# Add Engine load-balancing filter entries

You can manually add IP addresses to the Engine Cluster's load-balancing filter.

##

CAUTION:
Do not manually tune the load-balancing filter unless you are certain it is necessary. Normally, there is no need to tune the load-balancing filter, because the configuration generates all required entries automatically. Unnecessary tuning can adversely affect the operation of the filter.

For more details about the product and how to configure features, click Help or press F1.

## Steps

1. Select Engine
2. Right-click a Engine Cluster element and select Edit Engine Cluster.
3. In the navigation pane on the left, browse to General > Clustering.
4. In the Clustering Mode section, click Clustering.
5. Click the Manual LB Filters tab.
6. Click Add to generate a new filter entry row.
7. Double-click the IP Address field.
8. Select whether you want to filter an IPv4 Network, an IPv6 Network, or a Range of IP addresses.
9. Enter the IPv4 address and netmask, the IPv6 address and prefix, or the address range, and click OK.
10. Click the Action cell and select an action.
11. If you selected Replace by as the action, click the Replacement IP field and enter the replacement IP address.
12. (Optional) Select any additional options.
13. Click OK.
14. Click Save and Refresh to transfer the changes.

## Advanced Cluster Settings dialog box (Engines and Master Engines)

Use this dialog box to define advanced clustering settings.

Setting | Description
--- | ---
Cluster tab
Heartbeat Message Period | Specifies how often clustered Security Engines send heartbeat messages to each other (notifying that they are up and running). Enter the value in milliseconds. The default value is 1000 milliseconds (one second). CAUTION: Setting this option too low can result in unnecessary heartbeat failures. Setting this option too high can cause unnecessary service outages when a failure occurs.
Heartbeat Failover Time | Defines the time from the previous heartbeat message after which a node is treated as failed. Enter the value in milliseconds. The failover time must be at least twice as long as the Heartbeat Message Period. The default value is 5000 milliseconds. CAUTION: Setting this option too low can result in unnecessary heartbeat failures. Setting this option too high can cause unnecessary service outages when a failure occurs.
Node Synchronization table | Click or double-click the cells to edit the values.
Interface ID | Shows the assigned interface ID.
State Sync | Defines how the nodes exchange information about the traffic that they process. All (recommended) — Both full and incremental synchronization messages are sent. This option allows frequent updates without consuming resources excessively. Regular full synchronization guarantees that all nodes stay synchronized even if some incremental messages are not delivered. Full Only (not recommended) — Only full synchronization messages are sent. Incremental updates are not sent in between, so nodes might not have the same information about connections unless the full sync interval is reduced. Note: We strongly recommend using Access rule options to disable state synchronization for specific traffic rather than adjusting the State Sync settings for the cluster.
Full Sync Interval or Incr Sync Interval | Define how frequently the full synchronizations and incremental synchronizations are done. Do not set the values much higher or lower than their defaults (5000 ms for full, 50 ms for incremental) CAUTION: Adjusting the Sync Intervals has significant impact on the cluster's performance. Inappropriate settings seriously degrade the engine's performance.
Sync Security Level | None — No security features. Do not select this option unless the heartbeat traffic uses a dedicated, secure network that does not handle other traffic. Sign — (default) Transmissions are authenticated to prevent outside injections of connection state information. Encrypt and Sign — Transmissions are authenticated and encrypted. This option increases the overhead compared to the default option. However, it is recommended if node-to-node communications are relayed through insecure networks (for example, if the backup heartbeat is configured on an interface that handles other traffic). CAUTION: If the Engine Cluster's primary and secondary Heartbeat Interfaces are not connected to dedicated networks and you use None or Sign as the Sync Security Level, VPN traffic is transferred unencrypted between engine nodes when VPN traffic balancing requires that traffic is forwarded between the nodes.
Heartbeat IP | Enter an IP address between 224.0.0.0 and 239.255.255.255 if you want to change the multicast IP addresses used for node-to-node communications. The default is 224.0.0.221. This multicast IP address must not be used for other purposes on any of the network interfaces.
Synchronization IP | Enter an IP address between 224.0.0.0 and 239.255.255.255 if you want to change the multicast IP addresses used for node-to-node communications. The default is 224.0.0.221. This multicast IP address must not be used for other purposes on any of the network interfaces.

Setting | Description
--- | ---
Manual LB Filters tab This tab contains advanced settings for fine-tuning load-balancing filters. CAUTION: Do not manually tune the load-balancing filter unless you are certain it is necessary. Normally, there is no need to tune the filter, because the configuration generates all required entries automatically. Unnecessary tuning can adversely affect the operation of the filter.
Filter Mode | Defines how traffic is balanced between the nodes. Static — Packet ownership (the node to which the connection or packet belongs) can change only when nodes are added or removed from the cluster, or when they switch from one state to another. Dynamic — Traffic is balanced to avoid node overloads and existing connections are moved between nodes whenever overload is detected.
Load-Balancing Filter Uses Ports (Engines only) | When selected, includes a port value for selecting between all nodes. This setting decreases the granularity of VPN load balancing, and increases the granularity of other traffic load balancing. In typical networks, traffic is balanced based on IP address information only. If there is a dominating pair of communication IP addresses, apply the Use Ports option in the load-balancing filter entry only to their traffic and not globally. Note: Enabling this option is not compatible with some features, such as mobile VPNs.
Filter Entries table | Click Add Row to add a row to the table, or Remove Row to remove the selected row.
IP Address | Double-click the cell to open the Load Balancing Filter IP Entry dialog box.
Action | Select one of the following actions: None — No action is performed for the IP address specified in this entry. Used with the Replacement IP, Use Ports, NAT Enforce, Use IPsec, or Ignore Other options. Replace by — The IP address in the Replacement IP cell replaces the original IP address. This option is the default action. Pass on All Nodes — The filter entry allows packets to all nodes. Block on All Nodes — The filter entry blocks packets to all nodes. Pass on Node <number> — The filter entry forces the selected node to handle all packets belonging to the connection specified in this entry.
Replacement IP | Enter the replacement IP address.
Use Ports | Overrides the global Load-Balancing Filter Uses Ports option. For example, if two hosts send most traffic through the engine, you can set the Use Ports option for one of them to divide the traffic between the cluster nodes, improving granularity. Using this option for IP addresses in a VPN site can reduce the granularity of VPN load balancing and prevent VPN client connections involving those IP addresses.
NAT Enforce | Enables a specific NAT-related process in the load-balancing filter. CAUTION: Do not enable this option unless instructed to do so by Forcepoint Customer Hub.
Use IPsec | Specifies addresses receiving IPsec traffic on the node itself. The option enables a specific load-balancing process for all IPsec traffic directed to the IP address specified in the filter entry. CAUTION: Do not enable this option unless instructed to do so by Forcepoint Customer Hub.
Ignore Other | Forces the handling of packets to and from the specified IP addresses one node at a time.

## Load Balancing Filter IP Entry dialog box

Use this dialog box to define an IP address or range of addresses for a manual load-balancing filter.

Option | Definition
--- | ---
IPv4 Network | Enter the IP address in the IPv4 Address field and the netmask in the Netmask field.
IPv6 Network | Enter the IP address in the IPv6 Address field and the prefix in the Prefix field.
Range | Enter the IP addresses in the first and second fields.