TRENDnet TW100-S4W1CA User Manual page 19

2-4-2 Virtual Server
Configure the Broadband Router as a virtual server to allow the Router to
watch outgoing data for specific port numbers. The IP address of the
computer that sends the matching data is remembered by the Router, so
that when the requested data returns through the Router, the data is pulled
back to the proper computer by way of IP address and port mapping rules
such as the Web or FTP at the local site via public IP addresses can be
automatically redirected to local servers configured with private IP
addresses. In other words, depending on the requested service (TCP/UDP
port number), the Broadband Router redirects the external service request
to the appropriate server.
Example:
ID Server IP Mapping Port
1 192.168.2.20
2 192.168.2.12
3 192.168.2.12
4 192.168.2.28
Type Comment
80 TCP Web Server
20 TCP FTP Server
21 TCP FTP Server
23 TCP Telnet Server
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2-5 Firewall
The Broadband Router provides extensive firewall protection by
restricting connection parameters to limit the risk of hacker attacks and by
defending against a wide array of common hacker attacks.
The Broadband Router provides packet filtering rules by restricting
service ports, IP address or MAC address. However, for applications that
require unrestricted access to the Internet, you may configure a specific
client/server as a demilitarized zone (DMZ).
2-5-1 Block WAN Ping
When the "Block WAN Ping" activated, it is causes the public WAN IP
address on the Broadband Router to ignore ping commands. Pinging
public WAN IP addresses is a common method used by hackers to test
whether the WAN IP address is valid and supports a network.
2-5-2 Client Filtering
To block a certain client PC accessing the Internet:
You can filter Internet access for local clients based on IP addresses,
application types, (i.e., HTTP port), and time of day.
For example, this screen shows that clients in the address range
192.168.2.50-99 are permanently restricted from using FTP (Port 21),
while clients in the address range 192.168.2.110-119 are blocked from
browsing the Internet (port 80) from Monday to Friday and from 0:00AM
to 11:00 PM.
Example:
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