Abstract. Wireless local area network or WLAN more vulnerability than wired network even though WLAN
has many advantages over wired. Wireless networks use radio transmissions to carry data between end users
and access point. Therefore, it is possible for someone to sit in your office building's lobby or parking lot or
parking lot to eavesdrop on the wireless network communication. This paper discussed securing wires local
area network used WPA2 Enterprise based PEAP MS-CHAP and Captive portal firewall. We also
divided the network for employer and visitor to increase the level of security. Our experiment
showed that the WLAN could be broken using the attacker tool such as airodump, aireply, and
aircrack.
1 Introduction
Wireless communication is exchange of information
between two or more devices that are not connected by an
electrical conductor. A wireless local area network
(WLAN) links two or more devices over a short distance
using a wireless distribution method, usually providing a
connection through an access point for internet access.
The use of technology spread-spectrum or
Orthogonal Frequency-Division Multiplexing (OFDM)
technologies may allow users to move around within a
local coverage area, and still remain connected to the
network [1], [2]. Using Wireless Local Area Network
users can access internet without pulling the cable
network.
WLAN can overcome the problem of lack of wired
network, because it has the advantage, as follows:
Mobility: WLAN users can gain access to internet at
anywhere from one access point to another access
point, without preparing cable or network
infrastructure.
Scalability: WLANs can be configured to different
topology depending on the needs of the system.
Configuration can be easily changed from peer-topeer
network until the number of users to full
infrastructure networks with thousands of users.
Installation and Simplicity: Wireless network is very
simple to configure. Simplicity of installation is
more cost effective, network setup and installation
do not need to use of cables.
Installation Flexibility: WLAN users can gain access
to the network without preparing the cable
infrastructure.
With an explosive increase of internet application
and a further wireless security system requirement, the
network administrator will face more difficult challenge
in meeting the ever stringent security design. Securing a
wireless network is even more important than securing a
wired network for one simple reason: Accessing a
wireless network does not require physical access to a
network jack or cable, as does accessing a wired network.
[3], [4]. Wireless networks use radio transmissions to
carry data between end users and the network. Therefore,
it is possible for someone to sit in your office building's
lobby or parking lot to eavesdrop on wireless network
communications.
The answer to this problem is to use strong
encryption to protect data transmitted over a wireless
network and to use authentication to each one who would
like to use the wireless network. There are several
security schemes that can be used, namely Hidden SSID,
MAC Address Filtering, and WEP security protocols or
WPA/WPA2-PSK. However, these schemes also have
weaknesses and can be exploited.
In our proposed method to improve the wireless
security, we used two level securities. First we used the