TM Communications › Controlling the Phone Home Policy

Controlling the Phone Home Policy

In addition to the traditional subnet Discovery Election Methods, you can also create and use a Phone Home policy on CA TM clients. Per a defined schedule specified in the Phone Home policy, the CA TM client sends a notification and policy consistency check to the CA TM Server.

Note: If the local IP range of the client does not exist within the CA TM Server, Phone Home creates a new subnet in the Subnets area on the Discovery tab of the CA TM Console. If too many subnets are created, this can become a management issue.

You can control the Phone Home's automatic subnet creation process using the following registry keys:

• AllowedSubnets
• UnallowedSubnets.

These keys are located in the CA TM registry branch under CurrentVersion\NameServer. The format of the IP ranges can be as follows and delimited with a comma:

• 192.x.x.x or 192.168.0.0/8 Class A Range
• 192.168.x.x or 192.168.0.0/16 Class B Range
• 192.168.1.x or 192.168.0.0/24 Class C Range

Note: By default the CA TM Console will not automatically generate subnets for the following addresses:

• Any subnet with the mask 255.255.255.255. This usually filters out point-to-point connections, since they typically have this mask.
• Any address of the form 127.0.0.x, since these are loopback addresses.
• Any address of the form 169.254.x.x, since these addresses are non-routable.
• Any address with the highest byte between 224 and 239, since these are multi-cast addresses.