ZyXEL Communications P-334 - Manual (Page 178)

Prestige 334 User’s Guide
177 Chapter 15 VPN Screens
Local Port End Type a port number in this field to define a port range. This port number must
be greater than that specified in the previous field. If Local Port Start is left at
0, Local Port End will also remain at 0.
Remote Address Start Remote IP addresses must be static and correspond to the remote IPSec
router's configured local IP addresses. The remote address fields do not
apply when the Secure Gateway IP Address field is configured to 0.0.0.0. In
this case only the remote IPSec router can initiate the VPN.
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.
Enter a (static) IP address on the network behind the remote IPSec router.
Remote Address End/
Mask
When the remote IP address is a single address, type it a second time here.
When the remote IP address is a range, enter the end (static) IP address, in a
range of computers on the network behind the remote IPSec router.
When the remote IP address is a subnet address, enter a subnet mask on the
network behind the remote IPSec router.
Remote Port Start "0" is the default and signifies any port. Type a port number from 0 to 65535.
Some of the most common IP ports are: 21, FTP; 53, DNS; 23, Telnet; 80,
HTTP; 25, SMTP; 110, POP3.
Remote Port End Enter a port number in this field to define a port range. This port number must
be greater than that specified in the previous field. If Remote Port Start is left
at 0, Remote Port End will also remain at 0.
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.
My IP Address Enter the WAN IP address of your Prestige. The Prestige uses its current
WAN IP address (static or dynamic) in setting up the VPN tunnel if you leave
this field as 0.0.0.0. The VPN tunnel has to be rebuilt if this IP address
changes.
Secure Gateway IP
Address
Type the WAN IP address or the URL (up to 31 characters) of the IPSec
router with which you're making the VPN connection.
SPI Type a number (base 10) from 1 to 999999 for the Security Parameter Index.
Encapsulation Mode Select Tunnel mode or Transport mode from the drop-down list box.
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.
IPSec Protocol Select ESP if you want to use ESP (Encapsulation Security Payload). The
ESP protocol (RFC 2406) provides encryption as well as some of the services
offered by AH. If you select ESP here, you must select options from the
Encryption Algorithm and Authentication Algorithm fields (described
next).
Select AH if you want to use AH (Authentication Header Protocol). The AH
protocol (RFC 2402) was designed for integrity, authentication, sequence
integrity (replay resistance), and non-repudiation but not for confidentiality, for
which the ESP was designed. If you select AH here, you must select options
from the Authentication Algorithm field (described later).
Table 53 Rule Setup: Manual
LABEL DESCRIPTION