+ 0 Votes First The Listed 'G MAN' 6 years ago Google VPN for Sonicwall N25 setup Google VPN for Netscreen25 Decide on the security settings for your VPN. You have the endpoints listed in your posts (external IP's). Set up one end as per instructions from the web, then setup the other end. Now modify the firewall rules on both boxes to allow the ports required by the VPN's to communicate. Next initiate a connection from one end of the VPN.