Packet Filter Configuration
Configure router via WAN interface
Filter NetBIOS packets? No Yes
Policy
   

Packet Filter Configuration allows you to enable Router to filter out some specific packets in 2-ways of outgoing and incoming data flow. Thus, Router will act as a firewall!

Configure Router via WAN port
Enable this function will allow users to be able to configure Router via WAN connection through Internet, otherwise choose "Disable".

Filter NetBIOS packets?
This function allows user to filter the packets issued by WINS server which might triggle broadband router to dial out, which administrator doesn't like to, when broadband is at ldle status.

Policy
The Policy simply defines Router how to filter out the packets when they passed through Router. The default setting is "Disable". That means all the incoming/outgoing packets are free to pass by Router and no packets will be filtered out. The "Allow All" option means the same thing as "Disable" does, but with exception which defined by the accompanied "Exception Table". The "Deny All" option means all the the incoming/outgoing packets are rejected to pass Router, but also with exception which defined by the accompanied "Exception Table".

Exception Table
Enables you define what particular packets are excepted to the policy. You need to define the protocol, IP address and port number(0 represents any port) for the exception table. Some well known applications use predefined port number you can just check it out. This Expection Table allows you to add rules up to 200 entries to be filtered out.

Example:
The following example settings will filter the packet from this source IP range 192.168.16.60 ~ 192.168.16.70 ( port 0 means any port) to access the 192.168.16.1 with port number 8080, 80(WWW) and 23(Telnet).

Well known port symbols: F FTP:21 W WWW:80 G GOPHER:70 T TELNET:23
S SMTP:25 P POP:110 D DNS:53 N NBIOS:137,138,139
Packet Filter - Exception Table

Protocol IP-Lower
(Source)
IP-Upper
(Source)
Port
(Source)
IP-Lower
(Destination)
IP-Upper
(Destination)
Port
(Destination)
F W G T S P D N
1 TCP 192.168.16.60 192.168.16.70 0 192.168.16.1 192.168.16.1 8080 * *









Protocol IP-Lower(Source) IP-Upper(Source) Port(Source) IP-Lower(Destination) IP-Upper(Destination) Port(Destination) F W G T S P D N
2 . . . . . . . . . . . .