NetVault 13.1.2 - Administration Guide

About Network Manager

The Network Manager (nvnmgr) and Communications Manager (nvcmgr) support the inter-process messaging system. Both run as processes on Linux and UNIX systems and as threads within the nvpmgr process on Windows.

These processes perform the following functions:

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The Network Manager and Communications Manager work in tandem to transmit inter-process messages to remote clients. While the Communications Manager handles communication between the NetVault processes on local machines, Network Manager transmits the inter-process messages to remote clients.

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The Network Manager broadcasts availability messages, which help determine the status of the NetVault Clients.

You can modify the Network Manager settings from the Change Settings page.


	NOTE: You must restart the NetVault Service to apply any changes to the Network Manager settings.

Configuring timeout settings for Network Manager

To configure timeout settings for Network Manager:

In the Navigation pane, click Change Settings.

On the NetVault Server Settings page, complete one of the following actions:

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To configure default settings for the NetVault Server, go to Step 3.

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To configure default settings for a NetVault Client, click Clients. In the NetVault Clients table, select the client, and click Next.

Under Services, click Network Manager.

In the Network Manager dialog box, under Timeouts, configure the following settings.

Table 133. Network Manager timeout settings
Setting	Description
Time to complete a remote connection	This setting controls how long the NetVault Server tries to establish a connection with a remote client. The default setting is 300 seconds. To change the timeout interval, type or select a new value. The timeout interval is specified in number of seconds.
Time to wait before dropping inactive connection(s)	This setting controls how long the NetVault Server waits before ending an inactive connection. It helps to reduce the amount of resources consumed by idle connections. The default setting is 600 seconds. To change the timeout interval, type or select a new value. The timeout interval is specified in number of seconds.
Keep Alive rate	Keep-alive messages are used to verify that a connection between two NetVault machines is still intact. The keep-alive rate controls how often the server sends keep-alive messages. The default setting is 7 seconds. To change the interval, type or select a new value. The keep‑alive rate is specified in number of seconds.
Time between availability broadcasts	The NetVault Clients broadcast availability messages at regular intervals that provide their status and location on the network. These broadcasts are used to discover new clients and update the client status on the NetVault WebUI. The default interval for availability broadcasts is 600 seconds. To change the interval, type or select a new value. The broadcast interval is specified in number of seconds. NOTE: Setting a very small interval can increase the network traffic, while setting a large interval can cause delays in discovering the client and updating client status on the NetVault WebUI.
Time between security broadcasts	Security broadcasts discover the password-protection status of clients, and notify whether its password has been enabled or disabled on a client. The Client Status icons on the NetVault WebUI are updated based on these broadcasts. The default interval for security broadcasts is 600 seconds. To change the interval, type or select a new value. The broadcast interval is specified in number of seconds.
Time between availability checks	The NetVault Server performs availability checks at regular intervals to scan for changes in the network settings. If a change is detected, the server sends an interim broadcast to propagate the new settings. The broadcast system is then reset to regular pulse, reducing network traffic. The default interval for availability checks is 10 seconds. To change the interval, type or select a new value. You can reduce the interval between two checks to quickly detect and transmit changes. If you do not want to apply the changes immediately, use the default value or set it equal to the interval for Availability Broadcasts.

Click Apply to apply the new settings and close the dialog box.

Enabling or disabling availability broadcasts

Availability broadcasts are used to discover NetVault Clients and update the client status on the NetVault WebUI. You can enable or disable availability broadcasts from the Change Settings page.


	NOTE: Although you can disable availability broadcasts, it is not recommended.

To enable or disable availability broadcasts:

In the Navigation pane, click Change Settings.

On the NetVault Server Settings page, complete one of the following actions:

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To configure default settings for the NetVault Server, continue to Step 3.

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To configure default settings for a NetVault Client, click Choose machine. In the Choose machine drawer, select the client, and click Go to settings.

Under Services, click Network Manager.

In the Network Manager dialog box, under Connections, configure the following setting:

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Broadcast details to machines on local network: This check box is selected by default. Although you can disable this option, it is not recommended.

Availability broadcasts are used to discover NetVault Clients and update the client status on the NetVault WebUI. Without these broadcasts, you can only add clients by using the client FQDN or IP address.

Click Apply to apply the new settings and close the dialog box.

Configuring network addresses for multihomed machines

For multihomed machines, you can specify the preferred network address, fallback addresses, and barred addresses from the Change Settings page.

When a connection is initiated, the addresses are attempted in the following order:

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Preferred network address

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Fallback addresses

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Any other addresses in the order defined by the binding order of the host machine

To configure the network addresses for multihomed machines:

In the Navigation pane, click Change Settings.

On the NetVault Server Settings page, complete one of the following actions:

•

To configure default settings for the NetVault Server, continue to Step 3.

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To configure default settings for a NetVault Client, click Choose machine. In the Choose machine drawer, select the client, and click Go to settings.

Under Services, click Network Manager.

In the Network Manager dialog box, under Connections, configure the following settings.

Table 134. Network settings for multihomed machines
Setting	Description
Preferred network address	Specify the primary IP address for network connection. You can only specify a single IP address.
Comma separated list of barred address(es)	Specify the barred or blocked addresses that you do not want to use for NetVault connections. To specify multiple addresses, use a comma as delimiter. NOTE: You must restart the NetVault Service to apply any changes to the barred addresses setting.
Comma separated list of fallback address(es)	Specify the fallback addresses to use when the preferred network address is not available. To specify multiple addresses, use a comma as delimiter.


	IMPORTANT: You should use these settings only if machine is connected to multiple networks, either through multiple Network Interface Cards or through virtual IP addressing. When configuring the network addresses, make sure that the preferred, barred, and fallback addresses do not conflict with each other

Click Apply to apply the new settings and close the dialog box.

Important notes

If the preferred address is unavailable and the NetVault Server starts using a fallback address, it does not automatically revert to the preferred address when the IP becomes available.

To force the NetVault Server to use the preferred address, do one of the following:

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Remove the client and add it again.

When you remove the client, the message “Machine <NetVault Machine Name> Has Gone Down” (Warning Level: Background) is displayed on the View Logs page. Wait until the timeout for remote connection expires. The timeout interval is determined by the Time to complete remote connection setting (set to 60 seconds by default).

When the client is up and detected on the network, the message “Machine <NetVault Machine Name> Has Come Up” (Warning Level: Background) is displayed on the View Logs page. To add the client, use the Find Machine command, and specify its preferred network address in the box.

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Alternatively, disable or disconnect the network interface currently in use until the timeout for remote connection expires. The value configured for the Time to complete remote connection setting determines the duration for which the network interface needs to be disabled or disconnected. Restart the NetVault Service when the client is reported as unavailable. The NetVault Server uses the preferred address when the next connection attempt is made after you restart the service on the client.

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NetVault 13.1.2 - Administration Guide

About Network Manager

Configuring timeout settings for Network Manager

Enabling or disabling availability broadcasts

Configuring network addresses for multihomed machines