Netgear FVS318v1 – Prosafe Wireless N VPN Firewall Reference Manual

D-10

Virtual Private Networking

2.

IKE Phase I. 

a.

The two parties negotiate the encryption and authentication algorithms to use in the IKE 
SAs. 

b.

The two parties authenticate each other using a predetermined mechanism, such as 
preshared keys or digital certificates.

c.

A shared master key is generated by the Diffie-Hellman Public key algorithm within the 
IKE framework for the two parties. The master key is also used in the second phase to 
derive IPSec keys for the SAs.

3.

IKE Phase II. 

a.

The two parties negotiate the encryption and authentication algorithms to use in the IPSec 
SAs.

b.

The master key is used to derive the IPSec keys for the SAs. Once the SA keys are created 
and exchanged, the IPSec SAs are ready to protect user data between the two VPN 
gateways.

4.

Data transfer. Data is transferred between IPSec peers based on the IPSec parameters and 
keys stored in the SA database.

5. IPSec tunnel termination. IPSec SAs terminate through deletion or by timing out.

It is important to remember that both gateways must have the identical parameters set for the 
process to work correctly. The settings in these TechNote examples follow the examples given for 
Scenario 1 of the VPN Consortium.

The IKE Phase 1 parameters used: 

•

Main  mode 

•

TripleDES

•

SHA-1

•

MODP group 1 

•

pre-shared secret of "hr5xb84l6aa9r6" 

•

SA lifetime of 28800 seconds (eight hours)