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Configuración de un punto de acceso inalámbrico (Wireless Access Point )

Work in Progress

Este Howto explica cómo puede usar su computadora como un punto de acceso inalámbrico.
Esto significa que si la computadora tiene una conexión a Internet y una interfaz inalámbrica, otras computadoras pueden usar su conexión a Internet a través de wlan.
Esta es una configuración muy limitada, se puede ampliar con DHCP, DNS y un firewall, pero estos temas se pueden encontrar en otros Howtos aquí en SlackDocs.

Requisitos

El paquete hostapd está disponible en slackbuilds.org. Proporciona un demonio que escucha en la interfaz inalámbrica y permite que los clientes se autentiquen.

Configuring hostapd

The configuration of hostapd is done in the file /etc/hostapd/hostapd.conf, here an example

# the wireless interface 
interface=wlan0
# the driver -- there are other settings possible, but very likely the following works 
driver=nl80211
logger_syslog=-1
logger_syslog_level=2
logger_stdout=-1
logger_stdout_level=2
dump_file=/tmp/hostapd.dump
ctrl_interface=/var/run/hostapd
ctrl_interface_group=0
# The SSID -- i.e. the name of the wireless network (which will be shown when you scan for available networks)
ssid=yourwlannamehere
country_code=DE
# check the manpage for hostapd and your hardware for the mode
hw_mode=g
channel=7
beacon_int=100
dtim_period=2
max_num_sta=255
rts_threshold=2347
fragm_threshold=2346
macaddr_acl=0
auth_algs=3
ignore_broadcast_ssid=0
eapol_key_index_workaround=0
eap_server=0
own_ip_addr=127.0.0.1
wpa=1
# The WPA2 key 
wpa_passphrase=your very secret passphrase here
# the next settings refer to the settings in the clients wpa_supplicant.conf
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP 
rsn_pairwise=CCMP

Be sure to read the manpage for hostapd

Configuring the client

In this Howto I'll only describe a minimal setup with a static IP-configuration.

ip-adress: 192.168.45.10
subnetmask: 255.255.255.0
gateway: 192.168.45.1

Since we have (in this minimal configuration) no DNS-server running in our network, you'll have to configure your client with the same DNS-server that your Accesspoint is using (look at /etc/resolv.conf).

IP_forwarding and routing

Enable IP forwarding

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

Internet Connection Sharing

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

In this case eth0 is the interface which is connected to the internet. If your computer has a connection via ppp you shouls use ppp0 instead of eth0.

Starting the Accesspoint

ifconfig wlan0 192.168.45.1 up
/etc/rc.d/rc.hostapd start

The first line starts wlan0 with IP-adress 192.168.45.1, the second line starts the daemon.

Sources


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