Creating a wireless Access Point using a wireless card not supporting AP mode

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Category: Linux Articles
Published on Saturday, 22 February 2014 11:28
Written by Administrator
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This article talks about how to create a wirless access point even when your wifi card does not support AP mode. The list of supported interface modes is obtained by giving the command $iw list. You would get a output as under

 Supported interface modes:

* IBSS

* managed

* monitor

Incase your card supports the above three modes, this article is for you. Incase you are lucky and card supports AP mode also, then I would recommend use hostapd.

1.   To start with I suggest you load install Bactrack as we would require airmon-ng software , this comes preloaded in backtrack . 

2. Open a terminal and give following commands to start an AP

 

#Terminal1

airmon-ng start wlan0

airbase-ng -e SSID -c 10 mon0

 2. Open another terminal and give following commands to configure the at0 port of AP and iptable rules required for NAT

 #Terminal2

ifconfig at0 up

ifconfig at0 mtu 1400

ifconfig at0 192.168.2.1 netmask 255.255.255.0

 dnsmasq -d -k -q

 # iptable rules to route traffic and for NAT

iptables --flush

iptables --table nat --flush

iptables --delete-chain

iptables --table nat --append POSTROUTING --out-interface eth0  -j MASQUERADE

# we are assuming a setup that wlan0 is the wireless card used to setup the AP and eth0 is the ethernet interface connected to the Internet.

# Instead of eth0 we could have ppp0  if we were using a USB 3G dongle to connect to the internet.

iptables --append FORWARD --in-interface at0 -j ACCEPT

echo 1 > /proc/sys/net/ipv4/ip_forward