Prestige 652H/HW Series User’s Guide
16-22
VPN
Screens
Table 16-8 VPN IKE: Advanced Setup
LABEL
DESCRIPTION
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.
16.14 Configuring Manual Key
You only configure
VPN Manual Key
when you select
Manual
in the
IPSec Key Mode
field on the
VPN
IKE
screen. This is the
VPN Manual Key
screen as shown next.
Содержание Prestige 652H series
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Страница 173: ...Prestige 652H HW Series User s Guide Firewall Screens 13 11 Figure 13 5 Insert Append A Firewall Rule ...
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Страница 197: ...VPN IPSec V Part V VPN IPSec This part provides information about configuring VPN IPSec for secure communications ...
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Страница 214: ...Prestige 652H HW Series User s Guide 16 10 VPN Screens Figure 16 5 VPN IKE ...
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