NetVault 11.3 - Administration Guide

You can configure the firewall settings when deploying or adding a client, or update these settings from the Change Settings page. You can also use the NetVault Configurator (Windows only) or Txtconfig utilities to configure the firewall settings for new or existing clients.


	NOTE: NetVault Backup does not support firewalls using NAT (Network Address Translation)/IP Masquerading.

The following table provides a brief description of the firewall settings.

Table 4. Firewall settings
Option	Description
Listen ports for devices	Ports to listen on for device requests. Configure this option on the NetVault Backup machines that have a locally attached device (for example, NetVault Backup Server or NetVault Backup Clients with SmartClient licenses). Requirement: Two ports per drive.
Connect ports for devices	Ports that plug-ins use to connect to remote storage devices. Configure this option on clients that connect to remote devices. Requirement: Two ports per drive.
Listen ports for NetVault Backup message channels	Ports for receiving messages during data transfers. Configure this option on both the NetVault Backup Server and the Client. NetVault Backup requires a two-way connection between the Server and the Client for message channels. Requirement: Three ports per client. To run two or more plug-ins simultaneously on a client, configure two ports per plug-in and an extra port per client. For example, to run two plug-ins simultaneously, configure (2 * 2) + 1 = 5 ports for a client.
Connect ports for NetVault Backup message channels	Ports for sending messages during data transfers. Configure this option on both the NetVault Backup Server and the Client. NetVault Backup requires a two-way connection between the Server and the Client for message channels. Requirement: Three ports per client. To run two or more plug-ins simultaneously on a client, configure two ports per plug-in and an extra port per client. For example, to run two plug-ins simultaneously, configure (2 * 2) + 1 = 5 ports for a client.
Connect ports for NDMP control channels	Ports for sending NDMP messages (NDMP control channels). Configure this option on the NetVault Backup Server (on which the plug-in is installed) when a firewall separates an NDMP filer and the NetVault Backup Server. By default, NetVault Backup uses port number 10000. You can change it, if necessary.
Listen ports for NDMP data channels	Ports to listen on for NetVault Backup devices operating as NDMP movers. Configure this option on the NetVault Backup Server or Client to which the device is attached. These ports are used for data transfers between the NDMP filer and storage device when a firewall separates the two networks.
Connect ports for inter-machine setup	Ports for establishing initial contact (broadcast channels) while adding a NetVault Backup Client, and later to ascertain its availability. Requirement: Two ports per client.

You can use the following formats to specify the ports or port ranges for data channels, message channels, and broadcast channels:

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A comma-separated list (example: 20000, 20050)

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A port-range separated by a dash (example: 20000-20100)

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A combination of comma-separated list and port-range (example: 20000-20100, 20200)

To simplify administration, we recommend that you configure the same port-range for data, message, and broadcast channels across all NetVault Backup machines.

IMPORTANT:

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NetVault Backup does not support firewalls using NAT (Network Address Translation)/IP Masquerading.

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NetVault Backup uses port number 20031 for TCP and UDP messaging. Make sure that this port is open on the firewall.

For more information, see the following sections:

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Firewall filtering rules

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Firewall configuration example

Firewall filtering rules

When creating firewall rules on the server and client machines, make sure that you open the following ports to send and receive traffic from NetVault Backup.

Table 5. Firewall filtering rules
From	To	TCP/UDP	Source port	Destination port
Server	Client	TCP	Connect ports for inter-machine connection setup specified on the NetVault Backup Server	20031
Client	Server	TCP	Connect ports for inter-machine connection setup specified on the NetVault Backup Clients	20031
Server	Client	TCP	Connect ports for message channels specified on NetVault Backup Server	Listen Ports for Message Channels specified on the NetVault Backup Clients
Client	Server	TCP	Listen ports for message channels specified on the NetVault Backup Clients	Connect Ports for Message Channels specified on the NetVault Backup Server
Server	Client	UDP	20031	20031
Client	Server	UDP	20031	20031
Server	Client	TCP	Listen ports for devices specified on the NetVault Backup Server and Clients	Connect ports for devices specified on the NetVault Backup Clients
Client	Server	TCP	Connect ports for devices specified on NetVault Backup Clients	Listen ports for devices specified on NetVault Backup Server and Clients

Firewall configuration example

This example illustrates the network port requirements for a NetVault Backup system with the following configuration:

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Number of drives: 6

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Number of clients with one plug-in: 10

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Number of clients with two plug-ins: 2

Table 6. Example: Port requirement calculation
NetVault Backup machine	Port type	Requirement	Total ports	Example port range
Server (with locally attached storage device)	Connect ports for inter‑machine connection setup	Minimum two ports per client	24	50300-50323
	Connect ports for NetVault Backup message channels	Minimum three ports per client	38	50200-50237
	Listen ports for devices	Minimum two ports per drive	12	50100-50111
Client	Connect ports for inter‑machine connection setup	Minimum two ports per client (These ports can be the same as the ports specified on the server side.)	24	50300-50323
	Listen ports for NetVault Backup message channels	Minimum three ports per client	38	50500-50537
	Connect ports for devices	Minimum two ports per drive	12	50400-50411

The following table illustrates the firewall filtering rules for this system.

Table 7. Example: Firewall filtering rules
From	To	TCP/UDP	Source port	Destination port
Server	Client	TCP	50300-50323	20031
Client	Server	TCP	50300-50323	20031
Server	Client	TCP	50200-50237	50500-50537
Client	Server	TCP	50500-50537	50200-50237
Server	Client	UDP	20031	20031
Client	Server	UDP	20031	20031
Server	Client	TCP	50100-50111	50400-50411
Client	Server	TCP	50400-50411	50100-50111