ZyXEL UAG4100 User Guide - Page 343
Table 156, Label, Description
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Chapter 30 IPSec VPN Each field is described in the following table. Table 156 Configuration > VPN > IPSec VPN > VPN Connection > Add/Edit LABEL Show Advanced Settings / Hide Advanced Settings Create new Object General Settings Enable Connection Name Nailed-Up Enable Replay Detection Enable NetBIOS Broadcast over IPSec MSS Adjustment DESCRIPTION Click this button to display a greater or lesser number of configuration fields. Use to configure any new settings objects that you need to use in this screen. Select this check box to activate this VPN connection. 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. Select this if you want the UAG to automatically renegotiate the IPSec SA when the SA life time expires. Select this check box to detect and reject old or duplicate packets to protect against Denial-of-Service attacks. 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. 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. Phase 2 Settings SA Life Time 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. UAG Series User's Guide 343