ZyXEL Communications Prestige 661H Series, Руководство пользователя

Страница: 187 / 547

Prestige 661H/HW Series User’s Guide
187 Chapter 15 VPN Screens
Content The configuration of the peer content depends on the peer ID type.
For IP , type the IP address of the computer with which you will make the VPN
connection. If you configure this field to 0.0.0.0 or leave it blank, the Prestige will
use the address in the Secure Gateway Address field (refer to the Secure
Gateway Address field description).
For DNS or E-mail , type a domain name or e-mail address by which to identify the
remote IPSec router. Use up to 31 ASCII characters including spaces, although
trailing spaces are truncated. The domain name or e-mail address is for
identification purposes only and can be any string.
It is recommended that you type an IP address other than
0.0.0.0 or use the DNS
or E-mail ID type in the following situations:
When there is a NAT router between the two IPSec routers.
When you want the Prestige to distinguish between VPN connection requests that
come in from remote IPSec routers with dynamic WAN IP addresses.
Secure Gateway
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. Set this field to 0.0.0.0 if the
remote IPSec router has a dynamic WAN IP address (the Key Management field
must be set to IKE ).
In order to have more than one active rule with the Secure Gateway Address
field set to 0.0.0.0 , the ranges of the local IP addresses cannot overlap between
rules.
If you configure an active rule with
0.0.0.0 in the Secure Gateway Address field
and the LAN’s full IP address range as the local IP address, then you cannot
configure any other active rules with the Secure Gateway Address field set to
0.0.0.0 .
Security Protocol
VPN 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 below).
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.
Encryption
Algorithm
Select DES , 3DES , AES or NULL from the drop-down list box.
When you use one of these encryption algorithms for data communications, both
the sending device and the receiving device must use the same secret key, which
can be used to encrypt and decrypt the message or to generate and verify a
message authentication code. The DES encryption algorithm uses a 56-bit key.
Triple DES ( 3DES ) is a variation on DES that uses a 168-bit key. As a result,
3DES is more secure than DES . It also requires more processing power, resulting
in increased latency and decreased throughput. This implementation of AES uses
a 128-bit key. AES is faster than 3DES .
Select NULL to set up a tunnel without encryption. When you select NULL , you
do not enter an encryption key.
Table 58 VPN IKE (continued)
LABEL DESCRIPTION