Filter
Top Products
Prestige 652 ADSL Security Router
25-16 VPN/IPSec Setup
Table 25-5
Menu 27.1.1.1
—
IKE Setup
FIELD DESCRIPTION EXAMPLE
Press [SPACE BAR] to choose from
3DES
or
DES
and then press [ENTER].
Authentication
Algorithm
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 slightly slower.
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 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
,
3DES
or
DES
and then press
[ENTER]. Select
NULL
to set up a tunnel without encryption.
DES
Authentication
Algorithm
Press [SPACE BAR] to choose from
SHA1
or
MD5
and then press [ENTER].
SHA1
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).
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.