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Web Gateway 7.1.5 Product Guide - McAfee

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Table 3-1 WCCP Services list (continued)<br />

Option Definition<br />

Input for load<br />

distribution<br />

Proxies and caching<br />

Network modes 3<br />

This main item does not appear in the list, but is visible in the Add and Edit windows.<br />

The following four elements are related to it, specifying what is used in a data packet<br />

as the criteria for load distribution.<br />

When running multiple appliances, load distribution can be configured for the proxies<br />

on them. Data packets can be distributed to these proxies based on the masking of<br />

source or destination IP addresses and port numbers or on a hash algorithm.<br />

• Source IP — When selected, load distribution relies on the masking of source IP<br />

addresses<br />

• Destination IP — When selected, load distribution relies on the masking of<br />

destination IP addresses<br />

• Source port — When selected, load distribution relies on the masking of source<br />

port numbers<br />

• Destination port — When selected, load distribution relies on the masking of the<br />

destination port numbers<br />

Assignment method This main item does not appear in the list, but is visible in the Add and Edit windows.<br />

The following elements are related to it, specifying the method used for load<br />

distribution.<br />

• Assignment by mask — When selected, masking of the parameter specified above<br />

is used for load distribution<br />

• Assignment by hash — When selected, a hash algorithm is used for load<br />

distribution<br />

Assignment weight Value determining how much load is assigned to a proxy<br />

Use this value to assign more load to a proxy on an appliance that has more CPU<br />

capacity. 0 means no load is distributed to a proxy.<br />

Forwarding method This main item does not appear in the list, but is visible in the Add and Edit windows.<br />

The following two elements are related to it, specifying the forwarding method.<br />

• GRE-encapsulated — When selected, data packets are encapsulated by the router<br />

before being redirected<br />

• L2-rewrite to local NIC — When selected, data packets are redirected to the<br />

appliance by replacing the MAC address of the next device (on the route to the<br />

web server) with that of the appliance<br />

This is done on layer two (L2) of the standard communication model.<br />

L2-redirect target Network interface on an appliance that data packets are redirected to<br />

Magic (Mask<br />

Setting to assign a mask for use in redirecting web traffic<br />

assignment)<br />

Comment Plain-text comment on the WCCP service<br />

• L2 transparent — When selected, client requests sent to a web server under the IPv4 and IPv6<br />

protocols are intercepted by an additional network device and directed to the appliance using the<br />

Layer 2 redirection method<br />

Under this method, client requests are accepted on the appliance even if their destination IP<br />

addresses are not addresses of the appliance. The redirection is transparent to the clients.<br />

You need to enter the original ports for those client requests that are to be intercepted and<br />

redirected in a list on the appliance together with the ports that these requests are redirected to.<br />

The additional network device must be configured accordingly.<br />

Note: When this option is selected, requests can not be transmitted using a connection in active FTP<br />

mode. Only the passive FTP mode is then available.<br />

<strong>McAfee</strong> <strong>Web</strong> <strong>Gateway</strong> <strong>7.1.5</strong> <strong>Product</strong> <strong>Guide</strong> 41

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