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Prestige 794M User’s Guide
Chapter 7 VPN 90
7.4.1.2 LAN to LAN L2TP Connection
Use the L2TP LAN to LAN screen to create an L2TP VPN rule to connect to another VPN
device on the LAN.
Encryption Select the encryption method from the pull-down menu. There are four
options, DES, 3DES, AES and NONE. NONE means it is a tunnel only with no
encryption. 3DES and AES are more powerful but increase latency.
• DES stands for Data Encryption Standard, it uses 56 bits as an encryption
method.
•3DES stands for Triple Data Encryption Standard, it uses 168 (56*3) bits
as an encryption method.
• AES stands for Advanced Encryption Standards, it uses 128 bits as an
encryption method.
Perfect Forward
Secrecy
Perfect Forward Secret (PFS) is disabled (None) by default in phase 2 IPSec
SA setup. This allows faster IPSec setup, but is not so secure.
Specify an MODP (Modular Exponentiation Groups) mode from the drop-
down list box. Choices are MODP 768-bit (Group 1), MODP 1024-bit (Group
2) and MODP 1536-bit (Group 5). The larger the random number bits, the
higher the security ut slower.
Pre-shared Key Enter 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.
Note: 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.
Remote Host Name This optional field is applicable when you select Dial Out in the Type field
above.
Enter the host name of the remote VPN device. The name must match to
establish a VPN connection.
Local Host Name This field is optional.
Enter the host name of the Prestige.
Tunnel Authentication Select this option to set the Prestige to authenticate both the remote L2TP
client and host. The remote L2TP client and host must also support this
feature.
Secret This field is applicable when you select Tunnel Authentication above.
Enter the authentication key up to 16 alphanumerical characters.
Apply Click Apply after changing settings.
Table 46 VPN: L2TP: Create: Remote Access Connection (continued)
LABEL DESCRIPTION