If a client does not have internet access and needs to connect to the Commvault infrastructure via a local backup gateway, then you can enable a network gateway role for an existing backup gateway server that has internet access.
Procedure
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From the Command Center navigation pane, go to Manage > Infrastructure > Servers.
The Servers page appears.
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Click a gateway server.
The server page appears.
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On the Configuration tab, in the Network settings tile, click the edit button
.The Edit network settings dialog box appears.
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Select the Enable network gateway box, and then click Save.
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During installation of the end client, enter this backup gateway hostname and tunnel port (in the format hostname:tunnelport).