• Microsoft has brought out the ISA-Internet security and Acceleration server software to cater to the growing needs of enterprises using the internet as a medium of communication. The step by step set up and configuration of the ISA server and the remote access to the ISA server is available on the Microsoft website. Many other VPN consultants have online articles on the connection and configuration process.
• Companies that offer specific products like hardware provide the necessary support on their websites so that you can configure the software you have for optimum security and performance.
• CISCO offers Cisco PIX 500 series security appliances (PIX 515E, PIX 525, and PIX 535) and the Cisco ASA 5500 series security appliances (ASA 5510, ASA 5520, and ASA 5540) for VPN
• Firewall/VPN Appliances offered by Sonic wall use ICSA deep packet inspection firewall and IPSec for encryption The many devices offered are PRO 5060, PRO 4100, PRO 4060, PRO 3060, PRO 2040, PRO 1260, TZ 170 SP Wireless, TZ 170 Wireless, TZ 170 SP, TZ 170, TZ 150 Wireless and TZ 150.
• AEP Systems delivers hardware security and acceleration solutions which include SSL VPNs,high-security VPN encryptors and SSL acceleration hardware.These are SureWare NEt, SureWare Keyper, and SureWare A-Gate. Netilla Networks, Inc. is a leader in secure application access solutions along with AEP systems it offers solutions for VPN. Its Security Platform-NSP suite is for SSL VPN solutions, Netilla Secure Gateway Appliance (SGA) is for midsize business that need SSL VPN solutions.
• SonicWALL site to site VPN along with Internet security appliances offer traditional site-to-site connections to securely communicate with their multiple locations.

Site to site VPN solutions can adopt any protocol for its security and authentication. PPTP,L2TP,IPSec, SSL all differ in areas of implementation. The choice of VPN network connection for intranet or extranet based site to site VPN’s should not compromise the security of the sister network.