Netgear WC7600 参照マニュアル

There might be network configurations in which you cannot use multicast. If you disable 
multicast on the AP Upgrade Setting screen, the firmware upgrade process uses unicast, 
which is a slower process because the firmware upgrade is applied to groups of access 
points instead of simultaneously to all access points. The time that the unicast firmware 
upgrade process takes depends on the network load and on the type of Ethernet interface to 
which the wireless controller is connected.

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Open a web browser. In the browser’s address field, type the http:// followed by the IP 
address that you assigned to the wireless controller. 

By default, the IP address is 192.168.0.250. If you have not yet assigned another IP 
address to the wireless controller, type http://192.168.0.250.

The wireless controller’s login screen displays.

Enter your user name and password.

If you have not yet personalized your user name and password, enter admin for the user 
name and password for the password, both in lowercase letters.

Click the Login button.

The wireless controller’s web management interface opens and displays the Summary 
screen.

Select Maintenance > Upgrade > AP Upgrade Settings.

The AP Upgrade Settings screen displays.

Clear the Enable Multicast check box.

This check box is selected by default.

Click the Apply button.