Summary

__20h__ got us an ubiquity access point, which is connected to [1].

Architecture

The AP is connected to the re0 port on our firewall, and mounted in the antenna mast on the roof. The SSID itself is open, and connects to the Freifunk network over VPN. It is not possible to connect to the NURDspace network if you connect to this AP. Ratelimiting is applied on the ap. 20mbit/s down, and 5mbit/s up.

Monitoring

On time.lan.nurd.space (the raspberry pi doing NTP via GPS) is polling for the chemnitz.freifunk.net wifi ssid (as it is as raspberry pi and has wifi...). If it is not available, then a message is sent to the irc-bofh channel.

#! /usr/bin/sh

/usr/sbin/iwlist wlan0 scan | /usr/bin/grep -q chemnitz.freifunk.net
STATE=$?

STATE_FILE=/tmp/.chemnitz.freifunk.net.state
PREVSTATE=`cat $STATE_FILE 2> /dev/null`
if [ $STATE != "$PREVSTATE" ] ; then
	echo state changed from "$PREVSTATE" to $STATE
	echo $STATE > $STATE_FILE
	
	if [ $STATE -eq 1 ] ; then
		echo freifunk node is down
		/usr/bin/mosquitto_pub -h mqtt.vm.nurd.space -t GHBot/to/irc/nurdsbofh/notice -m 'Freifunk node (__20h__) is down'
	else
		echo freifunk node is up again
		/usr/bin/mosquitto_pub -h mqtt.vm.nurd.space -t GHBot/to/irc/nurdsbofh/notice -m 'Freifunk node (__20h__) is up again'
	fi
fi