ZyXEL Communications ZyWall ATP series User Manual page 390

Table 156 Configuration > VPN > IPSec VPN > VPN Connection > Add/Edit (continued)
LABEL DESCRIPTION
First DNS Server The Domain Name System (DNS) maps a domain name to an IP address and vice versa.
(optional)
The Zyxel Device uses these (in the order you specify here) to resolve domain names for
VPN. Enter a DNS server's IP address.
Second DNS Server Enter a secondary DNS server's IP address that is checked if the first one is unavailable.
(Optional)
First WINS Server Type the IP address of the WINS (Windows Internet Naming Service) server that you want
(Optional)
to send to the DHCP clients. The WINS server keeps a mapping table of the computer
names on your network and the IP addresses that they are currently using.
Second WINS Enter a secondary WINS server's IP address that is checked if the first one is unavailable.
Server (Optional)
Phase 2 Settings
SA Life Time Type the maximum number of seconds the IPSec SA can last. Shorter life times provide
better security. The Zyxel Device automatically negotiates a new IPSec SA before the
current one expires, if there are users who are accessing remote resources.
Active Protocol Select which protocol you want to use in the IPSec SA. Choices are:
AH (RFC 2402) - provides integrity, authentication, sequence integrity (replay resistance),
and non-repudiation but not encryption. If you select AH, you must select an
Authentication algorithm.
ESP (RFC 2406) - provides encryption and the same services offered by AH, but its
authentication is weaker. If you select ESP, you must select an Encryption algorithm and
Authentication algorithm.
Both AH and ESP increase processing requirements and latency (delay).
The Zyxel Device and remote IPSec router must use the same active protocol.
Encapsulation Select which type of encapsulation the IPSec SA uses. Choices are
Tunnel - this mode encrypts the IP header information and the data.
Transport - this mode only encrypts the data.
The Zyxel Device and remote IPSec router must use the same encapsulation.
Proposal Use this section to manage the encryption algorithm and authentication algorithm pairs
the Zyxel Device accepts from the remote IPSec router for negotiating the IPSec SA.
Add Click this to create a new entry.
Edit Select an entry and click this to be able to modify it.
Remove Select an entry and click this to delete it.
# This field is a sequential value, and it is not associated with a specific proposal. The
sequence of proposals should not affect performance significantly.
Chapter 20 IPSec VPN
ZyWALL ATP Series User's Guide
390