NAT Rule Models

Overview

The NAT Rule models provide a structured way to represent and validate NAT rule configuration data for Palo Alto Networks' Strata Cloud Manager. These models support configuration of source and destination address translation with various options including static IP mappings, dynamic IP and port allocation, and DNS rewrite functionality. The models handle validation of inputs and outputs when interacting with the SCM API.

Models

The module provides the following Pydantic models:

• NatRuleBaseModel: Base model with fields common to all NAT rule operations
• NatRuleCreateModel: Model for creating new NAT rules
• NatRuleUpdateModel: Model for updating existing NAT rules
• NatRuleResponseModel: Response model for NAT rule operations
• NatRuleMoveModel: Model for moving/reordering NAT rules
• SourceTranslation: Source translation configuration model
• DynamicIpAndPort: Dynamic IP and port translation model
• DynamicIp: Dynamic IP translation model
• StaticIp: Static IP translation model
• InterfaceAddress: Interface address configuration model
• DestinationTranslation: Destination translation configuration model
• DnsRewrite: DNS rewrite configuration model
• NatType: Enum for NAT types
• NatMoveDestination: Enum for move destination options
• NatRulebase: Enum for rulebase options
• DistributionMethod: Enum for distribution methods
• DnsRewriteDirection: Enum for DNS rewrite directions
• BiDirectional: Enum for bi-directional options

All models use extra="forbid" configuration, which rejects any fields not explicitly defined in the model.

Model Attributes

Attribute	Type	Required	Default	Description
name	str	Yes	None	The name of the NAT rule. Pattern: ^[a-zA-Z0-9_ \.-]+$
id	UUID	Yes*	None	UUID of the NAT rule (*response/update only)
description	str	No	None	Description of the NAT rule
tag	List[str]	No	[]	Tags associated with the NAT rule
disabled	bool	No	False	Whether the NAT rule is disabled
nat_type	NatType	No	ipv4	Type of NAT operation (ipv4, nat64, nptv6)
from_ (alias: from)	List[str]	No	["any"]	Source zones for the NAT rule
to_ (alias: to)	List[str]	No	["any"]	Destination zones for the NAT rule
to_interface	str	No	None	Destination interface of the original packet
source	List[str]	No	["any"]	Source addresses for the NAT rule
destination	List[str]	No	["any"]	Destination addresses for the NAT rule
service	str	No	"any"	The TCP/UDP service associated with the NAT rule
source_translation	SourceTranslation	No	None	Configuration for source translation
destination_translation	DestinationTranslation	No	None	Configuration for destination translation
active_active_device_binding	str	No	None	Active/Active device binding
folder	str	No**	None	Folder where NAT rule is defined. Max 64 chars
snippet	str	No**	None	Snippet where NAT rule is defined. Max 64 chars
device	str	No**	None	Device where NAT rule is defined. Max 64 chars

* Only required for response and update models ** Exactly one container type (folder/snippet/device) must be provided for create operations

Enum Types

NatType

Defines the NAT types supported by the system:

Value	Description
ipv4	IPv4 NAT (default)
nat64	NAT64 translation
nptv6	NPTv6 translation

NatMoveDestination

Defines valid destination values for rule movement:

Value	Description
top	Move to the top of the rulebase
bottom	Move to the bottom of the rulebase
before	Move before a specified rule
after	Move after a specified rule

NatRulebase

Defines valid rulebase values:

Value	Description
pre	Pre-rulebase (default)
post	Post-rulebase

DistributionMethod

Defines distribution methods for dynamic destination translation:

Value	Description
round-robin	Round-robin distribution
source-ip-hash	Source IP hash distribution
ip-modulo	IP modulo distribution
ip-hash	IP hash distribution
least-sessions	Least sessions distribution

DnsRewriteDirection

Defines DNS rewrite direction options:

Value	Description
reverse	Reverse DNS rewrite
forward	Forward DNS rewrite

BiDirectional

Defines bi-directional translation options:

