ZyXEL Communications P-792H User Manual page 161

Table 44 Security > VPN > Setup > Edit
LABEL
NAT Traversal
Name
IPSec Key Mode
Negotiation
Mode
Encapsulation
Mode
DNS Server (for
IPSec VPN)
Local
Local Address
Type
IP Address Start
End / Subnet
Mask
P-792H v2 User's Guide
DESCRIPTION
This function is available if the VPN Protocol is ESP.
Select this check box if you want to set up a VPN tunnel when there are
NAT routers between the P-792H v2 and remote IPSec router. The
remote IPSec router must also enable NAT traversal, and the NAT
routers have to forward UDP port 500 packets to the remote IPSec
router behind the NAT router.
Type up to 32 characters to identify this VPN policy. You may use any
character, including spaces, but the P-792H v2 drops trailing spaces.
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.
Select Main or Aggressive from the drop-down list box. Multiple SAs
connecting through a secure gateway must have the same negotiation
mode.
Select Tunnel mode or Transport mode from the drop-down list box.
If there is a private DNS server that services the VPN, type its IP
address here. The P-792H v2 assigns this additional DNS server to the
P-792H v2'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.
Specify the IP addresses of the devices behind the P-792H v2 that can
use the VPN tunnel. The local IP addresses must correspond to the
remote IPSec router's configured remote IP addresses.
Two active SAs cannot have the local and remote IP address(es) both
the same. Two active SAs can have the same 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.
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.
When the Local Address Type field is configured to Single, enter a
(static) IP address on the LAN behind your P-792H v2. 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 P-
792H v2. When the Local Address Type field is configured to
Subnet, this is a (static) IP address on the LAN behind your P-792H
v2.
When the Local Address Type field is configured to Single, this field
is N/A. When the Local Address Type field is configured to Range,
enter the end (static) IP address, in a range of computers on the LAN
behind your P-792H v2. When the Local Address Type field is
configured to Subnet, this is a subnet mask on the LAN behind your P-
792H v2.
Chapter 12 VPN
161