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Setting LAN IP Filtering

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.

Prerequisite

The IP address filtering function is enabled. For details, see Enabling or Disabling the Firewall.

Context

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.
NOTE:

For details about the ports used for specific services, contact the relevant service providers.

Procedure

  1. Choose > > .
  2. Click and set the parameters.
  3. Click to save the settings.

    NOTE:
    • : to edit an item.
    • : to delete an item.

  4. Click for the settings to take effect.

Blocking a Client from Accessing a Specified Website

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:

  1. Choose > > .
  2. Click and set the parameters.

    Enter 192.168.1.101.

    NOTE:

    You can view the IP addresses of clients connected to the on the page under .

    Enter 80.

    1. From the operating system, choose Start > Run.
    2. Enter cmd and press Enter.
    3. In the displayed command-line interface, enter ping www.abc.com and press Enter.
    4. View the IP address of www.abc.com. For example, it is 1.2.3.4.
    5. In the text box for on the relevant page of the , enter 1.2.3.4.
    NOTE:

    The Windows XP operating system is used in this example to describe how to obtain wide area network (WAN) IP addresses.

    Enter 80.

    Select .

    NOTE:

    If you do not know the protocol, select . The will automatically select an appropriate protocol.

    Select .

    Click .

  3. Click for the settings to take effect.
Parent topic: Security Settings