Difference between revisions of "Access Point"
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Revision as of 11:41, 18 November 2009
WORK IN PROGRESS
This tutorial describes how to add Access Point functionality to your LMCE core. The core will act as a WiFi access point permitting wireless devices to connect to the core, the internal network and the internet.
- Dell Optiplex Gx620
- WiFi card with Atheros chipset (using madwifi drivers)
- Linux MCE 810 alpha2
If you install LMCE from scratch make sure that your wifi card is NOT inserted prior to installation so that LMCE doesn't use it as the internal network interface. After LCME installation has finished, insert the wifi card.
the idea is to combine or bridge eth1 and ath0 to a new virtual interface called br0.
- -> eth0 connects to my ADSL modem (192.168.1.0)
- -> eth1 connects to my internal LAN switch (192.168.80.0)
- -> ath0 connects the wireless part of my internal network (192.168.80.0)
We'll make a copy of /etc/network/interfaces in case something goes wrong before we edit it.
mv /etc/network/interfaces /etc/network/interfaces.bck
auto lo eth0 eth1 br0
automatically initialise eth0 (external interface) eth1 (internal LAN) and br0 (our bridge interface). Keep ath0 out of this for now, we'll initialise it separately.
iface lo inet loopback
# Internet Interface iface eth0 inet static address 192.168.1.2 netmask 255.255.255.0 gateway 192.168.1.1 dns-nameservers 192.168.1.1
Fill in your own settings here, in my case 192.168.1.1 is the ADSL modem. Alternatively you can use dhcp to get the adress details from your ADSL modem.
# LAN interface iface eth1 inet manual up /sbin/ifconfig eth0 up down /sbin/ifconfig eth0 down
The internal interface, note that it doesn't get an adress assigned.
# Wireless interface auto ath0 iface ath0 inet manual up /sbin/ifconfig ath0 up
The wireless interface, again no adress details here.
iface br0 inet static address 192.168.80.1 network 192.168.80.0 netmask 255.255.255.0 broadcast 192.168.80.255 pre-up /usr/sbin/brctl addbr br0 pre-up /usr/sbin/brctl addif br0 eth1
The fun part. Finally we assign the adress for the internal LAN to the bridge interace br0 (I'm sticking here with the standard LMCE network 80.0). The pre-up will create a bridge and add the eth1 interface to it.
pre-up /sbin/wlanconfig ath0 destroy pre-up /sbin/wlanconfig ath0 create wlandev wifi0 wlanmode ap pre-up /sbin/iwconfig ath0 channel 3
This part is necessary as the atheros interface has some issues to switch ino access point mode (master mode)
pre-up /usr/sbin/brctl addif br0 ath0
After firing up the wireless interface we add it to the bridge as well.
post-down /usr/sbin/brctl delif br0 eth1 post-down /usr/sbin/brctl delif br0 ath0 post-down /usr/sbin/brctl delbr br0
Just some lines to define how to cleanly shut down the bridge: remove both interfaces and then remove the bridge interace itself
We need to set the bridge (which contains eth1 and ath0) as the new interface for the dhcpd server. Edit /etc/default/dhcp.conf as followed:
We'll use hostapd to manage the wireless part as it provides WPA encryption. I suggest that you first try to setup your network without encryption, make sure it works and then enable encryption.
Enable WPA encryption
- edit the /etc/hostapd
Set static IP adresses
It is possible to set static ip adresses manually instead of using LMCE