Conversion Mapping

The following topics describe how the migration tool converts an ASA configuration to a Firepower Threat Defense configuration:

Conversion Mapping Overview

The migration tool converts an ASA configuration into a Firepower Threat Defense configuration as follows:

Table 1 Summary of Conversion Mapping

Entity

ASA Configuration

Firepower Threat Defense Configuration

Network objects

Network objects

Network object groups

Nested network object groups

Network objects

Network object groups

Nested network object groups

Service objects

Service objects

Service object groups

Nested service object groups

Port objects

Port object groups

Flattened port object groups

Access rules

Access rules

Access control policy or prefilter policy (as selected)

NAT rules

Twice NAT rules

Network object NAT rules

Manual NAT rules

Auto NAT rules

Naming Conventions for Converted Configurations

The migration tool uses the naming conventions described below when converting ASA access rules, NAT rules, and related objects to Firepower Threat Defense equivalents.

Object and Object Group Names

When converting objects and object groups, the migration tool retains the names of the objects and groups from the ASA configuration file.

For example:

object network obj1
 host 1.2.3.4
object network obj2
 range 1.2.3.7 1.2.3.10
 subnet 10.83.0.0 255.255.0.0
object-group network obj_group1
 network-object object obj1
 network-object object obj2

The tool converts this configuration to network objects named obj1 and obj2 and a network object group named obj_group1.

When converting service objects and service groups to port objects and port object groups, the tool can in certain cases append the following extensions to the original object or group name:

Table 2 Extensions for Converted Service Objects and Groups

Extension

Reason for Appending

_dst

Splits a service object with source and destination ports into two port objects. The system appends this extension to the service object used to store the converted destination port data. For more information, see Service Objects with Source and Destination Ports.

_src

Splits a service object with source and destination ports into two port objects. The system appends this extension to the service object used to store the converted source port data. For more information, see .

_#

Converts a nested service group; see Nested Service Group Conversion.

Policy Names

The ASA configuration file contains a hostname parameter that specifies the host name for the ASA. The migration tool uses this value to name the policies it creates when converting the file:

  • Access control policy—hostname-AccessPolicy-conversion_date

  • Prefilter policy—hostname-PrefilterPolicy-conversion_date

  • NAT policy—hostname-NATPolicy-conversion_date

Rule Names

For converted access control, prefilter, and NAT rules, the system names each new rule using the following format:

ACL_name-#rule_index

where:

  • ACL_name—The name of the ACL to which the rule belonged.

  • rule_index—A system-generated integer specifying the order in which the rule was converted relative to other rules in the ACL.

For example:

acl1#1

If the system must expand a single access rule to multiple rules during service object conversion, the system appends an extension:

ACL_name#rule_index_sub_index

where the appended # represents the position of the new rule in the expanded sequence.

For example:

acl1#1_1

acl1#1_2

If the system determines that the rule name is longer than 30 characters, the system shortens the ACL name and terminates the compressed name with a tilde (~):

ACL Name~#rule index

For example, if the original ACL name is accesslist_for_outbound_traffic, the system truncates the ACL name to:

accesslist_for_outbound_tr~#1

Security Zone and Interface Group Names

When the migration tool converts access-group commands in an ASA configuration file, the tool captures ingress and egress information in the command by creating either security zones or interface groups (depending on choices you make during converstion). It uses the following format to name these new security zones or interface groups:

ACL_name_interface_name_direction_keyword_zone

where:

  • ACL_name—The name of the ACL from the access-group command.

  • interface_name—The name of the interface from the access-group command.

  • direction_keyword—The direction keyword (in or out) from the access-group command.

For example:

access-list acp1 permit tcp any host 209.165.201.3 eq 80
access-group acp1 in interface outside

The tool converts this configuration to a security zone or interface group named acp1_outside_in_zone.

Fields Specific to Firepower Objects and Object Groups

Firepower network and port objects/groups contain a small number of fields that are not present in ASA objects and groups. The migration tool populates these Firepower-specific fields in converted network and port objects/groups with the following default values:

Table 3 Default Values for Fields Specific to Firepower Objects/Groups

Field in Firepower Objects/Groups

Default Value for Converted ASA Objects/Groups

Domain

None

Override

False

For more information on these default values, see Documentation Conventions.

