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Chapter 11 IPSec VPN
The following table describes the fields in this screen.
Table 52 VPN > Setup > Edit
LABEL
IPSec Setup
Active
Keep Alive
NAT Traversal
Name
IPSec Key Mode
Negotiation Mode
Encapsulation
Mode
DNS Server (for
IPSec VPN)
Local
Local Address
Type
IP Address Start
164
DESCRIPTION
Select this check box to activate this VPN policy. This option determines whether
a VPN rule is applied before a packet leaves the firewall.
Select either Yes or No from the drop-down list box.
Select Yes to have the ZyXEL Device 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.
Select this check box if you want to set up a VPN tunnel when there are NAT
routers between the ZyXEL Device 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 ZyXEL Device 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 ZyXEL Device assigns this additional DNS server to the ZyXEL Device'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 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.
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 ZyXEL Device. 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 ZyXEL Device. When the Local Address
Type field is configured to Subnet, this is a (static) IP address on the LAN behind
your ZyXEL Device.
P-793H User's Guide
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Troubleshooting
