View source for DebConf11/Wireless

So far we have a Buffalo which is doing DHCP and NAT for the main network and acting as an AP covering the main auditorium (rather uselessly until we can use it) and a second AP acting as a bridge covering the upstairs hacklab(s).

We should have more soon when we start to setup a real network tomorrow.  Or maybe even tonight.

= Using the debconf wireless =

The SSID is '''debconf''' and password  '''debconf11''' .

== Hardware list ==

* 11x Buffalo WHR-G54
* 1x NetGear DG8343G v3

== Access Point list ==

{|| border="2" cellpadding="5" cellspacing="0" style="margin: 0.5em 0.5em 0.5em 1em; padding: 0.5em; border: 1px #aaa solid; border-collapse: collapse; font-size: 95%;" 
!''' AP '''!!''' Channel '''!!''' Location '''!!'''MAC Address'''!!'''Notes'''
|-----------------
| B131  || 6 || Round Room || 00:0D:0B:83:7C:68 || 2.4, txpower 10
|-----------------
| B132  || 1 || Auditorium - Left || 00:0D:0B:83:7F:30 || 2.4, txpower 11
|-----------------
| B133  || 11 || Round Room || 00:0D:0B:83:7F:74 || 2.4, txpower 10
|-----------------
| B134  || 6 || Auditorium - Behind stage || 00:0D:0B:83:6D:F4 ||  2.4, txpower max (used to be 11)
|-----------------
| B135  || 11 || Auditorium - Right || 00:0D:0B:83:82:A2 || 2.4, txpower 11
|-----------------
| B136  || 6 || Upstairs Hacklab Middle || 00:0D:0B:83:75:54 || 2.4, txpower 12
|-----------------
| B137  || 11 || Gallery Hacklab in Window || 00:0D:0B:83:6D:78 || 2.4, txpower max (used to be 11), wpa+wpa2 (used to be wpa2 only)
|-----------------
| B138  || 6 || Inside Reception Desk || 00:0D:0B:83:87:64 || 2.4, txpower 10
|-----------------
| B139  || 1 || Gallery Hacklab on Switch || 00:0D:0B:83:90:AA || 2.4, txpower 8
|-----------------
| B140  ||   ||  || 00:0D:0B:83:82:46 || 2.4, '''in stock'''
|-----------------
| B141  || 11 || Upstairs Hacklab in door || 00:0D:0B:83:79:68 || 2.4, txpower normal (used to be 8)
|}

= Documentation for the OpenWRT setup at DebConf11 =

This page describes the accesspoint configuration for DebConf11. We're using the [http://kamikaze.openwrt.org/ Backfire] version of OpenWRT.

The accesspoints will be bridging to provide WPA encrypted wireless on '''debconf''' . On the b+g network we'll use the channels 1, 6 and 11.  We avoid interference as much as possible by turning down the power on the APs, and it will very likely also help for people to turn down the power on their laptops to something like 10dBm.

== Image Source ==

== Buffalo Configurations ==
We're using the standard images from Backfire 10.03.1-rc5 [http://downloads.openwrt.org/backfire/10.03.1-rc5/brcm47xx/ here]. On the buffalo the needed file is the broadcom 47xx .trx file, which uses the open source b43 drivers.

=== /etc/config/network  ===

 config 'switch' 'eth0'
        option 'enable' '1'
 
 config 'switch_vlan' 'eth0_0'
        option 'device' 'eth0'
        option 'vlan' '0'
        option 'ports' '1 2 3 4 5'
 
 config 'switch_vlan' 'eth0_1'
        option 'device' 'eth0'
        option 'vlan' '1'
        option 'ports' '0 5'
 
 config 'interface' 'loopback'
        option 'ifname' 'lo'
        option 'proto' 'static'
        option 'ipaddr' '127.0.0.1'
        option 'netmask' '255.0.0.0'
 
 config 'interface' 'lan'
        option 'type' 'bridge'
        option 'ifname' 'eth0.0'
        option 'proto' 'dhcp'
        # option 'proto' 'static'
        # option 'ipaddr' '192.168.1.1'
        # option 'netmask' '255.255.255.0'
 
 config 'interface' 'wan'
        option 'ifname' 'eth0.1'
        option 'proto' 'static'
        option 'ipaddr' '192.168.1.1'
        option 'netmask' '255.255.255.0'
        option 'dns' '8.8.8.8'  # Google