Access Rule Conversion

The migration tool can convert ASA access rules to either access control rules or prefilter rules, depending on choices you make during migration.

Access Rule Conversion to Access Control Rules

If you choose to convert ASA access rules to Firepower Threat Defense access control rules:

  • The system adds the converted rules to the Default rule section of the access control policy.

  • The system retains Description field contents as an entry in the Comment History for the rule.

  • The system adds an entry to the Comment History, identifying the rule as converted.

  • The system sets the access control rule's Action as follows:

    Access Rule's Action

    Access Control Rule's Action

    Permit

    Allow or Trust, depending on the choice you make during migration

    Deny

    Block

  • The system sets the access control rule's Source Zones and Destination Zones as follows:

    ACL Type

    Source Zones

    Destination Zones

    Global (applied to Any interface)

    Any

    Any

    Applied to specific interfaces

    The security zone you choose during import

    Any

  • If the access rule is inactive, the tool converts it to a disabled access control rule.

The migration tool assigns the converted rules to an access control policy with the following default parameters:

  • The system sets the default action for the new access control policy to Block All Traffic.

  • The system associates the access control policy with the default prefilter policy.

Access Rule Fields Mapped to Access Control Rule Fields

The migration tool converts fields in ASA access rules to fields in Firepower Threat Defense access control rules as described in the table below.

Note:

  • Field names in Column 1 (ASA Access Rule Field) correspond to field labels in the ASDM interface.

  • Field names in Column 2 (Firepower Access Control Rule Field) correspond to field labels in the Firepower Management Center interface.

Table 4 ASA Access Rule Fields Mapped to Firepower Access Control Rule Fields

ASA Access Rule Field

Firepower Access Control Rule Field

Interface

No equivalent field

Action

Action

Source

Source Networks

User

Does not convert; equivalent to Selected Users condition

Security Group (Source)

Does not convert; equivalent to custom SGT condition

Destination

Destination Networks

Security Group (Destination)

No equivalent field

Service

Selected Destination Port; if predefined service object is specified, does not convert

Description

Comment

Enable Logging/Logging Level

Log at Beginning of Connection/Log at End of Connection. If logging is enabled in the ACE at a non-default logging level, the tool enables connection logging for the converted rule at both the beginning and end of the connection. If logging is enabled in the ACE at the default level, the tool disables connection logging for the converted rule.

Logging Interval

No equivalent field

Enable Rule

Enabled

Traffic Direction

No equivalent field

Source Service

Selected Source Port; if predefined service object is specified, does not convert

Time Range

No equivalent field

Note
If the ACE has the log option with a log level assigned, it is enabled. The ACE without a log level is considered as disabled. ACE log level is disabled if it is associated with a default log level.

Fields Specific to Access Control Rules

Firepower Threat Defense access control rules contain a small number of fields that are not present in ASA access rules. The migration tool populates these Firepower-specific fields in converted access control rules with the following default values:

Table 5 Default Values for Fields Specific to Access Control Rules

Access Control Rules Field

Default Value for Converted Access Rules

Name

System-generated (see Naming Conventions for Converted Configurations)

Source Zone

  • If the ACL is applied globally, Any

  • If the ACL is applied to a specific interface, the Security Zone that the tool creates during conversion

Destination Zone

Any (default for all access control rules)

Selected VLAN Tags

No default (you can manually add condition after import)

Selected Applications and Filters

No default (you can manually add condition after import)

Selected URLs

No default (you can manually add condition after import)

Access Rule Conversion to Prefilter Rules

If you choose to convert ASA access rules to Firepower Threat Defense prefilter rules:

  • The system retains the Description field contents as an entry in the Comment History for the rule.

  • Adds an entry to the Comment History identifying the rule as converted.

