Chapter 30 IPSec VPN
UAG5100 User’s Guide
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Each field is described in the following table.
Table 132
Configuration > VPN > IPSec VPN > VPN Connection > Add/Edit
LABEL
DESCRIPTION
Show Advanced
Settings / Hide
Advanced Settings
Click this button to display a greater or lesser number of configuration fields.
Create new Object
Use to configure any new settings objects that you need to use in this screen.
General Settings
Enable
Select this check box to activate this VPN connection.
Connection Name
Type the name used to identify this IPSec SA. You may use 1-31 alphanumeric
characters, underscores(
_
), or dashes (-), but the first character cannot be a
number. This value is case-sensitive.
Nailed-Up
Select this if you want the UAG to automatically renegotiate the IPSec SA when the
SA life time expires.
Enable Replay
Detection
Select this check box to detect and reject old or duplicate packets to protect against
Denial-of-Service attacks.
Enable NetBIOS
Broadcast over
IPSec
Select this check box if you the UAG to send NetBIOS (Network Basic Input/Output
System) packets through the IPSec SA.
NetBIOS packets are TCP or UDP packets that enable a computer to connect to and
communicate with a LAN. It may sometimes be necessary to allow NetBIOS packets
to pass through IPSec SAs in order to allow local computers to find computers on the
remote network and vice versa.
MSS Adjustment
Select Custom Size to set a specific number of bytes for the Maximum Segment Size
(MSS) meaning the largest amount of data in a single TCP segment or IP datagram
for this VPN connection.
Select Auto to have the UAG automatically set the MSS for this VPN connection.
VPN Gateway
Application
Scenario
This field is read-only and shows the scenario that the UAG supports.
Site-to-site - The remote IPSec router needs to have a static IP address or a domain
name. This UAG can initiate the VPN tunnel.
VPN Gateway
Select the VPN gateway this VPN connection is to use or select Create new Object
to add another VPN gateway for this VPN connection to use.
Policy
Local Policy
Select the address corresponding to the local network. Use Create new Object if
you need to configure a new one.
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 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.
