Netgear DGB111G Operations Instructions download pdf (Page 232)

Reference Manual for the Model Wireless ADSL Firewall Router DG834G

E-10 Virtual Private Networking

202-10006-05, June 2005

1. The IPSec software on Host A initiates the IPSec process in an attempt to communicate

with Host B. The two computers then begin the Internet Key Exchange (IKE) process.

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.

VPNC IKE Security Parameters

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.

VPNC IKE Phase I Parameters

The IKE Phase 1 parameters used:

•Main mode

•TripleDES

• SHA-1

• MODP group 1

• pre-shared secret of "hr5xb84l6aa9r6"

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Netgear DGB111G Operations Instructions Page 232