  • The system sets the prefilter rule's Action as follows:

    Access Rule's Action

    Prefilter Rule's Action

    Permit

    Fastpath or Analyze, depending on the choice you make during migration

    Deny

    Block

  • The system sets the prefilter rule's Source Interface Objects and Destination Interface Objects as follows:

    ACL Type

    Source Interface Objects

    Destination Interface Objects

    Global (applied to Any interface)

    Any

    Any

    Applied to specific interfaces

    The interface group you choose during import

    Any

  • If the access rule is inactive, the tool converts it to a disabled prefilter rule.

The migration tool assigns the converted rules to a prefilter policy with the following default parameters:

  • The system sets the default action for the new prefilter policy to Analyze All Tunnel Traffic.

  • The system creates an access control policy with the same name as the prefilter policy, and then associates the prefilter policy with that access control policy. The system sets the default action for the new access control policy to Block All Traffic.

Access Rule Fields Mapped to Prefilter Rule Fields

The migration tool converts fields in ASA access rules to fields in Firepower Threat Defense prefilter rules as described in the table below.

Note:

  • Field names in Column 1 (ASA Access Rule Field) correspond to field labels in the ASDM interface.

  • Field names in Column 2 (Firepower Prefilter Rule Field) correspond to field labels in the Firepower Management Center interface.

Table 6 ASA Access Rule Fields Mapped to Firepower Prefilter Rule Fields

ASA Access Rule Field

Firepower Prefilter Rule Field

Interface

No equivalent field

Enable Rule

Enabled

Action

Action

Source

Source Networks

User

No equivalent field

Security Group (Source)

No equivalent field

Destination

Destination Networks

Security Group (Destination)

No equivalent field

Service

Selected Source Port

Selected Destination Port

Description

Comment

Enable Logging/Logging Level

Log at Beginning of Connection/Log at End of Connection. If logging is enabled in the ACE at a non-default logging level, the tool enables connection logging for the converted rule at both the beginning and end of the connection. If logging is enabled in the ACE at the default level, the tool disables connection logging for the converted rule.

Logging Interval

No equivalent field

Traffic Direction

No equivalent field

Source Service

Selected Source Port; if predefined service object is specified, does not convert

Time Range

No equivalent field

Fields Specific to Firepower Prefilter Rules

Firepower Threat Defense prefilter rules contain a small number of fields that are not present in ASA access rules. The migration tool populates these Firepower-specific fields in converted prefilter rules with the following default values:

Table 7 Default Values for Fields Specific to Firepower Prefilter Rules

Prefilter Rule Field

Default Value for Converted Access Rules

Name

System-generated (see Naming Conventions for Converted Configurations)

Source Interface Objects

  • If the ACL is applied globally, Any

  • If the ACL is applied to a specific interface, the Interface Group that the tool creates during conversion

Destination Interface Objects

Any (default for all prefilter rules)

Selected VLAN Tags

No default (you can manually add condition after import)

Port Argument Operators in Access Rules

An extended access rule can contain a port_argument element that uses the same operators used in service objects. The migration tool converts these operators in access rules slightly differently than it does the same operators when it converts service objects, depending on whether the access rule contains a single port argument operator or multiple port argument operators.

The following table lists the possible operators and gives an example of single operator use.

Table 8 Port Argument Operators in Access Rules

Operator

Description

Example

lt

Less than.

 
access-list acp1 extended permit tcp any lt 300

gt

Greater than.

 
access-list acp2 extended permit tcp any gt 300

eq

Equal to.

 
access-list acp3 extended permit tcp any eq 300

neq

Not equal to.

 
access-list acp4 extended permit tcp any neq 300

range

An inclusive range of values. When you use this operator, specify two port numbers, for example, range 100 200.

 
access-list acp5 extended permit tcp any range 9000 12000

If the access rule contains a single port argument operator, the migration tool converts the access rule to a single access control or prefilter rule, as follows:

Table 9 Access Rules with Single Port Argument Operators Converted to Access Control or Prefilter Rules

Op

Name

Src Zone

Dest Zone

Src Network

Dest Network

Src Port

Dest Port

Action

Enabled

lt

acp1#1

Any

Any

Any

Any

1-299

Any

Permit equivalent

True

gt

acp2#1

Any

Any

Any

Any

301-65535

Any

Permit equivalent

True

eq

acp3#1

Any

Any

Any

Any

300

Any

Permit equivalent

True

neq

acp4#1

Any

Any

Any

Any

1-299, 301-65535

Any

Permit equivalent

True

range

acp5#1

Any

Any

Any

Any

9000-2000

Any

Permit equivalent

True

The Original Operator (Op) column in this table is provided for clarity; it does not represent a field in the access control rule.