=== /etc/config/wireless ===

 config 'wifi-device' 'radio0'
 	option 'type' 'mac80211'
 	option 'macaddr' '00:0d:0b:83:75:55' # One more than MAC on side of device
 	option 'hwmode' '11g'
 	option 'disabled' '0'
 	option 'channel' '11'    # adjust channel to suit where the AP will be
 	option 'txpower' '11'   # adjusted when managing the AP later
 	option 'distance' '20'  # adjusted when managing the AP later
 
 config 'wifi-iface'
 	option 'device' 'radio0'
 	option 'network' 'lan'
 	option 'mode' 'ap'
 	option 'ssid' 'debconf'
 	option 'encryption' 'mixed-psk+tkip+ccmp'
 	option 'key' 'debconf11'

=== /etc/config/system ===

 config system
 	option hostname	bXXX
 	option timezone	UTC
 
 config rdate
 	list server ac-ntp0.net.cmu.edu
 	list server ptbtime1.ptb.de
 	list server ac-ntp1.net.cmu.edu
 	list server ntp.xs4all.nl
 	list server ptbtime2.ptb.de
 	list server cudns.cit.cornell.edu
 	list server ptbtime3.ptb.de

== Flashing == 

=== Buffalo ===

 #!/bin/sh
 
 IP=${1:-"192.168.11.1"}
 
 ME="`echo ${IP} | cut -f1-3 -d.`.254"
 sudo ip addr add ${ME}/24 dev eth0
 
 echo "Unplug power, press button on top and replug power"
 echo "Release the button when the upload starts after about 3 seconds"
 CONFIG=config
 #atftp --trace --option "mode octet" -p -l openwrt-brcm-2.4-squashfs.trx ${IP}
 
 CONFIG=config26
 atftp --trace --option "mode octet" -p -l openwrt-brcm47xx-squashfs.trx ${IP}
 
 sudo ip addr del ${ME}/24 dev eth0
 
 sudo ip addr add 192.168.1.254/24 dev eth0
 
 echo "Waiting for flashing"
 sleep 50
 echo "Waiting for reboot"
 sleep 50
 
 echo "Telnet to assign passwd"
 telnet 192.168.1.1
 
 ## Not needed for now, since we're using DHCP
 # echo "Edit to assign IP address"
 # gvim -f ${CONFIG}/network
 ping -c1 192.168.1.1 >/dev/null
 MACADDR="`arp -i eth0 | grep 192.168.1.1 | cut -c34-51`"
 
 
 echo "Edit to assign wireless channel"
 gvim -f ${CONFIG}/wireless
 
 echo "Edit to assign Hostname"
 gvim -f ${CONFIG}/system
 
 echo "Push ssh authorized_keys to device"
 scp ~/.ssh/id_rsa.pub root@192.168.1.1:/etc/dropbear/authorized_keys
 
 echo "Push configuration to device"
 scp ${CONFIG}/* root@192.168.1.1:/etc/config
 
 scp kmod-ipv6_2.6.32.27-1_brcm47xx.ipk root@192.168.1.1:
 ssh root@192.168.1.1 opkg install kmod-ipv6_2.6.32.27-1_brcm47xx.ipk
 
 sudo ip addr del 192.168.1.254/24 dev eth0 2>/dev/null

=== Your .ssh config ===
You may want to add this stanza to your own ~/.ssh/config to disable host key checking on 192.168.1.* so that you can ssh into multiple APs as you're flashing them without getting annoying warnings about the host key (of course) being changed...

 Host 192.168.1.*
   StrictHostKeyChecking no
   GlobalKnownHostsFile /dev/null
   UserKnownHostsFile /dev/null

== Issues ==

=== Issues Log ===
Add your issue here, including the MAC address of the AP you saw the issue with, the date & time, and any other useful information you can think of.  Then tell karora on IRC your own wireless MAC address.

= See also =

* [[DebConf11/Network]]

----
[[Category:DebConf11]]
[[Category:Networking]]