IPSec Setup, IKE with Preshared Key | Cisco Systems RV042RF manual

Chapter 4

Advanced Configuration

Remote Security Gateway Type > Dynamic IP + Domain Name(FQDN)

Authentication

DomainName Enterthedomainnameforauthentication. (Once used, you cannot use it again to create a new tunnel connection.)

Dynamic IP + E-mail Addr.(USER FQDN) Authentication

The Remote Security Gateway will be a dynamic IP address, so you do not need to enter the IP address. When the Remote Security Gateway requests to create a tunnel with the Router, the Router will work as a responder.

Remote Security Gateway Type > Dynamic IP + E-mail Addr.(USER

FQDN) Authentication

E-mail address Enter the e-mail address for authentication.

Remote Security Group Type

Select the Remote Security Group behind the Remote Gateway that can use this VPN tunnel. Select the type you want to use: IP, Subnet, or IP Range. Follow the instructions for the type you want to use.

NOTE: The Remote Security Group Type you select should match the Local Security Group Type selected on the VPN device at the other end of the tunnel.

After you have selected the Remote Security Group Type, the settings available on this screen may change, depending on which selection you have made.

Only the computer with a specific IP address will be able to access the tunnel.

Remote Security Group Type > IP

IP address Enter the appropriate IP address. Subnet

The default is Subnet. All computers on the remote subnet will be able to access the tunnel.

Remote Security Group Type > Subnet

IP address Enter the IP address.

Subnet Mask Enter the subnet mask. The default is 255.255.255.0.

IP Range

Specify a range of IP addresses within a subnet that will be able to access the tunnel.

Remote Security Group Type > IP Range

IP range Enter the range of IP addresses.

IPSec Setup

In order for any encryption to occur, the two ends of a VPN tunnel must agree on the methods of encryption, decryption, and authentication. This is done by sharing a key to the encryption code. For key management, the default mode is IKE with Preshared Key.

Keying Mode Select IKE with Preshared Key or Manual. Both ends of a VPN tunnel must use the same mode of key management. After you have selected the mode, the settings available on this screen may change, depending on the selection you have made. Follow the instructions for the mode you want to use.

IKE with Preshared Key

IKE is an Internet Key Exchange protocol used to negotiate key material for Security Association (SA). IKE uses the Preshared Key to authenticate the remote IKE peer.

Phase 1 DH Group Phase 1 is used to create the SA. DH (Diffie-Hellman) is a key exchange protocol used during Phase 1 of the authentication process to establish pre- shared keys. There are three groups of different prime key lengths. Group 1 is 768 bits, and Group 2 is 1,024 bits. Group 5 is 1,536 bits. If network speed is preferred, select Group 1. If network security is preferred, select Group 5.

Phase 1 Encryption Select a method of encryption: DES (56-bit), 3DES (168-bit), AES-128(128-bit), AES-192(192- bit), or AES-256(256-bit). The method determines the length of the key used to encrypt or decrypt ESP packets. AES-256 is recommended because it is the most secure. Make sure both ends of the VPN tunnel use the same encryption method.

Phase 1 Authentication Select a method of authentication, MD5 or SHA. The authentication method determines how the ESP packets are validated. MD5 is

10/100 4-Port VPN Router