# Define contact addresses for Node Dedicated IP Addresses

If NAT is applied to communications between the engine and some other component that contacts the engine, define the Default contact address for the Node Dedicated IP Address (NDI). You can also define location-specific contact addresses.

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## Steps

1. Select Engine.
2. Right-click an engine element and select Edit <element type>.
3. In the General pane, select the Location for this element.
4. Browse to Interfaces in the navigation pane on the left.
5. In the tree view, expand the tree and double-click the Node Dedicated IP Address (NDI) or the IP address for which you want to define a contact address.
   On Engine Clusters, the CVI contact address is used for VPNs and NDI contact addresses are used for other system communications.
6. In the IP Address Properties dialog box, double-click the Contact Address cell and define the contact address for each node in the Node Dedicated IP Address section.
7. Enter the Default contact address.
   The Default contact address is used by default whenever a component that belongs to another Location connects to this interface.
8. If components from some Locations cannot use the Default contact address, click Add to define Location-specific contact addresses.
9. Click the Contact Address column and enter the IP address that the components assigned to this Location must use when they contact the node.
   Note: Elements that belong to the same Location element always use the primary IP address (defined in the element’s properties) when contacting each other. Elements that do not belong to a specific Location belong to the Default Location.
10. Click OK to close the Exceptions dialog box.
11. Once you have defined the contact addresses for each node, click OK to close the IP Address Properties dialog box.

## Exceptions dialog box

Use this dialog box to define to define Location-specific contact addresses.

Option | Definition
--- | ---
Add | Adds the element to the Contact Addresses list.
Remove | Removes the element from the Contact Addresses list.