ZyXEL UAG715 User Guide - Page 260

Configuration > VPN > IPSec VPN > VPN Connection > Edit continued

Page 260 highlights

Chapter 22 IPSec VPN Table 102 Configuration > VPN > IPSec VPN > VPN Connection > Edit (continued) LABEL DESCRIPTION Policy Enforcement Clear this to allow traffic with source and destination IP addresses that do not match the local and remote policy to use the VPN tunnel. Leave this cleared for free access between the local and remote networks. Phase 2 Settings SA Life Time Active Protocol Selecting this restricts who can use the VPN tunnel. The UAG drops traffic with source and destination IP addresses that do not match the local and remote policy. Type the maximum number of seconds the IPSec SA can last. Shorter life times provide better security. The UAG automatically negotiates a new IPSec SA before the current one expires, if there are users who are accessing remote resources. Select which protocol you want to use in the IPSec SA. Choices are: AH (RFC 2402) - provides integrity, authentication, sequence integrity (replay resistance), and non-repudiation but not encryption. If you select AH, you must select an Authentication algorithm. ESP (RFC 2406) - provides encryption and the same services offered by AH, but its authentication is weaker. If you select ESP, you must select an Encryption algorithm and Authentication algorithm. Both AH and ESP increase processing requirements and latency (delay). Encapsulation The UAG and remote IPSec router must use the same active protocol. Select which type of encapsulation the IPSec SA uses. Choices are Tunnel - this mode encrypts the IP header information and the data. Transport - this mode only encrypts the data. Proposal Add Edit Remove # Encryption The UAG and remote IPSec router must use the same encapsulation. Use this section to manage the encryption algorithm and authentication algorithm pairs the UAG accepts from the remote IPSec router for negotiating the IPSec SA. Click this to create a new entry. Select an entry and click this to be able to modify it. Select an entry and click this to delete it. This field is a sequential value, and it is not associated with a specific proposal. The sequence of proposals should not affect performance significantly. This field is applicable when the Active Protocol is ESP. Select which key size and encryption algorithm to use in the IPSec SA. Choices are: NULL - no encryption key or algorithm 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 UAG and the remote IPSec router must both have at least one proposal that uses use the same encryption and the same key. Longer keys are more secure, but require more processing power, resulting in increased latency and decreased throughput. 260 UAG715 User's Guide

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Chapter 22 IPSec VPN
UAG715 User’s Guide
260
Policy Enforcement
Clear this to allow traffic with source and destination IP addresses that do not match
the local and remote policy to use the VPN tunnel. Leave this cleared for free access
between the local and remote networks.
Selecting this restricts who can use the VPN tunnel. The UAG drops traffic with source
and destination IP addresses that do not match the local and remote policy.
Phase 2 Settings
SA Life Time
Type the maximum number of seconds the IPSec SA can last. Shorter life times
provide better security. The UAG automatically negotiates a new IPSec SA before the
current one expires, if there are users who are accessing remote resources.
Active Protocol
Select which protocol you want to use in the IPSec SA. Choices are:
AH
(RFC 2402) - provides integrity, authentication, sequence integrity (replay
resistance), and non-repudiation but not encryption. If you select
AH
, you must
select an
Authentication
algorithm.
ESP
(RFC 2406) - provides encryption and the same services offered by
AH
, but its
authentication is weaker. If you select
ESP
, you must select an
Encryption
algorithm
and
Authentication
algorithm.
Both
AH
and
ESP
increase processing requirements and latency (delay).
The UAG and remote IPSec router must use the same active protocol.
Encapsulation
Select which type of encapsulation the IPSec SA uses. Choices are
Tunnel
- this mode encrypts the IP header information and the data.
Transport
- this mode only encrypts the data.
The UAG and remote IPSec router must use the same encapsulation.
Proposal
Use this section to manage the encryption algorithm and authentication algorithm
pairs the UAG accepts from the remote IPSec router for negotiating the IPSec SA.
Add
Click this to create a new entry.
Edit
Select an entry and click this to be able to modify it.
Remove
Select an entry and click this to delete it.
#
This field is a sequential value, and it is not associated with a specific proposal. The
sequence of proposals should not affect performance significantly.
Encryption
This field is applicable when the
Active Protocol
is
ESP
. Select which key size and
encryption algorithm to use in the IPSec SA. Choices are:
NULL
- no encryption key or algorithm
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 UAG and the remote IPSec router must both have at least one proposal that uses
use the same encryption and the same key.
Longer keys are more secure, but require more processing power, resulting in
increased latency and decreased throughput.
Table 102
Configuration > VPN > IPSec VPN > VPN Connection > Edit (continued)
LABEL
DESCRIPTION