ZyXEL Communications Prestige 652, User Manual, Page: 200 / 521

Prestige 652 Series User’s Guide
17-16 VPN Screens
Table 17-8 VPN IKE: Advanced
LABEL DESCRIPTION
Enable Replay
Protection
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.
Local Start Port
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.
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
Local Start Port is left at 0, End
will also remain at 0.
Remote Start Port
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.
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 Start Port is left at 0,
End will also remain at 0.
Phase 1
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.
Pre-Shared Key
Type your pre-shared key in this field. A pre-shared key identifies a
communicating party during a phase 1 IKE negotiation. It is called "pre-shared"
because you have to share it with another party before you can communicate with
them over a secure connection.
Type from 8 to 31 case-sensitive ASCII characters or from 16 to 62 hexadecimal
("0-9", "A-F") characters. You must precede a hexadecimal key with a "0x” (zero
x), which is not counted as part of the 16 to 62-character range for the key. For
example, in "0x0123456789ABCDEF", “0x” denotes that the key is hexadecimal
and “0123456789ABCDEF” is the key itself.
Both ends of the VPN tunnel must use the same pre-shared key. You will receive
a “PYLD_MALFORMED” (payload malformed) packet if the same pre-shared key
is not used on both ends.