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Chapter 15 IPSec VPN

NBG420N User’s Guide

175

The following table describes the labels in this screen.

Table 64 Security > VPN > Rule Setup: IKE (Advanced)

LABEL DESCRIPTION

Property

Active Select this check box to activate this VPN policy.

Keep Alive Select this check box to have the NBG420N automatically reinitiate the SA after

the SA lifetime times out, even if there is no traffic. The remote IPSec router

must also have keep alive enabled in order for this feature to work.

NAT Traversal Select this check box to enable NAT traversal. NAT traversal allows you to set

up a VPN connection when there are NAT routers between the two IPSec

routers.

Note: The remote IPSec router must also have NAT traversal

enabled.

You can use NAT traversal with ESP protocol using Transport or Tunnel mode,

but not with AH protocol nor with manual key management. In order for an

IPSec router behind a NAT router to receive an initiating IPSec packet, set the

NAT router to forward UDP ports 500 and 4500 to the IPSec router behind the

NAT router.

IPSec Keying Mode Select IKE or Manual from the drop-down list box. IKE provides more

protection so it is generally recommended. Manual is a useful option for

troubleshooting if you have problems using IKE key management.

Protocol Number Enter 1 for ICMP, 6 for TCP, 17 for UDP, etc. 0 is the default and signifies any

protocol.

Enable Replay

Detection

As a VPN setup is processing intensive, the system is vulnerable to Denial of

Service (DoS) attacks The IPSec receiver can detect and reject old or duplicate

packets to protect against replay attacks. Select Yes from the drop-down menu

to enable replay detection, or select No to disable it.

DNS Server (for

IPSec VPN)

If there is a private DNS server that services the VPN, type its IP address here.

The NBG420N assigns this additional DNS server to the NBG420N's DHCP

clients that have IP addresses in this IPSec rule's range of local addresses.

A DNS server allows clients on the VPN to find other computers and servers on

the VPN by their (private) domain names.

Local Policy Local IP addresses must be static and correspond to the remote IPSec router's

configured remote IP addresses.

Two active SAs can have the same configured local or remote IP address, but

not both. You can configure multiple SAs between the same local and remote IP

addresses, as long as only one is active at any time.

In order to have more than one active rule with the Secure Gateway Address

field set to 0.0.0.0, the ranges of the local IP addresses cannot overlap between

rules.

If you configure an active rule with 0.0.0.0 in the Secure Gateway Address

field and the LAN’s full IP address range as the local IP address, then you

cannot configure any other active rules with the Secure Gateway Address field

set to 0.0.0.0.

Local Address For a single IP address, enter a (static) IP address on the LAN behind your

NBG420N.

For a specific range of IP addresses, enter the beginning (static) IP address, in

a range of computers on your LAN behind your NBG420N.

To specify IP addresses on a network by their subnet mask, enter a (static) IP

address on the LAN behind your NBG420N.

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ZyXEL NBG420N Manuel d'utilisateur Page 175

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