TechnoDogs Knowledge Base

Configuring the pi this way has the benefit of never having to seek out its ip address. Just connect to the pi's network and you have access to the machine. That is the major PRO of this set up, but there are some cons:

• Connecting the PI loses your own internet access unless you bridge the pi to the local network
• FRC robots are not allowed to have hot spots on them
• Multiple PIs in the house will conflict unless you have a system for unique networks

We are going to solve these cons later but lets just get the pi up and running as an access point.

sudo apt-get install dnsmasq
sudo apt-get install hostapd

Make sure the new services are not running

sudo systemctl stop dnsmasq
sudo systemctl stop hostapd

Now we pick a network that the PI will host. I am choosing 192.168.3.x as our network. That way someone may get the address 192.168.3.14 which has the value of pi in it.

Now put the following at the end /etc/dhcpcd.conf

interface wlan0
  static ip_address=192.168.3.1/24

Restart dhcpcd

sudo service dhcpcd restart

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

and add the following

interface=wlan0      # Use the require wireless interface - usually wlan0
  dhcp-range=192.168.3.2,192.168.3.50,255.255.255.0,24h
  

Edit

sudo emacs /etc/hostapd/hostapd.conf

and put

interface=wlan0
driver=nl80211
ssid=raspberry
hw_mode=g
channel=7
wmm_enabled=0
macaddr_acl=0
auth_algs=1
ignore_broadcast_ssid=0
wpa=2
wpa_passphrase=robotfun
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP

Now edit

sudo emacs /etc/default/hostapd

and set DAEMON_CONF=“/etc/hostapd/hostapd.conf”

sudo systemctl unmask hostapd
sudo systemctl enable hostapd
sudo systemctl start hostapd
sudo systemctl start dnsmasq

First uncomment net.ipv4.ip_forward=1 in /etc/sysctl.conf

Doing the below, but I dont like it. Need a solution that does not use rc.local

Add a masquerade and save it

sudo iptables -t nat -A  POSTROUTING -o eth0 -j MASQUERADE
sudo sh -c "iptables-save > /etc/iptables.ipv4.nat"

add to rc.local

iptables-restore < /etc/iptables.ipv4.nat