Creating NAT Pools
A NAT pool is a set of IP addresses that you can define and use for translation. NAT policies perform address translation by translating internal IP addresses to the addresses in these pools. Unlike static NAT, where there is a one-to-one mapping that includes destination IP address translation in one direction and source IP address translation in the reverse direction, with source NAT, you translate the original source IP address to an IP address in the address pool. With destination NAT, you translate the original destination address to an IP address in the address pool.
Do not overlap NAT addresses for source NAT, destination NAT, and static NAT within one routing instance.
Before You Begin
Read the NAT Overview topic
Review the NAT pools main page for an understanding of your current data set. See NAT Pools Main Page Fields for field descriptions.
To configure a NAT pool:
- Select Configure > NAT Policy > Pools.
- Click the plus sign (+) to create a new NAT pool.
- Complete the configuration according to the guidelines provided in Table 1.
- Click OK.
A new NAT pool with your configurations is created. You can also assign NAT pools to a domain; see Assigning Policies and Profiles to Domains.
Table 1: NAT Pool Settings
Enter a unique string of alphanumeric characters, colons, periods, slashes, dashes, and underscores; no spaces allowed; 31-character maximum.
Enter a description for the new NAT pool; maximum length is 255 characters.
Select a NAT pool type to configure:
Select a NAT pool address or click Create to create a new NAT pool address.
Select a device for a routing instance.
Select the required routing instance from the list of available routing instances for the selected device.
Enter the port number for the destination Nat pool type.
Host Address Base
Specify the base address of the original source IP address range. This is used for IP address shifting.
Specify the following translation type for the incoming traffic:
Specify a NAT address pooling behavior:
Specify that multiple internal IP addresses can be mapped to the same external IP address. Use this option only when the source NAT pool is configured with no port translation. When a source NAT pool has only one or 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
Specify a source pool to use when the current address pool is exhausted.
Specify the beginning port range for the source NAT pools, if the Translation type is Port/Range. The starting and ending port range is 1024 through 65535.
Specify the end port range. The starting and ending port range is 1024 through 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 range is 2 through 32.