If an access rule contains multiple port operators (for example, access-list acp6 extended permit tcp any neq 300 any neq 400), the migration tool converts the single access rule to multiple access control or prefilter rules, as follows:

Table 10 Access Rules with Multiple Port Argument Operators Converted to Access Control Rules

Op

Name

Src Zone

Dest Zone

Src Network

Dest Network

Src Port

Dest Port

Action

Enabled

neq

acp6#1_1

Any

Any

Any

Any

1-299

1-399

Permit equivalent

True

neq

acp6#1_2

Any

Any

Any

Any

301-65535

1-399

Permit equivalent

True

neq

acp6#1_3

Any

Any

Any

Any

1-299

401-65535

Permit equivalent

True

neq

acp6#1_4

Any

Any

Any

Any

301-65535

401-65535

Permit equivalent

True

The Original Operator (Op) column in this table is provided for clarity; it does not represent a field in the access control rule.

Access Rules that Specify Multiple Protocols

In ASA, you can configure source and destination ports in access rules to use protocol service objects that specify multiple protocols (for example, TCP and UDP). For example:

object-group protocol TCPUDP
 protocol-object udp
 protocol-object tcp
access-list acp1 extended permit object-group TCPUDP any any

In the Firepower System, however, you can only configure access control or prefilter rules as follows:

  • Both source and destination ports must specify the same protocol.

  • The destination port can specify multiple protocols, but the source port must specify none.

Access rules that contain protocol object groups tcp and udp are migrated as unsupported rules. And therefore the rule is disabled with a comment Object Group Protocol containing both tcp and udp is not supported.

NAT Rule Conversion

NAT for ASA and NAT for Firepower Threat Defense support equivalent functionality, as summarized in the table below.

Table 11 ASA NAT Policies Mapped to Firepower Threat Defense NAT Policies

ASA NAT Policy

Firepower Threat Defense NAT Policy

Defining Characteristics

Twice NAT

Manual NAT

  • Specifies both the source and destination address in a single rule.

  • Configured directly.

  • Can use network object groups.

  • Manually ordered in the NAT table (before or after auto NAT rules).

Network object NAT

Auto NAT

  • Specifies either a source or a destination address.

  • Configured as a parameter of a network object.

  • Cannot use network object groups.

  • Automatically ordered in the NAT table.

The migration tool converts ASA NAT configurations to Firepower Threat Defense NAT configurations. However, the tool cannot convert ASA NAT configurations that use unsupported network objects; in such cases, the conversion fails.

ASA NAT Rule Fields Mapped to Firepower Threat Defense Rule Fields

The migration tool converts fields in ASA NAT rules to fields in Firepower Threat Defense NAT rules as described in the table below.

Note:

  • Field names in Column 1 (ASA NAT Rule Field) correspond to field labels in the ASDM interface.

  • Field names in Column 2 (Firepower Threat Defense Rule Field) correspond to field labels in the Firepower Management Center interface.

