3com Webcache 1000 (3C16115) User Manual

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You can configure your network into subnets and assign specific client 
machine MAC addresses to be provided IP addresses within specific 
subnets by DHCP. You can then prevent specific subnet IP address 
ranges from accessing the Web through the Webcache through Web 
Client Blocking.

For example, you configure your user group A to use a subnet defined 
as 10.1.2.0-255, and group B to use another subnet defined as 
10.1.3.0-255. If you want to prevent group B from accessing the Web, 
you would add the subnet 10.1.3.0-255 to the Web Client Blocking 
configuration. Group B would then be unable to access the Web, 
while group A would have access.

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You can configure your DHCP server to return specific IP addresses 
based on the requesting client machine’s MAC address. You can 
configure Web Client Blocking to block either specific client machine 
IP addresses, or ranges of IP addresses, as appropriate.

To configure Web Client Blocking using the Web interface:

1 Log in to the Web interface.

2 Click Device View on the Toolbar.

3 Select System -> Caching -> Client Machine Blocking in the 

Navigation Tree.

4 Check Block Access From All Web Clients to enable Web Client Blocking.

5 In the Except these IP Addresses field, type the IP addresses or IP address 

ranges of the client machines that you want to allow access and click 
Add.

You can enter 

 to allow access for that IP 

address range, or enter 

 to allow access for that IP 

address. Separate individual ranges or addresses with a comma.

CAUTION: If the browser on the client machine that you are using to 
configure the Webcache is also using the Webcache as a proxy, and you 
enable Web Client Blocking, you must ensure that you add the client 
machine to the Except these IP Addresses field. If you do not do this, 
access from the client machine to the Webcache will be blocked,