Asus WL-500g Deluxe - Manual (Page 56)

3. Utilities
56 ASUS Wireless Router
Chapter 3 - Software Configuration
Internet Firewall (Cont.)
WAN to LAN Filter Table
Source/Destination IP Address - For source or destination IP address,
you can input a specific IP address, such as "192.168.122.1", or IP addresses
within one subnet, such as "192.168.123.*", or "192.168.*.*", or all IP
addresses as "*".
Source/Destination Port or Port Range - For source or destination port
range, you can input a specific port, such as "95", or ports within a range,
such as "103:315", ">100", or "<65535".
Protocol – This field indicates the protocol type of packets this rule like to
filer.