Table 12 ASA NAT Rule Fields Mapped to Firepower Threat Defense NAT Rule Fields

ASA NAT Rule Field

Firepower Threat Defense Rule Field

Original Packet - Source Interface

Interface Objects - Source Interface Objects

Original Packet - Source Address

Original Packet - Original Source

Original Packet - Destination Interface

Interface Objects - Destination Interface Objects

Original Packet - Destination Address

Original Packet - Original Destination - Address Type

Original Packet - Original Destination - Network

Original Packet - Service

Original Packet - Original Source Port

Original Packet - Original Destination Port

Translated Packet - Source NAT Type

Type

Translated Packet - Source Address

Translated Packet - Translated Source - Address Type

Translated Packet - Translated Source - Network

Translated Packet - Destination Address

Translated Packet - Translated Destination

Translated Packet - Service

Translated Packet - Translated Source Port

Translated Packet - Translated Destination Port

Use one-to-one address translation

Advanced - Net to Net Mapping

PAT Pool Translated Address

PAT Pool - PAT - Address Type

PAT Pool - PAT - Network

Round Robin

PAT Pool - Use Round Robin Allocation

Extend PAT uniqueness to per destination instead of per interface

PAT Pool - Extended PAT Table

Translate TCP and UDP ports into flat range 1024-65535

PAT Pool - Flat Port Range

Include range 1-1023

PAT Pool - Include Reserve Ports

Enable Block Allocation

No equivalent

Use IPv6 for source interface PAT

No equivalent

Use IPv6 for destination interface PAT

Advanced - IPv6

Enable rule

Enable

Translate DNS replies that match this rule

Advanced - Translate DNS replies that match this rule

Disable Proxy ARP on egress interface

Advanced - Do not proxy ARP on Destination Interface

Lookup route table to locate egress interface

No equivalent

Direction

Advanced - Unidirectional

Description

Description

Network Object and Network Object Group Conversion

Network objects and network object groups identify IP addresses or host names. In both ASA and Firepower Threat Defense, these objects and groups can be used in both access and NAT rules.

In ASA, a network object can contain a host, a network IP address, a range of IP addresses, or a fully qualified domain name (FQDN). In the Firepower System, network objects support these same values with the exception of FQDN.

The migration tool converts an ASA network object or group once, regardless of whether the object is used in multiple access or NAT rules.

Network Object Conversion

For each ASA network object it converts, the migration tool creates a Firepower network object.

The migration tool converts fields in ASA network objects to fields in Firepower network objects as follows:

Table 13 ASA Network Object Fields Mapped to Firepower Network Object Fields

ASA Network Object Field

Firepower Network Object Field

Name

System-generated; see Naming Conventions for Converted Configurations

Type

Type

IP Version

No equivalent field

IP Address

Value

Netmask

Value (included in CIDR notation)

Description

Description

Object NAT Address

No equivalent field

Example: Network Object in an Access Control List

If the following commands are present in the ASA configuration file:

object network obj1
 host 1.2.3.4
object network obj2
 range 1.2.3.7 1.2.3.10
object network obj3
 subnet 10.83.0.0 255.255.0.0
access-list sample_acl extended permit ip object obj1 object obj2 
access-list sample_acl extended permit ip object obj3 object obj1
access-group gigabitethernet_access_in in interface gigabitethernet1/1

The system converts these objects as follows:

Name

Domain

Value (Network)

Type

Override

obj1

None

1.2.3.4

Host

False

obj2

None

1.2.3.7-1.2.3.10

Address Range

False

obj3

None

10.83.0.0/16

Network

False

Example: Network Object in a NAT Rule

If the following command is present in the ASA configuration file:

nat (gigabitethernet1/1,gigabitethernet1/2) source static obj1 obj1

The system converts object obj1 in this rule the same way it converts object obj1 in the access rule example above.

Network Object Group Conversion

For each ASA network object group it converts, the migration tool creates a Firepower network object group. It also converts the objects contained in the group, if they have not already been converted.

The migration tool converts fields in ASA network object groups to fields in Firepower network object groups as follows:

Table 14 ASA Network Object Group Fields Mapped to Firepower Network Object Group Fields

ASA Network Object Group Field

Firepower Network Object Group Field

Group Name

Name

Description

Description

Members in Group

Value (Selected Networks)

Example: Network Object Group in an Access Control List

If the following commands are present in the ASA configuration file:

object network obj1
 host 1.2.3.4
object network obj2
 range 1.2.3.7 1.2.3.10
object network obj3
 subnet 10.83.0.0 255.255.0.0
object-group network obj_group1
 network-object object obj1
 network-object object obj2
 network-object object obj3
access-list sample_acl extended permit ip object-group obj_group1 any
access-group gigabitethernet_access_in in interface gigabitethernet1/1

The system creates the following network group:

Name

Domain

Value (Networks)

Type

Override

obj_group1

None

obj1

obj2

obj3

Group

False

If the associated objects have not already been converted, the system converts them objects as described in Network Object Conversion.

