Raspberry Pi 3 connecting and setting static IP addresses on multiple networks

So you got Wifi at home and a pocket mobile wifi dongle for remote access when you are traveling. You want Raspbery Pi 3 to know which network it is currently connecting to and assign a static IP accordingly.

Here is how.

1. Edit /etc/wpa_supplicant/wpa_supplicant.conf, then ctrl+x y:
   $sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
   ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1network={
   ssid=”HomeWifi”
   psk=”password_for_home_wifi”
   }network={
   ssid=”PocketMobileWifi”
   psk=”password_for_mobile_wifi”
   }
2. Create a new file /etc/dhcpcd.exit-hook, then ctrl+x y:
   $sudo nano /etc/dhcpcd.exit-hook
   
# This script adds the desired static ip addresses as an alias based on the currently detected network. This compliements /etc/dhcpcd.conf
aliasip=
gw=
if $if_up; then
# Wireless alias
case "$ifssid" in
HomeWifi) aliasip="192.168.1.222/24";gw="192.168.1.1";;
PocketMobileWifi) aliasip="192.168.0.222/24";gw="192.168.0.1";;
esac
if [ -n "$aliasip" ]; then
echo "Adding alias of $aliasip to $interface"
ip addr add "$aliasip" dev "$interface"
ip route add "$aliasip" via "$gw"
fi
fi

3. Save and reboot. We are done! Confused? Leave message below.

Tags: dhcpcddhcpcd.confpistatic ipwifiwpa_supplicant