Networks

To View or Modify Advanced Array Configuration Properties (Networks Category)

1. Under the Networks heading (see Figure 5-1), enter or accept the values for the following properties:

Control Network

The subnet number of the control network, expressed in dotted-decimal notation. The host portion of the address is expressed in one or more zeroes. We suggest the use of one subnet from 10.0.0.0 or 192.168.89.0, ideally one not used by anyone else in your organization. Keep in mind that the control network is a private network, distinct from the network over which a Netra Proxy Cache server interacts with clients. No packets are forwarded between control and service networks. Such traffic would be disruptive of array operation.

Netmask

The netmask of the control network. It is recommended you use 255.255.255.0.

Service Network

The subnet number of the service network, expressed in dotted-decimal notation. Express the host portion of the address in one or more zeroes. The service network is the network over which the Netra Proxy Cache server interacts with clients. This address is the subnet portion of the IP address you assigned to given Netra Proxy Cache server. An example of a valid Class B subnet address is 129.144.0.0; a Class C example is 195.144.168.0.

Netmask

The netmask of the service network. An example of a netmask for a network that subnets Class B addresses is 255.255.255.0.

Multicast Address

The multicast address used by array software to send heartbeat messages over the control network to all members of the array. The Internet Authority for Network Addresses (IANA) has assigned the multicast address 224.0.1.62 to the Netra Proxy Cache server product. It is recommended that you use this address. If the default address is already in use, you need to select another multicast address. It is suggested that you use snoop (1M) to ensure that an address you choose is not already in use.

If you have more than one Netra Proxy Cache array on the same subnet, use different multicast addresses for the different arrays. The array software uses the service network for a redundant multicast. Using different multicast addresses to distinguish arrays is less prone to conflict than is using the same multicast address with different port numbers. (See the Control Port property, below.)