7.5. VPN
7.5.1. IPsec
Fig. 7.7: Menu IPsec
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IPsec basic description
Internet Protocol Security (IPsec) is a network protocol suite that authenticates and encrypts the
packets of data sent over a network. IPsec includes protocols for establishing mutual authentication
between agents at the beginning of the session and negotiation of cryptographic keys for use during
the session. IPsec uses cryptographic security services to protect communications over Internet
Protocol (IP) networks. IPsec supports network-level peer authentication, data-origin authentication,
data integrity, data confidentiality (encryption), and replay protection. IPsec is an end-to-end security
scheme operating in the Internet Layer of the Internet Protocol Suite.
There are 2 modes of operation: Transport and Tunnel; RipEX only offers Tunnel mode. In Tunnel
mode, the entire IP packet is encrypted and authenticated. It is then encapsulated into a new IP
packet (ESP - Encapsulating Security Payloads) with a new IP header.
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