Billion BiPAC 8900X R3, User Manual, Page: 159 / 261

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VPN
A virtual private network (VPN) is a private network that interconnects remote (and often
geographically separate) networks through primarily public communication infrastructures such as
the Internet. VPNs provide security through tunneling protocols and security procedures such as
encryption. For example, a VPN could be used to securely connect the branch offices of an
organization to a head office network through the public Internet.
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
also 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.
IPsec is an end-to-end security scheme operating in the Internet Layer of the Internet Protocol Suite.
It can be used in protecting data flows between a pair of security gateways (network-to-network), or
between a security gateway and a host (network-to-host).
Note: A maximum of 16 sessions for IPSec.
NAT Traversal
NAT Traversal: This directive enables use of the NAT-Traversal IPsec extension (NAT-T). NAT-T
allows one or both peers to reside behind a NAT gateway (i.e., doing address- or port-translation).
Keep Alive: Type the interval time(sec) for sending packets to keep the NAT Traversal alive.
Click Apply to save and apply your settings.