Raspberry Pi – WLAN Bridge

Table of Contents

Intro

Create a WLan Bridge with a Raspberry Pi for you only EthernetPort devices. I use it to get Internet to my Router from a Wireless Internet

Instructions

Add reconnect file

Edit network-monitor.sh file

				
					sudo nano /usr/local/bin/network-monitor.sh
				
			

Add this to network-monitor.sh file

				
					#!/bin/bash

##################################################################
# Settings
# Which Interface do you want to check/fix
wlan='wlan0'
# Which address do you want to ping to see if the network interface is alive?
pingip='192.168.2.1' #		8.8.8.8		1.1.1.1		192.168.1.1 	192.168.4.1
##################################################################

echo "Performing Network check for $wlan"
/bin/ping -c 1 -I $wlan $pingip > /dev/null 2> /dev/null
if [ $? -ge 1 ] ; then
    echo "Network connection down! Attempting reconnection."
    ip link set wlan0 down
    sleep 5
    ip link set wlan0 up
else
    echo "Network is Okay"
fi
				
			

Give permissen to network-monitor.sh

				
					sudo chmod +x /usr/local/bin/network-monitor.sh
				
			

Make it run by crontab

				
					sudo crontab -e
				
			

Execution time for the file

				
					*/5 * * * * /usr/local/bin/network-monitor.sh # every 5 minutes
				
			

WLan Setup

Edit wpa_supplicant.conf

				
					sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
				
			

Add this to wpa_supplicant.conf

				
					# Edit the WLAN settings to your likings!

network={
    ssid="WLAN1"
    psk="passwordOne"
    priority=1
}

network={
    ssid="WLAN2"
    psk="passwordTwo"
    priority=2
}
				
			

If you want to check SSID

				
					ifconfig wlan0
				
			
				
					iwgetid
				
			

WLan Bridge

Install dnsmasq

				
					sudo apt-get install dnsmasq
				
			

Edit dhcpcd.conf

				
					sudo nano /etc/dhcpcd.conf
				
			

Search and edit

				
					interface eth0
static ip_address=192.168.4.1/24
				
			

BackUp dnsmasq.conf

				
					sudo mv /etc/dnsmasq.conf /etc/dnsmasq.conf.orig
				
			

Edit dnsmasq.conf

				
					sudo nano /etc/dnsmasq.conf
				
			

Search and edit

				
					interface=eth0
dhcp-range=192.168.4.8,192.168.4.250,255.255.255.0,12h
				
			

Edit sysctl.conf

				
					sudo nano /etc/sysctl.conf
				
			

Edit to

				
					net.ipv4.ip_forward=1
				
			

Edit rc.local

				
					sudo nano /etc/rc.local
				
			

add this

				
					iptables -t nat -A  POSTROUTING -o wlan0 -j MASQUERADE
				
			

Restart

				
					sudo reboot
				
			

Check Status

				
					sudo service dnsmasq status
				
			

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