Netgear UTM50-100NAS User Manual

Virtual Private Networking Using IPsec Connections

7-43

To simplify the process of connecting remote VPN clients to the UTM, use the Mode Config 
feature to assign IP addresses to remote users, including a network access IP address, subnet mask, 
WINS server, and DNS address from the UTM. Remote users are given IP addresses available in a 
secured network space so that remote users appear as seamless extensions of the network.

After the IKE Phase 1 negotiation is complete, the VPN connection initiator (which is the remote 
user with a VPN client) requests the IP configuration settings such as the IP address, subnet mask, 
WINS server, and DNS address from the UTM. The Mode Config feature allocates an IP address 
from the configured IP address pool and activates a temporary IPsec policy, using the information 
that is specified in the Traffic Tunnel Security Level section of the Mode Config record (on the 
Add Mode Config Record screen that is shown in 

To configure Mode Config on the UTM, you first must create a Mode Config record, and then 
select the Mode Config record for an IKE policy:

1. Select VPN > IPSec VPN from the menu. The IPsec VPN submenu tabs appear with the IKE 

Policies screen in view.

Note: You select the RADIUS authentication protocol (PAP or CHAP) on the Edit 

IKE Policy screen or Add IKE Policy screen (see 

).

Note: After configuring a Mode Config record, you must manually configure an IKE 

policy and select the newly-created Mode Config record from the ‘Select Mode 
Config Record’ pull-down menu (see 

. You do not need to make changes to any VPN policy.

Note: An IP address that is allocated to a VPN client is released only after the VPN client 

has gracefully disconnected or after the SA liftetime for the connection has timed 
out.