pi-hotspot

setup a raspberry pi as a wifi repeater-ish hospot

Currently in the process of updating this for the pi 3 B+ and raspbian stretch

Start by following the raspberry pi documentation

https://www.raspberrypi.org/documentation/configuration/wireless/access-point.md

install

• dnsmasq
• hostapd
• unionfs-fuse

configure

• wpa_suplicant
  • you need to add a few lines

    network={
      ssid="the ssid of the network to connect to"
      key_mgmt=WPA-PSK
      psk="your key"
    }
  

• hostapd
  • in /etc/defaults/hostapd set DAEMON_CONF="/etc/hostapd/hostapd.conf"
  • use the hostapd.conf and set your ssid correctly => mostly works but needs tweaking
  • put your shared key in /etc/hostapd/hostapd.wpa_psk => seems I had to use wpa_passphrase as this might not be working?
• follow instructions for dhcp server
  • using 172.16.1.1 is a private IP address
• union-fuse for read only fs
  • see my project pi-ro-mount
• One thing I like to do on my raspberry pi devices is to turn off swap and make tmp a tmpfs filesystem
  • add this to your fstab

      tmpfs            /tmp            tmpfs   defaults,noatime,nosuid,nodev,noexec,mode=1777,size=64M 
    

  • You can also do this for
    • /var/log
    • /var/lib/dhcp
    • /var/lib/dhcpcd5
    • /var/run
    • /var/lock
• ip forwarding
  • sysctl -w net.ipv4.ip_forward=1
  • sysctl -p /etc/sysctl.conf
  • iptables forwarding setup
    • copy the iptables script to /etc/network/if-up.d/iptables
    • chmod +x /etc/network/if-up.d/iptables
  • you may need to do the following
    • echo "1" > /proc/sys/net/ipv4/conf/wlan0/forwarding
    • echo "1" > /proc/sys/net/ipv4/conf/wlan1/forwarding