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Table 93 IPSec VPN: Add
LABEL
Pre-Shared
Key
Certificates
Perfect
Forward
Secrecy (PFS)
Show
Advanced
Settings
Advanced Setting - Phase 1
Mode
Encryption
Algorithm
Integrity
Algorithm
Diffie-Hellman
Group for Key
Exchange
VMG1312-B10B / VMG1312-B30B Series User's Guide
DESCRIPTION
Type your pre-shared key in this field. A pre-shared key identifies a
communicating party during a phase 1 IKE negotiation.
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.
If you use a certificate for authentication, select the certificates to use from the
lists. You can import certificates in the Security > Certificates screens.
Select whether or not you want to enable Perfect Forward Secrecy (PFS)
PFS changes the root key that is used to generate encryption keys for each IPSec
SA. The longer the key, the more secure the encryption, but also the longer it
takes to encrypt and decrypt information. Both routers must use the same DH
key group. Choices are:
Diffie-Hellman Group2 - use a 1024-bit random number
Diffie-Hellman Group5 - use a 1536-bit random number
Diffie-Hellman Group14 - use a 2048-bit random number
Click this to display advanced settings.
Select the negotiation mode to use to negotiate the IKE SA. Choices are:
Main - this encrypts the Device's and remote IPSec router's identities but takes
more time to establish the IKE SA.
Aggressive - this is faster but does not encrypt the identities.
The Device and the remote IPSec router must use the same negotiation mode.
Select which key size and encryption algorithm to use in the IKE SA. Choices
are:
DES - a 56-bit key with the DES encryption algorithm
3DES - a 168-bit key with the DES encryption algorithm
AES128 - a 128-bit key with the AES encryption algorithm
AES196 - a 196-bit key with the AES encryption algorithm
AES256 - a 256-bit key with the AES encryption algorithm
The Device and the remote IPSec router must use the same key size and
encryption algorithm. Longer keys require more processing power, resulting in
increased latency and decreased throughput.
Select which hash algorithm to use to authenticate packet data. Choices are
MD5, SHA1, SHA2-256 and SHA2-512. SHA is generally considered stronger
than MD5, but it is also slower.
Select which Diffie-Hellman key group you want to use for encryption keys.
Choices for number of bits in the random number are: 768, 1024, 2048, 3072,
4096, 6144, 8192.
The longer the key, the more secure the encryption, but also the longer it takes
to encrypt and decrypt information. Both routers must use the same DH key
group.
Chapter 20 VPN
245
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