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Page 51 / 69 Scroll up to view Page 46 - 50
45
Appendix A: Troubleshooting
Frequently Asked Questions
Wireless-G Ethernet Bridge with 5-Port Switch
Can I run an application from a remote computer over the wireless network?
This will depend on whether or not the application is designed to be used over a network. Consult the
application’s user guide to determine if it supports operation over a network.
Can I play multiplayer games with other users of the wireless network?
Yes, as long as the game supports multiple players over a LAN. Refer to the game’s user guide for more
information.
What is ad-hoc mode?
When a wireless network is set to ad-hoc mode, the wireless-equipped computers are configured to
communicate directly with each other. The ad-hoc wireless network will not communicate with any wired
network.
What is infrastructure mode?
When a wireless network is set to infrastructure mode, the wireless network is configured to communicate with
a wired network through a wireless access point.
What is roaming?
Roaming is the ability of a portable computer user to communicate continuously while moving freely throughout
an area greater than that covered by a single wireless network access point. Before using the roaming function,
the workstation must make sure that it is the same channel number as the wireless network access point of the
dedicated coverage area.
To achieve true seamless connectivity, the wireless LAN must incorporate a number of different functions. Each
node and wireless network access point, for example, must always acknowledge receipt of each message. Each
node must maintain contact with the wireless network even when not actually transmitting data. Achieving these
functions simultaneously requires a dynamic RF networking technology that links wireless network access points
and nodes. In such a system, the user’s end node undertakes a search for the best possible access to the system.
First, it evaluates such factors as signal strength and quality, as well as the message load currently being carried
by each wireless network access point and the distance of each wireless network access point to the wired
backbone. Based on that information, the node next selects the right wireless network access point and registers
its address. Communications between end node and host computer can then be transmitted up and down the
backbone.
As the user moves on, the end node’s RF transmitter regularly checks the system to determine whether it is in
touch with the original wireless network access point or whether it should seek a new one. When a node no
longer receives acknowledgment from its original wireless network access point, it undertakes a new search.
Upon finding a new wireless network access point, it then re-registers, and the communication process
continues.
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46
Appendix A: Troubleshooting
Frequently Asked Questions
Wireless-G Ethernet Bridge with 5-Port Switch
What is ISM band?
The FCC and their counterparts outside of the U.S. have set aside bandwidth for unlicensed use in the ISM
(Industrial, Scientific and Medical) band. Spectrum in the vicinity of 2.4 GHz, in particular, is being made available
worldwide. This presents a truly revolutionary opportunity to place convenient high speed wireless capabilities in
the hands of users around the globe.
What is Spread Spectrum?
Spread Spectrum technology is a wideband radio frequency technique developed by the military for use in
reliable, secure, mission-critical communications systems. It is designed to trade off bandwidth efficiency for
reliability, integrity, and security. In other words, more bandwidth is consumed than in the case of narrowband
transmission, but the trade-off produces a signal that is, in effect, louder and thus easier to detect, provided that
the receiver knows the parameters of the spread-spectrum signal being broadcast. If a receiver is not tuned to
the right frequency, a spread-spectrum signal looks like background noise. There are two main alternatives,
Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS).
What is DSSS? What is FHSS? And what are their differences?
Frequency Hopping Spread Spectrum (FHSS) uses a narrowband carrier that changes frequency in a pattern that
is known to both transmitter and receiver. Properly synchronized, the net effect is to maintain a single logical
channel. To an unintended receiver, FHSS appears to be short-duration impulse noise. Direct Sequence Spread
Spectrum (DSSS) generates a redundant bit pattern for each bit to be transmitted. This bit pattern is called a chip
(or chipping code). The longer the chip, the greater the probability that the original data can be recovered. Even if
one or more bits in the chip are damaged during transmission, statistical techniques embedded in the radio can
recover the original data without the need for retransmission. To an unintended receiver, DSSS appears as low
power wideband noise and is rejected (ignored) by most narrowband receivers.
Would the information be intercepted while transmitting on air?
Linksys products feature two-fold protection in security. On the hardware side, as with Direct Sequence Spread
Spectrum technology, it has the inherent security feature of scrambling. On the software side, Linksys products
offer the encryption function (WEP) to enhance security and access control. Users can set it up depending upon
their needs.
What is WEP?
WEP is Wired Equivalent Privacy, a data privacy mechanism based on a 40/64 bit shared key algorithm, as
described in the IEEE 802.11 standard.
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47
Appendix B: Wireless Security
Security Precautions
Wireless-G Ethernet Bridge with 5-Port Switch
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 7: Using the Wireless-G Ethernet
Bridge Web-based Utility.” The wireless security can be set up on this page.
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 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.
Note:
Some of these security features are
available only through the network router or
access point. Refer to the router or access
point’s documentation for more information.
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48
Appendix B: Wireless Security
Security Threats Facing Wireless Networks
Wireless-G Ethernet Bridge with 5-Port Switch
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. Two modes are
available: Pre-Shared Key and RADIUS. Pre-Shared Key gives you a the encryption method TKIP (Temporal Key
Integrity Protocol), which utilizes a stronger encryption method and incorporates Message Integrity Code (MIC) to
provide protection against hackers.RADIUS (Remote Authentication Dial-In User Service) utilizes a RADIUS server
for authentication and the use of dynamic TKIP or WEP.
Important:
Always remember that each
device in your wireless network MUST use
the same encryption method and encryption
key or your wireless network will not function
properly.
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49
Appendix B: Wireless Security
Security Threats Facing Wireless Networks
Wireless-G Ethernet Bridge with 5-Port Switch
WPA Pre-Shared Key
. If you do not have a RADIUS server, enter a password in the Pre-Shared key field of 8-
64 characters, and 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.
RADIUS
. WEP used in coordination with a RADIUS server. (This should only be used when a RADIUS server is
connected to the Router or other device.) First, enter the RADIUS server’s IP Address and port number, along
with a key shared between the device and the server. Then, select a WEP key and a level of WEP encryption,
and either generate a WEP key through the Passphrase or enter the WEP key manually.
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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