TP-Link TL-R600VPN Configuration Manual page 134

Configuring VPN VPN
IPSec
IPSec (IP Security) can provide security services such as data confidentiality, data integrity
and data authentication at the IP layer. IPSec uses IKE (Internet Key Exchange) to handle
negotiation of protocols and algorithms based on the user-specified policy, and to
generate the encryption and authentication keys to be used by IPSec. IPSec can be used
to protect one or more paths between a pair of hosts, between a pair of security gateways,
or between a security gateway and a host. The security gateway refers to a device which
implements IPSec protocol. For example, a router or a firewall implementing IPSec is a
security gateway.
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