• Is a private network using internet
  • data transfer over network as point-to-point private link
  • encapsulates with header, having routing information
  • uses encryption keys
  • tunnel refers to part VPN connection having encapsulated private data
  • protocols used for security in VPN
    • IPSec  or Internet Protocol Security, was  developed for IPv6 and used with IPv4. L2TP runs over IPSec
    • Transport Layer Security or SSL/TLS, tunnels entire network’s traffic, used if IPsec has problems with NAT or firewall
    • Secure Shell or SSH VPN

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