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Field/Header
Description
External Port End
Enter the ending external port number (when you select
Custom Server).
When a service is selected, the port ranges
are automatically configured.
Protocol
TCP, TCP/UDP, or UDP.
Internal Port Start
Enter the internal port starting number (when you select
Custom Server).
When a service is selected the port ranges
are automatically configured
Internal Port End
Enter the internal port ending number (when you select
Custom Server).
When a service is selected, the port ranges
are automatically configured.
5.4.2
Port Triggering
Some applications require that specific ports in the firewall be opened for access by
the remote parties.
Port Triggers dynamically 'Open Ports' in the firewall when an
application on the LAN initiates a TCP/UDP connection to a remote party using the
'Triggering Ports'.
The Router allows the remote party from the WAN side to
establish new connections back to the application on the LAN side using the 'Open
Ports'.
A maximum 32 entries can be configured.
To add a Trigger Port, click
Add
. The following will be displayed.
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Consult the table below for field and header descriptions.
Field/Header
Description
Use Interface
Select the WAN interface from the drop-down box.
Select an Application
Or
Custom Application
User should select the application from the list.
Or
User can enter the name of their choice.
Trigger Port Start
Enter the starting trigger port number (when you select
custom application).
When an application is selected, the
port ranges are automatically configured.
Trigger Port End
Enter the ending trigger port number (when you select
custom application).
When an application is selected, the
port ranges are automatically configured.
Trigger Protocol
TCP, TCP/UDP, or UDP.
Open Port Start
Enter the starting open port number (when you select
custom application).
When an application is selected, the
port ranges are automatically configured.
Open Port End
Enter the ending open port number (when you select
custom application).
When an application is selected, the
port ranges are automatically configured.
Open Protocol
TCP, TCP/UDP, or UDP.
5.4.3
DMZ Host
The DSL router will forward IP packets from the WAN that do not belong to any of
the applications configured in the Virtual Servers table to the DMZ host computer.
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To
Activate
the DMZ host, enter the DMZ host IP address and click
Save/Apply
.
To
Deactivate
the DMZ host, clear the IP address field and click
Save/Apply
.
5.5
Security
To display this function, you must enable the firewall feature in WAN Setup.
For detailed descriptions, with examples, please consult
Appendix A – Firewall
.
5.5.1
IP Filtering
This screen sets filter rules that limit IP traffic (Outgoing/Incoming).
Multiple filter
rules can be set and each applies at least one limiting condition.
For individual IP
packets to pass the filter all conditions must be fulfilled.
NOTE:
This function is not available when in bridge mode. Instead,
MAC Filtering
(pg. 30) performs a similar function.
OUTGOING IP FILTER
By default, all outgoing IP traffic is allowed, but IP traffic can be blocked with filters.
To add a filter (to block some outgoing IP traffic), click the
Add
button.
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On the following screen, enter your filter criteria and then click
Apply/Save
.
Consult the table below for field descriptions.
Field
Description
Filter Name
The filter rule label
Protocol
TCP, TCP/UDP, UDP, or ICMP.
Source IP address
Enter source IP address.
Source Subnet Mask
Enter source subnet mask.
Source Port (port or port:port)
Enter source port number or range.
Destination IP address
Enter destination IP address.
Destination Subnet Mask
Enter destination subnet mask.
Destination Port (port or port:port)
Enter destination port number or range.
INCOMING IP FILTER
By default, all incoming IP traffic is blocked, but IP traffic can be allowed with filters.
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To add a filter (to allow incoming IP traffic), click the
Add
button.
On the following screen, enter your filter criteria and then click
Apply/Save
.
Consult the table below for field descriptions.
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