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Addressing Information

You must configure a specific address, a prefix, or the address-range boundaries:

If you specify a specific address or prefix, it is assumed the translated address belongs to the inet.0 routing instance. The following addresses, while valid in inet.0, cannot be used for NAT translation:
- 0.0.0.0/32
- 127.0.0.0/8 (loopback)
- 128.0.0.0/16 (martian)
- 191.255.0.0/16 (martian)
- 192.0.0.0/24 (martian)
- 223.255.255.0/24 (martian)
- 224.0.0.0/4 (multicast)
- 240.0.0.0/4 (reserved)
- 255.255.255.255 (broadcast)
You can specify one or more IPv4 or IPv6 address prefixes in the pool statement and in the from clause of the NAT rule term. This enables you to configure source translation from a private subnet to a public subnet without defining a rule term for each address in the subnet. Destination translation cannot be configured by this method. For examples, see Examples: Configuring Network Address Translation Properties.
When you configure static source NAT, the address prefix size you configure at the [edit services nat pool pool-name] hierarchy level must be larger than the source-address prefix range configured at the [edit services nat rule rule-name term term-name from] hierarchy level. The source-address prefix range must also map to a single subnet or range of IPv4 or IPv6 addresses in the pool statement. Any pool addresses that are not used by the source-address prefix range are left unused; pools cannot be shared.

Note: When you include a NAT configuration that changes IP addresses, it might affect forwarding path features elsewhere in your router configuration, such as source class usage (SCU), destination class usage (DCU), filter-based forwarding, or other features that target specific IP addresses or prefixes.

NAT configuration might also affect routing protocols operation, because the protocol peering, neighbor, and interface addresses can be altered when routing protocols packets transit the Adaptive Services (AS) or MultiServices PIC.

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