Value	Description
yes	Enable bi-directional translation
no	Disable bi-directional translation

Source Translation Models

SourceTranslation Model

Main container for source translation configurations. Exactly one translation type must be provided:

Attribute	Type	Required	Default	Description
dynamic_ip_and_port	DynamicIpAndPort	No*	None	Dynamic IP and port translation configuration
dynamic_ip	DynamicIp	No*	None	Dynamic IP translation configuration
static_ip	StaticIp	No*	None	Static IP translation configuration

* Exactly one of these translation types must be provided

DynamicIpAndPort Model

Dynamic IP and port (PAT) translation configuration:

Attribute	Type	Required	Default	Description
type	Literal	No	"dynamic_ip_and_port"	Type identifier
translated_address	List[str]	No*	None	Translated source IP addresses
interface_address	InterfaceAddress	No*	None	Interface configuration for translation

* Exactly one of translated_address or interface_address must be provided

InterfaceAddress Model

Interface address configuration for translation:

Attribute	Type	Required	Default	Description
interface	str	Yes	None	Interface name
ip	str	No	None	IP address
floating_ip	str	No	None	Floating IP address

DynamicIp Model

Dynamic IP translation configuration:

Attribute	Type	Required	Default	Description
translated_address	List[str]	Yes	None	Translated IP addresses
fallback_type	str	No	None	Type of fallback (translated_address or interface_address)
fallback_address	List[str]	No	None	Fallback IP addresses (when fallback_type is translated_address)
fallback_interface	str	No	None	Fallback interface name (when fallback_type is interface_address)
fallback_ip	str	No	None	Fallback IP address (when fallback_type is interface_address)

StaticIp Model

Static IP translation configuration:

Attribute	Type	Required	Default	Description
translated_address	str	Yes	None	Translated IP address
bi_directional	BiDirectional	No	None	Enable bi-directional translation (yes/no)

Destination Translation Models

DestinationTranslation Model

Destination translation configuration:

Attribute	Type	Required	Default	Description
translated_address	str	No	None	Translated destination IP address
translated_port	int	No	None	Translated destination port (1-65535)
dns_rewrite	DnsRewrite	No	None	DNS rewrite configuration

DnsRewrite Model

DNS rewrite configuration:

Attribute	Type	Required	Default	Description
direction	DnsRewriteDirection	Yes	None	DNS rewrite direction

Move Model

NatRuleMoveModel

Model for NAT rule move operations:

Attribute	Type	Required	Default	Description
destination	NatMoveDestination	Yes	None	Where to move the rule (top, bottom, before, after)
rulebase	NatRulebase	Yes	None	Which rulebase to use (pre or post)
destination_rule	UUID	No*	None	UUID of the reference rule for before/after moves

* Required when destination is before or after

Exceptions

The NAT Rule models can raise the following exceptions during validation:

• ValueError: Raised in several scenarios:
  • When multiple container types (folder/snippet/device) are specified for create operations
  • When no container type is specified for create operations
  • When multiple source translation types are provided (must be exactly one)
  • When both translated_address and interface_address are provided (or neither) for dynamic_ip_and_port
  • When bi-directional static NAT is used with destination translation in the same rule
  • When DNS rewrite is used with NAT64 rule type
  • When name pattern validation fails
  • When list fields contain duplicate values
  • When field length limits are exceeded
  • When destination_rule is missing for before/after moves
  • When destination_rule is provided for top/bottom moves

Model Validators

Container Type Validation

For create operations, exactly one container type must be specified:

from scm.models.network.nat_rules import NatRuleCreateModel

# This will raise a validation error - multiple containers
try:
    nat_rule = NatRuleCreateModel(
        name="invalid-rule",
        folder="Texas",
        device="fw01",  # Can't specify both folder and device
        nat_type="ipv4"
    )
except ValueError as e:
    print(e)  # "Exactly one of 'folder', 'snippet', or 'device' must be provided."