Example: Network Object Group in a NAT Rule

If the following command is present in the ASA configuration file:

nat (interface1,interface2) source static obj_group1 obj_group1

The system converts obj_group1 in this rule the same way it converts obj_group1 in the access rule example above.

Service Object and Service Group Conversion

In ASA, service objects and service groups specify protocols and ports and designate those ports as source or destination ports. Service objects and groups can be used in both access and NAT rules.

In the Firepower System, port objects and port object groups specify protocols and ports, but the system designates those ports as source or destination ports only if you add the objects to access control, prefilter, or NAT rules. To convert service objects to equivalent functionality in the Firepower System, the migration tool converts service objects to port objects or groups and makes specific changes to related access control, prefilter, or NAT rules. As a result, during conversion, the migration tool might expand single security object and related access or NAT rules into multiple port objects/groups and related access control, prefilter, or NAT rules.

Service Object Conversion

The migration tool converts an ASA service object by creating one or more port objects and one or more access control or prefilter rules that reference those port objects.

The migration tool can convert the following service object types:

  • Protocol

  • TCP/UDP

  • ICMP/ICMPv6

The migration tool converts fields in ASA service objects to fields in Firepower port objects as follows:

Table 15 ASA Service Object Fields Mapped to Firepower Port Object Fields

ASA Service Object Field

ASA Service Object Type

Firepower Port Object Field

Name

Any

System-generated (see Naming Conventions for Converted Configurations)

Service Type

TCP/UDP, ICMP/ICMPv6

Protocol

Protocol

Protocol only

Protocol

Description

Any

No equivalent; content is discarded

Destination Port/Range

TCP/UDP only

Port

Source Port/Range

TCP/UDP only

Port

ICMP Type

ICMP/ICMPv6 only

Type

ICMP Code

ICMP/ICMPv6 only

Code

Port Literal Values in Service Objects

ASA service objects can specify port literal values, instead of port numbers. For example:

object service http
 service tcp destination eq www

Because the Firepower System does not support these port literal values, the migration tool converts the port literal values to the port numbers they represent. The tool converts the above example to the following port object:

Name

Type

Domain

Value (Protocol/Port)

Override

http

Object

None

TCP(6)/80

False

For a full list of port literal values and associated port numbers, see TCP and UDP Ports in CLI Book 1: Cisco ASA Series General Operations CLI Configuration Guide.

Port Argument Operators in Service Objects

ASA service objects can use the following operators in port arguments:

Table 16 Port Argument Operators in Service Objects

Operator

Description

Example

lt

Less than.

 
object service testOperator
 service tcp source lt 100

gt

Greater than.

 
object service testOperator
 service tcp source gt 100

eq

Equal to.

 
object service http-proxy
 service tcp source eq 8080

neq

Not equal to.

 
object service testOperator
 service tcp source neq 200

range

An inclusive range of values.

 
object service http-proxy
 service tcp source range 9000 12000

The migration tool converts these operators as follows:

Table 17 Service Objects with Port Argument Operators Converted to Port Objects/Groups

Operator

Converts to

Example Port Object Value (Protocol/Port)

lt

A single port object that specifies a range of port numbers less than the specified number.

 
TCP(6)/1-99

gt

A single port object that specifies a range of port numbers greater than the specified number.

 
TCP(6)/101-65535

eq

A single port object that specifies a single port number.

 
TCP(6)/8080

neq

Two port objects and a port object group. The first port object specifies a range lower than the specified port. The second port object specifies a range higher than the specified port. The port object group includes both port objects.

First object (testOperator_src_1):

TCP(6)/1-199

Second object (testOperator_src_2):

TCP(6)/201-65535
Object group (testOperator_src):
testOperator_src_1
testOperator_src_2

range

A single port object that specifies an inclusive range of values.

