NETGEAR UTM50-100NAS manual Description or Subfield and Description, Traffic Tunnel Security Level

ProSecure Unified Threat Management (UTM) Appliance Reference Manual

Table 7-15. Add Mode Config Record Settings (continued)

	Item	Description (or Subfield and Description)
	WINS Server	If there is a WINS server on the local network, enter its IP address in the
		Primary field. You can enter the IP address of a second WINS server in the
		Secondary field.
	DNS Server	Enter the IP address of the DNS server that is used by remote VPN clients in the
		Primary field. You can enter the IP address of a second DNS server in the
		Secondary field.
	Traffic Tunnel Security Level
	Note: Generally, the default setting work well for a Mode Config configuration.
	PFS Key Group	Select this checkbox to enable Perfect Forward Secrecy (PFS), and then select
		a Diffie-Hellman (DH) group from the pull-down menu. The DH Group sets the
		strength of the algorithm in bits. The higher the group, the more secure the
		exchange. From the pull-down menu, select one of the following three
		strengths:
		• Group 1 (768 bit).
		• Group 2 (1024 bit). This is the default setting.
		• Group 5 (1536 bit).
	SA Lifetime	The lifetime of the Security Association (SA) is the period or the amount of
		transmitted data after which the SA becomes invalid and must be renegotiated.
		From the pull-down menu, select how the SA lifetime is specified:
		• Seconds. In the SA Lifetime field, enter a period in seconds. The minimum
		value is 300 seconds. The default value is 3600 seconds.
		• KBytes. In the SA Lifetime field, enter a number of kilobytes. The minimum
		value is 1920000 KB.
	Encryption Algorithm	From the pull-down menu, select one of the following five algorithms to
		negotiate the security association (SA):
		• DES. Data Encryption Standard (DES)
		• 3DES. Triple DES. This is the default algorithm.
		• AES-128. Advanced Encryption Standard (AES) with a 128-bits key size.
		• AES-192. AES with a 192-bits key size.
		• AES-256. AES with a 256-bits key size.
	Integrity Algorithm	From the pull-down menu, select one of the following two algorithms to be used
		in the VPN header for the authentication process:
		• SHA-1. Hash algorithm that produces a 160-bit digest. This is the default
		setting.
		• MD5. Hash algorithm that produces a 128-bit digest.
	Local IP Address	The local IP address to which remote VPN clients have access. Typically, this is
		the UTM’s LAN subnet, such as 192.168.1.0.
		Note: If you do not specify a local IP address, the UTM’s default LAN subnet is
		used.
	Local Subnet Mask	The local subnet mask. Typically, this is 255.255.255.0.
7-46		Virtual Private Networking Using IPsec Connections

v1.0, January 2010