Prestige 662HW Series User’s Guide
42-10
VPN/IPSec Setup
Table 42-3
Menu 27.1.1.1 IKE Setup
FIELD DESCRIPTION
EXAMPLE
SA Life Time
(Seconds)
Define the length of time before an IKE Security Association 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.
28800
(default)
Key Group You must choose a key group for phase 1 IKE setup.
DH1
(default)
refers to
Diffie-Hellman Group 1 a 768 bit random number.
DH2
refers to Diffie-Hellman
Group 2 a 1024 bit (1Kb) random number.
DH1
Phase 2
Active Protocol Press [SPACE BAR] to choose from
ESP
or
AH
and then press [ENTER]. See
earlier for a discussion of these protocols.
ESP
Encryption
Algorithm
Press [SPACE BAR] to choose from
NULL
,
DES
,
3DES
or
AES
and then press
[ENTER]. Select
NULL
to set up a tunnel without encryption.
AES
Authentication
Algorithm
Press [SPACE BAR] to choose from
SHA1
or
MD5
and then press [ENTER].
MD5
SA Life Time
(Seconds)
Define the length of time before an IPSec Security Association automatically
renegotiates in this
field. It
may range from 60 to 3,000,000 seconds (almost 35
days).
28800
(default)
Encapsulation Press [SPACE BAR] to choose from
Tunnel
mode
or
Transport
mode and then
press [ENTER]. See earlier for a discussion of these.
Tunnel
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. Press [SPACE BAR]
and choose from
DH1
or
DH2
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).
None
When you have completed this menu, press [ENTER] at the prompt “Press ENTER to Confirm…” to save your
configuration, or press [ESC] at any time to cancel.
42.5 Manual Setup
You only configure
Menu 27.1.1.2 – Manual Setup
when you select
Manual
in the
Key
Management
field in
Menu 27.1.1 – IPSec Setup
. Manual key management is useful if you have
problems with
IKE
key management.
42.5.1 Active Protocol
This field is a combination of mode and security protocols used for the VPN. See the Web
Configurator part on VPN for more information on these parameters.
Table 42-4 Active Protocol: Encapsulation and Security Protocol
MODE SECURITY
PROTOCOL
Tunnel ESP
Transport AH
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