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Netgear WPN111 Manual

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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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