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111
Appendix A: Troubleshooting
Frequently Asked Questions
Wireless-G Router for 3G/UMTS Broadband
3G/UMTS
The 3G/UMTS LED flashes as the Router connects to the mobile network. It is solidly lit when
the connection is established. The LED lights up blue if the Router connects to a
HSDPA/3G/UMTS network. The LED lights up green if the Router connects to a GPRS network.
If the LED quickly flashes, alternating between blue and green, and the Router does not have a
connection to the mobile network, then either the Router’s PIN code is incorrect, or there is no
Vodafone Mobile Connect HSDPA/3G/UMTS data or SIM card inserted when you push the
3G/UMTS Connect/Disconnect button.
Internet
This green LED will be solidly lit when the Router has an active connection through the Internet
port. The LED flashes when there is network traffic passing through the Internet connection.
What data cards are supported?
Remove the Vodafone Mobile Connect Card from the
Router, and then look on the back of the card.
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112
Appendix A: Troubleshooting
Frequently Asked Questions
Wireless-G Router for 3G/UMTS Broadband
How do I know which mobile network I am using?
Log onto the Router via the web-based utility at
. The username and password should be
admin
unless you have changed them. Click the
Status
tab, and then click the
3G/UMTS
tab. In the Mobile
Network Status section, on the Network Name line, you will see the name of the network you are currently using.
The connection to the mobile network drops or frequently changes from HSDPA/3G/UMTS to GPRS. How
do I control this?
Log onto the Router via the web-based utility at
. On the first screen you see, the
Basic Setup
screen, there are three Service options listed near the top of the screen. You should select the one that is
appropriate for your location and preferences.
HSPDA/3G/UMTS
Preferred
(recommended)
The Vodafone Mobile Connect Card will use the HSDPA/3G/UMTS mobile network when it is
available. When the signal strength from the GPRS network is significantly stronger than the
HSDPA/3G/UMTS signal, the Vodafone Mobile Connect Card will use the GPRS network. This
could result in a card changing networks frequently in areas of mixed coverage.
HSPDA/3G/UMTS
Only
The Vodafone Mobile Connect Card will only use the HSDPA/3G/UMTS mobile network. It will
not connect to the GPRS network. You should use this option if you want to prevent the card
from frequently changing networks. However, if there is no HSDPA/3G/UMTS mobile network
coverage, then the card will not be able to connect to the network.
GPRS Only
The Vodafone Mobile Connect Card will use the GPRS mobile network. It will not connect to the
HSDPA/3G/UMTS network. You should use this option if you want to prevent the card from
frequently changing networks. However, if there is no GPRS mobile network coverage, the card
will not be able to connect to the network.
Whom should I call if there is a question or problem?
For technical support regarding the card, contact your reseller. If you have questions about your bill, contact
Vodafone. (For Vodafone contact information, refer to “Appendix J: Contact Information”.)
If your questions about the Router are not addressed here, refer to the Linksys website,
www.linksys.com/international.
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113
Appendix B: Wireless Security
Security Precautions
Wireless-G Router for 3G/UMTS Broadband
Appendix B: Wireless Security
Linksys wants to make wireless networking as safe and easy for you as possible. The current generation of
Linksys products provide several network security features, but they require specific action on your part for
implementation. So, keep the following in mind whenever you are setting up or using your wireless network.
Security Precautions
The following is a complete list of security precautions to take (at least steps 1 through 5 should be followed):
1.
Change the default SSID.
2.
Disable SSID Broadcast.
3.
Change the default password for the Administrator account.
4.
Enable MAC Address Filtering.
5.
Change the SSID periodically.
6.
Use the highest encryption algorithm possible. Use WPA if it is available. Please note that this may reduce
your network performance.
7.
Change the WEP encryption keys periodically.
For information on implementing these security features, refer to “Chapter 8: Configuring the Wireless-G Router
for 3G/UMTS Broadband.”
Security Threats Facing Wireless Networks
Wireless networks are easy to find. Hackers know that in order to join a wireless network, wireless networking
products first listen for “beacon messages”. These messages can be easily decrypted and contain much of the
network’s information, such as the network’s SSID (Service Set Identifier). Here are the steps you can take:
Change the administrator’s password regularly.
