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Creating NAT Pools

Use the Create NAT Pools page to create NAT pools.

To create a NAT pool:

  1. Select Configuration > NAT > Pools.

    The NAT Pools page appears.

  2. Click the add icon (+).

    The Create NAT Pool page displays fields required for creating and configuring a NAT pool.

  3. Complete the configuration according to the guidelines provided in Table 1.
  4. Click OK to save the changes. A NAT pool with the configuration you provided is created.

    If you want to discard your changes, click Cancel instead.

Table 1 provides guidelines on using the fields on the Create NAT Pool page.

Table 1: Fields on the Create NAT Pool Page



General Information


Enter a unique string of alphanumeric characters, dashes, spaces, and underscores. Colons, and periods are not allowed, and the maximum length is 31 characters.


Enter a description for the new NAT pool; maximum length is 1024 characters.

Pool Type

Select a NAT pool type to configure:

  • Source

  • Destination

Pool Address

Select a NAT pool address or click Add new address to create a new NAT pool address.

Routing Instance


Select the site to which the NAT pool is applicable.

Routing Instance

Select the required routing instance from the list of available routing instances for the selected site.


Host Address Base

Enter the base address of the original source IP address range. The Host Address Base is used for IP address shifting.


Select the translation type for the incoming traffic:

  • No Translation—There is no translation required for the incoming traffic.

  • Port/Range—Set the global default single port range for source NAT pools with port translation.

  • Overload—Multiple source addresses are translated to pool addresses. If you set Overload as the translation type, the value of the Pool Address field cannot be an IP range or subnet, but it will be a single address.

Address Pooling

Select a NAT address pooling behavior:

  • Paired—Use this option for applications that require all sessions associated with one internal IP address to be translated to the same external IP address for multiple sessions.

  • Non-Paired—Use this option for applications that can be assigned IP addresses in a round-robin fashion.


Enter the port number for the destination NAT pool type.


Enter the start port range for the source NAT pools, if the translation type is Port/Range. The value of the port range can be any value between 1024 to 65535.


Enter the end port range. The value of the port range can be any value between 1024 to 65535.

Port Overloading Factor

Configure the port overloading capacity for a source NAT pool. If the factor is set to x, each translated IP address has x times the maximum number of ports available. The value of the port overloading factor can range between 2 and 32.

Address Sharing

Enable address sharing so that multiple internal IP addresses can be mapped to the same external IP address. Select this option only when the source NAT pool is configured with no port translation. When a source NAT pool has only one or a few external IP addresses available, the address sharing option with a many-to-one address mapping increases NAT resources and improves traffic.

Overflow Pool Type

Select a source pool to use when the current address pool is exhausted.

  • Interface—Allow the egress interface IP address to support overflow.

  • Pool—Name of the source address pool.

    • Overflow Pool—When addresses from the original source NAT pool are exhausted, IP addresses and port numbers are allocated from the overflow pool. A user-defined source NAT pool or an egress interface can be used as the overflow pool. (When the overflow pool is used, the pool ID is returned with the address.)