6 Security
6.1 VPN
A virtual private network (VPN) extends a private network across a public network, such as the Internet. It enables a
computer to send and receive data across shared or public networks as if it were directly connected to the private network,
while benefitting from the functionality, security and management policies of the private network. This is done by
establishing a virtual point-to-point connection through the use of dedicated connections, encryption, or a combination of
the two. Tunnel technology supports data confidentiality, data origin authentication and data integrity of network
information by utilizing encapsulation protocols, encryption algorithms, and hashing algorithms.
Figure 231 – VPN
The NTC-400 Series Router supports different tunnelling technologies such as IPSec, OpenVPN, L2TP (over IPSec), PPTP and
GRE to establish secure tunnels between multiple sites for data transfer. More advanced functions such as Full Tunnel,
Tunnel Failover, Tunnel Load Balance, NetBIOS over IPSec, NAT Traversal and Dynamic VPN are also supported.
6.1.1 IPSec
Internet Protocol Security (IPSec) is a protocol suite for securing Internet Protocol (IP) communications by authenticating and
encrypting each IP packet of a communication session. IPSec includes protocols for establishing mutual authentication
between agents at the beginning of the session and negotiation of cryptographic keys to be used during the session.
An IPSec VPN tunnel is established between IPSec client and server. The IPSec VPN client is referred to as the initiator and the
IPSec VPN server as the responder.
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