To modify a tunnel, select Modify > Elements > Tunnels from the Modify pull-down menu. To modify a single tunnel, select the tunnel from the table and click “Modify”. If multiple tunnels all require the same modification, then select those tunnels in the table (using the <SHIFT> and <CTRL> keys for multiple selection) and click “Modify”. If all tunnels in the network require the same modification, then click “Modify” and select “All Entries”.
In the window that is displayed, specify only those fields you wish to modify. If a field is left blank, no changes will be made to that field.