ZyXEL Communications Prestige 662HW Series, Руководство пользователя

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Prestige 662HW Series User’s Guide
VPN Screens 16-17
Table 16-8 VPN IKE: Advanced Setup
LABEL DESCRIPTION
Encryption Algorithm This field is available when you select ESP in the Active Protocol field.
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.
Authentication
Algorithm Select SHA1 or MD5 from the drop-down list box. MD5 (Message Digest 5) and SHA1
(Secure Hash Algorithm) are hash algorithms used to authenticate packet data. The
SHA1 algorithm is generally considered stronger than MD5, but is slower. Select
MD5 for
minimal security and SHA-1 for maximum security.
SA Life Time
(Seconds) Define the length of time before an IKE SA automatically renegotiates in this field. It may
range from 60 to 3,000,000 seconds (almost 35 days).
A short SA Life Time increases security by forcing the two VPN gateways to update the
encryption and authentication keys. However, every time the VPN tunnel renegotiates, all
users accessing remote resources are temporarily disconnected.
Encapsulation Select Tunnel mode or Transport mode from the drop-down list box.
Perfect Forward
Secrecy (PFS)
Perfect Forward Secrecy (PFS) is disabled ( NONE ) by default in phase 2 IPSec SA
setup. This allows faster IPSec setup, but is not so secure. Choose DH1 or DH2 from the
drop-down list box to enable PFS. DH1 refers to Diffie-Hellman Group 1 a 768 bit random
number. DH2 refers to Diffie-Hellman Group 2 a 1024 bit (1Kb) random number (more
secure, yet slower).
Apply Click Apply to save your changes back to the Prestige and return to the VPN-IKE screen.
Cancel Click Cancel to return to the VPN-IKE screen without saving your changes.
16.13 Manual Key Setup
Manual key management is useful if you have problems with IKE key management.
16.13.1 Security Parameter Index (SPI)
An SPI is used to distinguish different SAs terminating at the same destination and using the same
IPSec protocol. This data allows for the multiplexing of SAs to a single gateway. The
SPI (Security
Parameter Index) along with a destination IP address uniquely identify a particular Security
Association (SA). The
SPI is transmitted from the remote VPN gateway to the local VPN gateway.
The local VPN gateway then uses the network, encryption and key values that the administrator
associated with the SPI to establish the tunnel.
Current ZyXEL implementation assumes identical outgoing and incoming SPIs.