Understanding Static NAT

Static NAT defines a one-to-one mapping from one IP subnet to another IP subnet. The mapping includes destination IP address translation in one direction and source IP address translation in the reverse direction. From the NAT device, the original destination address is the virtual host IP address while the mapped-to address is the real host IP address.

Static NAT allows connections to be originated from either side of the network, but translation is limited to one-to-one or between blocks of addresses of the same size. For each private address, a public address must be allocated. No address pools are necessary.

Note: The original destination address, along with other addresses in source and destination NAT pools, must not overlap within the same routing instance.

Static NAT does not perform port address translation (PAT) and no address pools are needed for static NAT.

In NAT rule lookup, static NAT rules take precedence over destination NAT rules and reverse mapping of static NAT rules take precedence over source NAT rules.

Related Topics

• JUNOS Software Feature Support Reference for SRX Series and J Series Devices
• Static NAT Configuration Overview
• Example: Configuring Static NAT (CLI)
• NAT Overview
• Understanding Static NAT Rules