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> Chapter 14 - IPsec VPN > Phase 1 parameters > Overview


To configure IPsec Phase 1 settings, go to VPN > IPsec > Tunnels and edit the Phase 1 Proposal (if it is not available, you may need to click the Convert to Custom Tunnel button).

IPsec Phase 1 settings define:

  • The remote and local ends of the IPsec tunnel
  • If Phase 1 parameters are exchanged in multiple rounds with encrypted authentication information (main mode) or in a single message with authentication information that is not encrypted (aggressive mode)
  • If a preshared key or digital certificates will be used to authenticate the FortiGate unit to the VPN peer or dialup client
  • If the VPN peer or dialup client is required to authenticate to the FortiGate unit. A remote peer or dialup client can authenticate by peer ID or, if the FortiGate unit authenticates by certificate, it can authenticate by peer certificate.
  • The IKE negotiation proposals for encryption and authentication
  • Optional XAuth authentication, which requires the remote user to enter a user name and password. A FortiGate VPN server can act as an XAuth server to authenticate dialup users. A FortiGate unit that is a dialup client can also be configured as an XAuth client to authenticate itself to the VPN server.

For all the Phase 1 web-based manager fields, see IPsec VPN in the web-based manager.

If you want to control how IKE is negotiated when there is no traffic, as well as the length of time the unit waits for negotiations to occur, use the negotiation-timeout and auto-negotiate commands in the CLI.