ZyXEL Communications 662HW Series - Manual (Page 228)

Prestige 662H/HW Series User’s Guide
Chapter 19 VPN Screens 228
Table 72 VPN IKE
LABEL DESCRIPTION
IPSec Setup
Active Select this check box to activate this VPN policy. This option determines whether
a VPN rule is applied before a packet leaves the firewall.
Keep Alive Select either Yes or No from the drop-down list box.
Select Yes to have the Prestige 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.
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 port 500 to the IPSec router behind the NAT router.
Name Type up to 32 characters to identify this VPN policy. You may use any character,
including spaces, but the Prestige drops trailing spaces.
IPSec Key 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.
Negotiation Mode Select Main or Aggressive from the drop-down list box. Multiple SAs connecting
through a secure gateway must have the same negotiation mode.
Encapsulation
Mode
Select Tunnel mode or Transport mode from the drop-down list box.
DNS Server (for
IPSec VPN)
If there is a private DNS server that services the VPN, type its IP address here.
The Prestige assigns this additional DNS server to the Prestige'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 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 Type Use the drop-down menu to choose Single, Range, or Subnet. Select Single for
a single IP address. Select Range for a specific range of IP addresses. Select
Subnet to specify IP addresses on a network by their subnet mask.
IP Address Start When the Local Address Type field is configured to Single, enter a (static) IP
address on the LAN behind your Prestige. When the Local Address Type field is
configured to Range, enter the beginning (static) IP address, in a range of
computers on your LAN behind your Prestige. When the Local Address Type
field is configured to Subnet, this is a (static) IP address on the LAN behind your
Prestige.