Bedienungsanleitung Netgear WPN111 (Seite 59 von 87) (Englisch)

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User Manual for the NETGEAR RangeMax™ Wireless USB 2.0 Adapter WPN111

Wireless Networking Basics B-13

202-10076-01

7. If the authentication server accepts the client, then the access point will transition the client's

port to an authorized state and forward additional traffic.

Initial 802.1x communications begin with an unauthenticated supplicant (i.e., client device)

attempting to connect with an authenticator (i.e., 802.11 access point). The access point responds

by enabling a port for passing only EAP packets from the client to an authentication server located

on the wired side of the access point. The access point blocks all other traffic, such as HTTP,

DHCP, and POP3 packets, until the access point can verify the client's identity using an

authentication server (e.g., RADIUS). Once authenticated, the access point opens the client's port

for other types of traffic.

The basic 802.1x protocol provides effective authentication and can offering dynamic key

management using 802.1x as a delivery mechanism. If configured to implement dynamic key

exchange, the 802.1x authentication server can return session keys to the access point along with

the accept message. The access point uses the session keys to build, sign and encrypt an EAP key

message that is sent to the client immediately after sending the success message. The client can

then use contents of the key message to define applicable encryption keys. In typical 802.1x

implementations, the client can automatically change encryption keys as often as necessary to

minimize the possibility of eavesdroppers having enough time to crack the key in current use.

It's important to note that 802.1x doesn't provide the actual authentication mechanisms. When

using 802.1x, you need to choose an EAP type, such as Transport Layer Security (EAP-TLS) or

Protected EAP (PEAP), which defines how the authentication takes place.

The important part to know at this point is that the software supporting the specific EAP type

resides on the authentication server and within the operating system or application software on the

client devices. The wireless access point acts as a “pass through” for 802.1x messages. As a result,

you can update the EAP authentication type as newer types become available and your

requirements for security change.

802.1x is well on its way to becoming an industry standard, and provides an effective wired and

wireless LAN security solution. Windows XP implements 802.1x natively, and the NETGEAR

RangeMax™ Wireless USB 2.0 Adapter WPN111 supports 802.1x. The 802.11i committee is

specifying the use of 802.1x to eventually become part of the 802.11 standard.

WPA Wireless Security

Wi-Fi Protected Access (WPA) is a specification of standards-based, interoperable security

enhancements that increase the level of data protection and access control for existing and future

wireless LAN systems.

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