Add firewall rules

gistfile1.txt

cat >> /etc/config/firewall << EOF
config zone
    option name 'VPN_FW'
    option input 'REJECT'
    option output 'ACCEPT'
    option forward 'REJECT'
    option masq '1'
    option mtu_fix '1'
    option network 'PIA_VPN'

config forwarding                               
    option dest 'VPN_FW'                    
    option src 'lan' 
EOF