With every wireless networking device you use, keep in mind
that network settings (SSID, WEP keys, etc.) are stored in its firmware. Your network administrator is the only
IMPORTANT:
Linksys strongly recommends that you enable wireless security on your wireless
network. Otherwise, unauthorised users may be able to access the Internet using your service and
incur additional charges. You are liable for any and all additional charges from your service provider.
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Appendix B: Wireless Security
Security Threats Facing Wireless Networks
Wireless-G Router for 3G/UMTS Broadband
person who can change network settings. If a hacker gets a hold of the administrator’s password, he, too, can
change those settings. So, make it harder for a hacker to get that information. Change the administrator’s
password regularly.
SSID.
There are several things to keep in mind about the SSID:
1.
Disable Broadcast
2.
Make it unique
3.
Change it often
Most wireless networking devices will give you the option of broadcasting the SSID. While this option may be
more convenient, it allows anyone to log into your wireless network. This includes hackers. So, don’t broadcast
the SSID.
Wireless networking products come with a default SSID set by the factory. (The Linksys default SSID is “linksys”.)
Hackers know these defaults and can check these against your network. Change your SSID to something unique
and not something related to your company or the networking products you use.
Change your SSID regularly so that any hackers who have gained access to your wireless network will have to
start from the beginning in trying to break in.
MAC Addresses.
Enable MAC Address filtering. MAC Address filtering will allow you to provide access to only
those wireless nodes with certain MAC Addresses. This makes it harder for a hacker to access your network with
a random MAC Address.
WEP Encryption.
Wired Equivalent Privacy (WEP) is often looked upon as a cure-all for wireless security
concerns. This is overstating WEP’s ability. Again, this can only provide enough security to make a hacker’s job
more difficult.
There are several ways that WEP can be maximized:
1.
Use the highest level of encryption possible
2.
Use “Shared Key” authentication
3.
Change your WEP key regularly
WPA.
Wi-Fi Protected Access (WPA) is the newest and best available standard in Wi-Fi security.
WPA2
is the
newer version of Wi-Fi Protected Access with stronger encryption than WPA. WPA gives you a choice of two
encryption methods: TKIP (Temporal Key Integrity Protocol), which incorporates Message Integrity Code (MIC) to
IMPORTANT:
Always remember that each
device in your wireless network MUST use
the same security method and passphrase or
key; otherwise, your wireless network will
not function properly.
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Appendix B: Wireless Security
Security Threats Facing Wireless Networks
Wireless-G Router for 3G/UMTS Broadband
provide protection against hackers, and AES (Advanced Encryption System), which utilizes a symmetric 128-Bit
block data encryption. (AES is stronger than TKIP.) WPA2 uses TKIP + AES for encryption.
WPA Enterprise and WPA2 Enterprise use a RADIUS (Remote Authentication Dial-In User Service) server for
authentication. RADIUS uses a RADIUS server and WEP encryption.
WPA Personal
. Select the type of algorithm, TKIP or AES, and enter a password in the
Passphrase
field of
8-63 characters. Enter a Group Key Renewal period time between 0 and 99,999 seconds, which instructs the
Router or other device how often it should change the encryption keys.
WPA2 Personal
. WPA2 uses TKIP + AES, with dynamic encryption keys. Enter a
Passphrase
of 8-63
characters. Then enter a Group Key Renewal period, which instructs the Router or other device how often it
should change the encryption keys.
WPA Enterprise
. This method is WPA used in coordination with a RADIUS server. Enter the IP address and
port number of the RADIUS server. Then enter the key shared between the Router and its RADIUS server. Then
enter a Key Renewal Timeout period, which instructs the Router or other device how often it should change
the encryption keys.
WPA2 Enterprise
. This method is WPA2 used in coordination with a RADIUS server. Enter the IP address and
port number of the RADIUS server. Then enter the key shared between the Router and its RADIUS server. Then
enter a Key Renewal Timeout period, which instructs the Router or other device how often it should change
the encryption keys.
RADIUS
. This method is WEP used in coordination with a RADIUS server. Enter the IP address and port
number of the RADIUS server. Then enter the key shared between the Gateway and its RADIUS server. Enter
the WEP settings.
Implementing encryption may have a negative impact on your network’s performance, but if you are transmitting
sensitive data over your network, encryption should be used.
These security recommendations should help keep your mind at ease while you are enjoying the most flexible
and convenient technology Linksys has to offer.
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