Autoike ipsec vpns – Fortinet FortiGate 50A User Manual

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Fortinet Inc.

AutoIKE IPSec VPNs

IPSec VPN

Enter the Remote Gateway.
This is the external IP address of the FortiGate unit or other IPSec gateway at the
opposite end of the tunnel.

Select an Encryption Algorithm from the list.
Use the same algorithm at both ends of the tunnel.

Enter the Encryption Key.
Each two-character combination entered in hexadecimal format represents one byte.
Depending on the encryption algorithm that you select, you might be required to enter
the key in multiple segments. Use the same encryption key at both ends of the tunnel.

Select an Authentication Algorithm from the list.
Use the same algorithm at both ends of the tunnel.

Enter the Authentication Key.
Each two-character combination entered in hexadecimal format represents one byte.
Use the same authentication key at both ends of the tunnel.

Select a concentrator if you want the tunnel to be part of a hub and spoke VPN
configuration. See

“Adding a VPN concentrator” on page 198

Select OK to save the manual key VPN tunnel.

AutoIKE IPSec VPNs

FortiGate units support two methods of Automatic Internet Key Exchange (AutoIKE)
for establishing IPSec VPN tunnels: AutoIKE with pre-shared keys and AutoIKE with
digital certificates.

•

General configuration steps for an AutoIKE VPN

•

Adding a phase 1 configuration for an AutoIKE VPN

•

Adding a phase 2 configuration for an AutoIKE VPN

DES

Enter a 16-character (8 byte) hexadecimal number (0-9, A-F).

3DES

Enter a 48-character (24 byte) hexadecimal number (0-9, A-F). Separate the

number into three segments of 16 characters.

AES128

Enter a 32-character (16 byte) hexadecimal number (0-9, A-F). Separate the

number into two segments of 16 characters.

AES192

Enter a 48-character (24 byte) hexadecimal number (0-9, A-F). Separate the

number into three segments of 16 characters.

AES256

Enter a 64-character (32 byte) hexadecimal number (0-9, A-F). Separate the

number into four segments of 16 characters.

MD5

Enter a 32-character (16 byte) hexadecimal number (0-9, A-F). Separate the

number into two segments of 16 characters.

SHA1

Enter a 40-character (20 byte) hexadecimal number (0-9, A-F). Separate the

number into two segments—the first of 16 characters; the second of 24

characters.