Earthweb.com Practically Networked Home Earthweb developer.com HardwareCentral earthwebdeveloper CrossNodes Datamation
Welcome to PractiallyNetworked
Product Reviews

 • Routers
 • Hubs/Switches
 • Wireless Gateway
 • Wireless AP
 • Wireless NIC
 • Network Storage
 • Print Servers
 • Bluetooth Adapters
Troubleshooting
& Tutorials

 • Networking
 • Internet Sharing
 • Security
 • Backgrounders
 • Troubleshooting
    Guides

 • PracNet How To's
User Opinions
Practicallynetworked Glossary

 Find a Network Term  
 
Forums
About
Jobs
Home

  Most Popular Tutorials

• Microsoft Vista Home Networking Setup and Options
The most daunting part of upgrading to Windows Vista may be trying to figure out where in the layers of menus the networking and file-sharing options are hidden.

• Do It Yourself: Roll Your Own Network Cables
It may not be something you do everyday, but having the supplies and know-how to whip up a network cable on the spot can be very handy.

• Tips for Securing Your Home Router
Seemingly minor and easily overlooked settings can still have profound security implications. Here are some steps you can take to make sure your wired or wireless home router and by extension, your network is as secure as possible.

  Most Popular Reviews

• Microsoft Windows Home Server
If you have a home network, you'll welcome the easy file sharing, remote access and the image-based backup features of Windows Home Server.

• Iomega StorCenter Network Hard Drive
Iomega's fourth generation StorCenter Network Hard Drive brings many of the features found in higher-end storage devices down to an attractive price.

• MikroTik's The Dude
This free tool delivers many of the same capabilities that you'd find in pricey network monitoring tools. As long as you don't mind tinkering, The Dude is a decent network utility that should be worth the download.



Networking
SW Proxy Servers  
NAT SW (ICS, Sygate, etc)
NAT HW Routers
NAT HW & SW
Wireless
Other Problems
 
Secure LAN
Special Applications
Other Help
Tools


128 bit WEP devices can be used with 40 or 64 bit WEP devices as long as the device driver has a way to set the lower encryption level.  Encryption level is determined by the encryption key length. If a device is capable of 128 bit encryption, it's inherently capable of 40 bit, unless the vendor decides for some reason to not allow the lower encryption level. 

64 bit WEP is the same as 40 bit WEP! 
The lower level of WEP encryption uses a 40 bit (10 Hex character) "secret key" (set by the user), and a 24 bit "Initialization Vector" (not under user control). Some vendors refer to this level of WEP as 40 bit, others as 64 bit.  Either way, they're the same encryption level and can interoperate.

The higher level of WEP encryption, commonly referred to as 128 bit WEP, actually uses a 104 bit (26 Hex character) "secret key" (set by the user), and a 24 bit "Initialization Vector" (not under user control). 

 

Mixing vendors

The methods for entering WEP codes are confusing enough, but it gets worse if you are trying to get wireless products from different manufacturers to work together!  A particularly tricky combination is products based on the Lucent/WaveLAN drivers (ORiNOCO, Buffalo Tech) with products based on the Intersil PRISM drivers (SMC, Linksys, D-Link, others).  

The key to success is to pay attention to the WEP key formats that must be used for each product.

The Lucent based products typically require you to enter the WEP key in either ASCII or Hexadecimal (Hex) format.  The default is ASCII, i.e. regular alpha-numeric characters.  If you want to use Hex format, you must start the code with "0x" (that's the number zero and a lower-case "x"). A typical WaveLAN based WEP setup screen is shown below.

Lucent/WaveLAN WEP setup screen

In this example, Keys 1, 2, and 4 use ASCII format and Key 3 uses Hexadecimal.


Now look at this typical Intersil PRISM WEP client setup screen.  This example is from a Client card that allows either 64 or 128 bit WEP.  

Typical Intersil PRISM 40/64 bit WEP entry screen

Two methods can be used:

1) Passphrase Method:  
This method generates a Hexadecimal key from an ASCII string that you enter.

This is not the same as directly entering an ASCII key!

2) Manual Entry Method:  
This method requires you to enter a 10 character Hexadecimal key for 64 bit WEP, and a 26 character Hexadecimal key for 128 bit WEP. (The "Manual Entry" input area changes to accomodate the larger key.)

 

The simplest way to get these two products to work together is to use Hexadecimal keys, since that method is common to both.  

Tip #1: Remember to use the "0x" prefix to indicate Hexadecimal

  Tip #2: Make sure your card can support the WEP level that you are trying to set!  ORiNOCO "Silver" cards support only 64 bit WEP.  "Gold" cards support 64 or 128 WEP.

Tip #3: Remember to enter the correct number of characters for the desired encryption level in the Lucent WEP Setup window.   Use the popup WEP Code Summary if you forget how many characters you need to use.


Wireless Encryption Overview

Mixing WEP Levels

PopUp WEP Code Reference

 

To read further...

See the links on this page.



Earthwebnews.com Earthweb developer.com HardwareCentral earthwebdeveloper CrossNodes Datamation


Home | Networking | Backgrounders | Internet Sharing | Security | HowTo | Troubleshooting | Reviews | News | About | Jobs | Tools | Forums