IP address (computer) to be exposed to the Internet. Some applications
require multiple TCP/IP ports to be open. It is recommended that you set your computer with a static IP if you
want to use DMZ Hosting. To get the LAN IP address, see “Appendix E: Finding the MAC Address and IP Address
for Your Ethernet Adapter.”
If DMZ Hosting is used, does the exposed user share the public IP with the Router?
No.
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56
Appendix A: Troubleshooting
Frequently Asked Questions
4-Port Gigabit Security Router with VPN
Does the Router pass PPTP packets or actively route PPTP sessions?
The Router allows PPTP packets to pass through.
Is the Router cross-platform compatible?
Any platform that supports Ethernet and TCP/IP is compatible with the Router.
How many ports can be simultaneously forwarded?
Theoretically, the Router can establish 4,000 sessions at the same time, but you can only forward 30 ranges of
ports.
Does the Router replace a modem? Is there a cable or DSL modem in the Router?
No, this version of the Router must work in conjunction with a cable or DSL modem.
Which modems are compatible with the Router?
The Router is compatible with virtually any cable or DSL modem that supports Ethernet.
What is the maximum number of VPN sessions allowed by the Router?
The maximum number depends on many factors. At least one IPSec session will work through the Router;
however, simultaneous IPSec sessions may be possible, depending on the specifics of your VPNs.
How can I check whether I have static or DHCP IP addresses?
Ask your ISP to find out.
How do I get mIRC to work with the Router?
Under the Setup => Forwarding tab, set port forwarding to
113
for the PC on which you are using mIRC.
If your questions are not addressed here, refer to the Linksys website,
www.linksys.com
.
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