ZyXEL Communications 792H - Manual (Page 195)

Prestige 792H G.SHDSL Router
VPN Screens 14-17
Table 14-8 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.