Source Translation Validation

When specifying source translation, exactly one translation type must be provided:

from scm.models.network.nat_rules import SourceTranslation

# This will raise a validation error - multiple translation types
try:
    source_translation = SourceTranslation(
        dynamic_ip_and_port={"translated_address": ["192.168.1.1"]},
        dynamic_ip={"translated_address": ["192.168.1.2"]}  # Can't specify multiple
    )
except ValueError as e:
    print(e)  # "Exactly one of dynamic_ip_and_port, dynamic_ip, or static_ip must be provided"

DynamicIpAndPort Validation

For dynamic IP and port translation, exactly one of translated_address or interface_address must be provided:

from scm.models.network.nat_rules import DynamicIpAndPort

# This will raise a validation error - neither provided
try:
    dynamic = DynamicIpAndPort()
except ValueError as e:
    print(e)  # "Either translated_address or interface_address must be provided, but not both"

# This will raise a validation error - both provided
try:
    dynamic = DynamicIpAndPort(
        translated_address=["192.168.1.1"],
        interface_address={"interface": "ethernet1/1"}
    )
except ValueError as e:
    print(e)  # "Either translated_address or interface_address must be provided, but not both"

Bidirectional NAT Compatibility Validation

Bi-directional static NAT cannot be used with destination translation:

from scm.models.network.nat_rules import NatRuleCreateModel

# This will raise a validation error
try:
    nat_rule = NatRuleCreateModel(
        name="invalid-rule",
        folder="Texas",
        source_translation={
            "static_ip": {
                "translated_address": "192.168.1.100",
                "bi_directional": "yes"
            }
        },
        destination_translation={
            "translated_address": "192.168.2.100"  # Can't use with bi-directional
        }
    )
except ValueError as e:
    print(e)  # "Bi-directional static NAT cannot be used with destination translation..."

NAT64 DNS Rewrite Validation

DNS rewrite is not available with NAT64 rules:

from scm.models.network.nat_rules import NatRuleCreateModel

# This will raise a validation error
try:
    nat_rule = NatRuleCreateModel(
        name="invalid-rule",
        folder="Texas",
        nat_type="nat64",
        destination_translation={
            "translated_address": "192.168.1.100",
            "dns_rewrite": {"direction": "reverse"}  # Not available with NAT64
        }
    )
except ValueError as e:
    print(e)  # "DNS rewrite is not available with NAT64 rules"

Move Model Validation

Move configuration validation for NAT rule reordering:

from scm.models.network.nat_rules import NatRuleMoveModel

# This will raise a validation error - missing destination_rule
try:
    move = NatRuleMoveModel(
        destination="before",
        rulebase="pre"
        # Missing required destination_rule
    )
except ValueError as e:
    print(e)  # "destination_rule is required when destination is 'before'"

# This will raise a validation error - destination_rule not needed
try:
    move = NatRuleMoveModel(
        destination="top",
        rulebase="pre",
        destination_rule="123e4567-e89b-12d3-a456-426655440000"  # Not allowed for top
    )
except ValueError as e:
    print(e)  # "destination_rule should not be provided when destination is 'top'"

Usage Examples

Creating a Basic Source NAT Rule (Dynamic IP and Port)

from scm.client import Scm

# Initialize client
client = Scm(
    client_id="your_client_id",
    client_secret="your_client_secret",
    tsg_id="your_tsg_id"
)

# Using dictionary
snat_dict = {
    "name": "outbound-snat",
    "description": "Dynamic IP/Port source NAT for outbound traffic",
    "folder": "Texas",
    "from": ["trust"],
    "to": ["untrust"],
    "source": ["10.0.0.0/24"],
    "destination": ["any"],
    "source_translation": {
        "dynamic_ip_and_port": {
            "translated_address": ["192.168.1.100", "192.168.1.101"]
        }
    }
}

response = client.nat_rule.create(snat_dict)
print(f"Created NAT rule: {response.name} (ID: {response.id})")

