Ipsec - Teltonika RUT240 User Manual

8.4.2 IPSec

The IPsec protocol client enables the router to establish a secure connection to an IPsec peer via the Internet.
IPsec is supported in two modes - transport and tunnel. Transport mode creates secure point to point channel between
two hosts. Tunnel mode can be used to build a secure connection between two remote LANs serving as a VPN solution.
IPsec system maintains two databases: Security Policy Database (SPD) which defines whether to apply IPsec to a
packet or not and specify which/how IPsec-SA is applied and Security Association Database (SAD), which contain Key of
each IPsec-SA.
The establishment of the Security Association (IPsec-SA) between two peers is needed for IPsec communication. It
can be done by using manual or automated configuration.
Note: router starts establishing tunnel when data from router to remote site over tunnel is sent. For automatic
tunnel establishment used tunnel Keep Alive feature.
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