The function to filter IP addresses in the local area network (LAN) can be used to restrict the access to specific Internet services from specified clients in the LAN.
The following table lists common protocols at the Application Layer in the Transmission Control Protocol and the Internet Protocol (TCP/IP).
Protocol | Default Port | Service Provided |
---|---|---|
HTTP | 80 | Browse Web pages. |
SMTP | 25 | Send emails. |
POP3 | 110 | Receive emails. |
FTP | 21 | Transmit files. |
Telnet | 23 | Log in to remote computers. |
For details about the ports used for specific services, contact the relevant service providers.
To block the client whose IP address is 192.168.1.101 in the wireless local area network (WLAN) from accessing www.abc.com, do the following:
Enter 192.168.1.101. NOTE:
You can view the IP addresses of clients connected to the on the page under . |
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Enter 80. |
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NOTE:
The Windows XP operating system is used in this example to describe how to obtain wide area network (WAN) IP addresses. |
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Enter 80. |
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Select . NOTE:
If you do not know the protocol, select . The will automatically select an appropriate protocol. |
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Select . |
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Click . |