Creating a Destination NAT Rule

from scm.client import Scm

# Initialize client
client = Scm(
    client_id="your_client_id",
    client_secret="your_client_secret",
    tsg_id="your_tsg_id"
)

# Create destination NAT rule (port forwarding)
dnat_config = {
    "name": "web-server-dnat",
    "description": "Port forwarding to internal web server",
    "folder": "Texas",
    "from": ["untrust"],
    "to": ["trust"],
    "source": ["any"],
    "destination": ["203.0.113.10"],
    "service": "tcp-80",
    "destination_translation": {
        "translated_address": "10.0.0.100",
        "translated_port": 8080
    }
}

response = client.nat_rule.create(dnat_config)
print(f"Created destination NAT rule: {response.name}")

Creating a Static IP NAT Rule with Bi-directional Support

from scm.client import Scm

# Initialize client
client = Scm(
    client_id="your_client_id",
    client_secret="your_client_secret",
    tsg_id="your_tsg_id"
)

# Create a bi-directional static NAT rule
static_nat_config = {
    "name": "server-static-nat",
    "description": "Bi-directional static NAT for server",
    "folder": "Texas",
    "from": ["any"],
    "to": ["any"],
    "source": ["10.0.0.10"],
    "destination": ["any"],
    "source_translation": {
        "static_ip": {
            "translated_address": "192.168.1.100",
            "bi_directional": "yes"
        }
    }
}

response = client.nat_rule.create(static_nat_config)
print(f"Created static NAT rule: {response.name}")

Creating a NAT Rule with Interface Address

from scm.client import Scm

# Initialize client
client = Scm(
    client_id="your_client_id",
    client_secret="your_client_secret",
    tsg_id="your_tsg_id"
)

# Create a NAT rule using interface address
interface_nat_config = {
    "name": "interface-snat",
    "description": "Source NAT using interface address",
    "folder": "Texas",
    "from": ["trust"],
    "to": ["untrust"],
    "source": ["10.0.0.0/24"],
    "destination": ["any"],
    "source_translation": {
        "dynamic_ip_and_port": {
            "interface_address": {
                "interface": "ethernet1/1"
            }
        }
    }
}

response = client.nat_rule.create(interface_nat_config)
print(f"Created interface NAT rule: {response.name}")

Updating a NAT Rule

from scm.client import Scm

# Initialize client
client = Scm(
    client_id="your_client_id",
    client_secret="your_client_secret",
    tsg_id="your_tsg_id"
)

# Fetch existing NAT rule
existing = client.nat_rule.fetch(name="outbound-snat", folder="Texas")

# Modify attributes using dot notation
existing.description = "Updated dynamic IP/Port source NAT"
existing.source = ["10.0.0.0/24", "10.0.1.0/24"]
existing.source_translation = {
    "dynamic_ip_and_port": {
        "translated_address": ["192.168.1.100", "192.168.1.101", "192.168.1.102"]
    }
}

# Pass modified object to update()
updated = client.nat_rule.update(existing)
print(f"Updated NAT rule: {updated.name}")

Moving a NAT Rule

from scm.client import Scm

# Initialize client
client = Scm(
    client_id="your_client_id",
    client_secret="your_client_secret",
    tsg_id="your_tsg_id"
)

# Move a NAT rule to the top of the rulebase
move_config = {
    "destination": "top",
    "rulebase": "pre"
}

rule_id = "123e4567-e89b-12d3-a456-426655440000"
client.nat_rule.move(rule_id, move_config)
print(f"Moved rule {rule_id} to the top")

# Move a NAT rule before another rule
move_before_config = {
    "destination": "before",
    "rulebase": "pre",
    "destination_rule": "987fcdeb-51d3-a456-426655440000"
}

client.nat_rule.move(rule_id, move_before_config)
print(f"Moved rule {rule_id} before the specified rule")