What is the "shared secret" used for in IPSec VPN?

The instructions below demonstrate how to connect to the VPN service using native functionality for Mac OSX. However, due to security concerns and the need to reconfigure your connection in the future, OIT does not recommend using this ability, but rather recommends users connect using the Cisco AnyConnect client. GRE/IPsec - VyOS Wiki We assume that IPsec will use pre-shared secret authentication and will use AES128/SHA1 for the cipher and hash. Adjust this as necessary. Contents. 1 Note for VMWare users; 2 Setup option #1: IPsec policy to match GRE protocol; 3 Setup option #2: sourcing the tunnel from loopbacks. Connecting Windows 10 Clients to IPSec VPN using Security

Jul 12, 2020

How IPSec Works > VPNs and VPN Technologies | Cisco Press

and you are defining the pre-shared key in your tunnel-group configuration like this. tunnel-group type ipsec-l2l tunnel-group ipsec-attributes ikev1 pre-shared-key ***** And more over phase 1 will encrypt the phase 2 negotiations and phase 2 will encrypt the actual data between two sites / LAN's.

Shared secret | Fortinet Technical Discussion Forums