ZyXEL Communications SBG3500-N000 User Manual page 265

Table 89 VPN > IPSec VPN > Setup > Edit (continued)
LABEL
Encryption
Authentication
Perfect Forward
Secrecy (PFS)
Policy
Local IP Type
Local IP Address
Local Subnet Mask
Remote IP Type
Remote IP Address
Remote Subnet
Mask
Force SBG Go VPN
Tunnel
Apply
Cancel
SBG3500-N000 User's Guide
DESCRIPTION
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
AES192 - a 192-bit key with the AES encryption algorithm
AES256 - a 256-bit key with the AES encryption algorithm
The SBG3500-N and the remote IPSec router must use the same algorithms and keys.
Longer keys require more processing power, resulting in increased latency and
decreased throughput.
Select which hash algorithm to use to authenticate packet data in the IKE SA. Choices
are SHA1 and MD5. SHA1 is generally considered stronger than MD5, but it is also
slower.
Select whether or not you want to enable Perfect Forward Secrecy (PFS) and, if you do,
which Diffie-Hellman key group to use for encryption. Choices are:
DH1 - enable PFS and use a 768-bit random number
DH2 - enable PFS and use a 1024-bit random number
DH5 - enable PFS and use a 1536-bit random number
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.
Select the IP type of the local device that is linked to the IPSec router.
• Subnet - you will need to enter the network mask address
• Single - only a single PC (no LAN) at the remote endpoint
• Range - you will need to enter a starting IP address and a finishing IP address
Type the IP address of the device linked to the local IPSec router. This must match the
remote IP address configured on the remote IPSec device.
Type the subnet mask address of the device linked to the local IPSec router. This must
match the remote IP address configure on the remote IPSec device.
Choose the remote IP type of the device linked to the remote IPSec router.
• Subnet - you will need to enter the network mask address
• Single - only a single PC (no LAN) at the remote endpoint
• Range - you will need to enter a starting IP address and a finishing IP address
Type the IP address of the device linked to the remote IPSec router. This must match
the local IP address configured on the remote IPSec device.
Type the subnet mask address of a device linked to the remote IPSec router. This must
match the local IP address configured on the remote IPSec device.
Click this checkbox to force data traffic to go through VPN tunnel when its destination IP
address matches an entry in the IPSec VPN policy rule.
Click Apply to save your changes back to the SBG3500-N.
Click Cancel to restore your previous settings.
Chapter 20 IPSec VPN
265