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Chapter 20 IPSec VPN
ZyWALL 110/310/1100 Series User’s Guide
289
Remote Policy Select the address corresponding to the remote network. Use Create new Object if
you need to configure a new one.
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 ZyWALL 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 ZyWALL 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 ZyWALL 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 ZyWALL and remote IPSec router must use the same encapsulation.
Proposal Use this section to manage the encryption algorithm and authentication algorithm
pairs the ZyWALL 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 ZyWALL 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 107 Configuration > VPN > IPSec VPN > VPN Connection > Edit (continued)
LABEL DESCRIPTION