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Page 46 / 72 Scroll up to view Page 41 - 45
Configuring Your Gateway
5. To change the settings for a customer-defined service, click the radio button to the left of
the service you want to change and click the
Edit
button. When the Customer Defined
Service menu appears, edit the settings as necessary (see Table 10) and click
Apply
.
Click
Apply
in the LAN Settings menu to save your settings.
6. To delete a customer-defined service, click the radio button to the left of the service you
want to delete and click the
Delete
button. No precautionary message appears before you
delete a customer-defined service, so be sure you no longer need the service before you
delete it. Click
Apply
in the LAN Settings menu to save your settings.
Figure 26. Customer Defined Service Menu
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Configuring Your Gateway
Table 13. Customer Defined Service Page Options
Option
Description
Name
Name for identifying the custom service. The name is for reference purposes only.
Type
The type of protocol. Choices are TCP, UDP, and TCP/UDP. Default is TCP.
LAN Server IP
IP address of the LAN PC or server that is running the service.
Remote IPs
Forwards the service to any remote IP address, one remote IP address, or a range of remote IP
addresses.
Start IP
To specify:
•
A single remote IP address, enter the remote IP address.
•
A range of remote IP addresses, enter the starting IP address here and the ending IP address range in
the next field.
This field is unavailable if the Gateway is configured for any remote IP addresses.
End IP
Ending IP address in the remote IP address range. This field is unavailable if the Gateway is configured for
any remote IP addresses or a single remote IP address.
Public IP Ports
A single public IP port or a range of public IP ports on which the service is provided. If necessary, contact
the application vendor for this information.
Start Public Port
Starting number of the port on which the service is provided.
End Public Port
Ending number of the port on which the service is provided. This field is unavailable if the Gateway is
configured for a single public IP port.
Private Ports
Numbers of the ports whose traffic the Gateway forwards to the LAN. If there is a range of ports, enter the
starting private port here and check
Enable Port Range
. The Gateway automatically calculates the end
private port. The LAN PC server listens for traffic/data on this port (or these ports).
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Configuring Your Gateway
Security Settings (Firewall) Menu
The Security Settings (Firewall) menu lets you enable or disable the Gateway’s firewall. In
addition, the submenus associated with this menu let you:
y
Configure access control settings
⎯
see page 49
y
Configure your Gateway for special applications
⎯
see page 49
y
Set up URL blocking
⎯
see page 52
y
Schedule routes
⎯
see page 54
y
Receive email or syslog alert notifications
⎯
see page 55
y
Configure a local client computer as a local DMZ for unrestricted two-way Internet
access
⎯
see page 58
Enabling or Disabling Firewall
The Security Settings (Firewall) menu provides an option for enabling or disabling the
Gateway’s firewall setting. To access the Security Settings (Firewall) menu, click
Firewall
in
the menu bar. Figure 27 shows an example of the menu.
By default, your Gateway’s firewall settings are enabled. To disable the firewall, uncheck
Enable Firewall Mode
.
Figure 27. Firewall Settings (Security) Menu
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Configuring Your Gateway
Configuring Access Control
The Access Control menu lets you enable access control to block traffic at the Gateway's
LAN interfaces from accessing the Internet.
To access the Access Control menu, click
Firewall
in the menu bar and then click the
Access Control
submenu in the menu bar.
By default, your Gateway does not block attempts to access the LAN from the Internet. To
enable access control, check
Enable Access Control.
Figure 28. Access Control Menu
Configuring Special Applications
Using the Special Application menu, you can configure your Gateway to detect port triggers
for detect multiple-session applications and allow them to pass the firewall. For special
applications, besides the initial communication session, there are multiple related sessions
created during the protocol communications. Normally, a normal treats the triggered
sessions as independent sessions and blocks them. However, your Gateway can co-relate
the triggered sessions with the initial session and group them together in the NAT session
table. As a result, you need only specify which protocol type and port number you want to
track, as well as some other related parameters. In this way, the Gateway can pass the
special applications according to the supplied information.
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Configuring Your Gateway
Assume, for example, that to use H.323 in a Net Meeting application, a local client starts a
session A to a remote host. The remote host uses session A to communicate with the local
host, but it also could initiate another session B back to the local host. Since there is only
session A recorded in the NAT session table when the local host starts the communication,
session B is treated as an illegal access from the outside and is blocked. Using the Special
Application menu, you can configure the Gateway to co-relate sessions A and B and
automatically open the port for the incoming session B.
The maximum allowed triggers is 50. To enable/disable the special application function,
users can check/uncheck the Enable Triggering checkbox and press the APPLY icon to
make it effective without reboot.
To display the Special Applications menu, click
Firewall
in the menu bar and then click the
Special Application
submenu. Figure 29 shows an example of the menu.
Figure 29. Special Applications Menu
To enable port triggering:
1. In the Special Application menu, check
Enable Triggering
and click the
Apply
button. The
Trigger Table becomes available.
2. Click the
Add
button below the table. The Trigger menu appears (see Figure 30).
50
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