 
TCP(6)/9000-12000

Service Objects with Source and Destination Ports

In ASA, a single service object can specify ports for both source and destination. In the Firepower System, the port object specifies port values only. The system does not designate the port as source or destination until you use the port object in an access control or prefilter rule.

To accommodate this difference, when the migration tool converts an ASA service object that specifies both source and destination, it expands the single object into two port objects. It appends an extension to the object names to indicate their original designations, _src for source ports and _dst for destination ports.

Example
object service http-proxy
 service tcp source range 9000 12000 destination eq 8080

The tool converts this service object into the following port objects:

Name

Type

Domain

Value (Protocol/Port)

Override

http-proxy_src

Object

None

TCP(6)/9000-12000

False

http-proxy_dst

Object

None

TCP(6)/8080

False

Example: Protocol Service Object Conversion

ASA Configuration:

object service protocolObj1
 service snp 
 description simple routing

Converts to:

Table 18 Port Object

Name

Type

Domain

Value (Protocol)

Override

protocolObj1

Object

None

SNP (109)

False

Example: TCP/UDP Service Object Conversion

ASA configuration:

object service servObj1
 service tcp destination eq ssh

Converts to:

Table 19 Port Object

Name

Type

Domain

Value (Protocol/Port)

Override

servObj1

Object

None

TCP(6)/22

False

Example: ICMP/ICMPv6 Service Object Conversion

ICMP

ASA configuration:

object service servObj1
 service icmp alternate-address 0

Converts to:

Table 20 Port Object

Name

Type

Domain

Value (Protocol/Type:Code)

Override

servObj1

Object

None

ICMP(1)/Alternate Host Address: Alternate Address for Host

False
ICMPv6

ASA configuration:

object service servObj1
 service icmp6 unreachable 0

Converts to:

Table 21 Port Object

Name

Type

Domain

Value (Protocol/Type:Code)

Override

servObj1

Object

None

IPV6-ICMP (58)/Destination Unreachable:no route to destination

False

Service Group Conversion

The migration tool converts an ASA service group by creating port object groups and associating those port object groups with the related access control or prefilter rules.

The migration tool can convert the following service group types:

  • Protocol

  • TCP/UDP

  • ICMP/ICMPv6

The migration tool converts fields in ASA service objects to fields in Firepower port objects as follows:

Table 22 ASA Service Group Fields Mapped to Firepower Port Object Fields

ASA Service Group Field

Port Object Group Field

Name

System-generated (see Naming Conventions for Converted Configurations)

Description

Description

Members in Group

Selected Ports

Nested Service Group Conversion

Example

ASA supports nested service groups (that is, service groups that contain other service groups). The Firepower System does not support nested port object groups; however, you can achieve equivalent functionality by associating multiple groups with a single access control or prefilter rule. When converting nested service groups, the migration tool "flattens" the group structure, converting the innermost service objects and groups to port objects and port object groups, and associating those converted groups with access control or prefilter rules.

You can associate up to 50 port objects with a single access control or prefilter rule. If the number of new port objects exceeds 50, the tool creates duplicate access control or prefilter rules until it has associated all of the new port objects with a rule.

The Firepower system rules containing nested service objects that are used as both source and destination services are not supported.

object-group service http-8081 tcp
 port-object eq 80
 port-object eq 81

object-group service http-proxy tcp
 port-object eq 8080

object-group service all-http tcp
 group-object http-8081
 group-object http-proxy

access-list FMC_inside extended permit tcp host 33.33.33.33 object-group all-http host 33.33.33.33 object-group all-http

In the example above, service objects http-8081 and http-proxy are nested within the all-http service group.

In such a scenario, the rules pertaining to the port objects are ignored. The system imports the objects but disables the related access control or prefilter rule, and adds the following comment to the rule: Nested service groups at both Source and Destination are not supported.

For a description of the naming conventions the tool uses for converted service objects, service groups, and any duplicate rules the system might create during their conversion, see Naming Conventions for Converted Configurations

Example

ASA configuration:

object-group service legServGroup1 tcp
	port-object eq 78
	port-object eq 79
object-group service legServGroup2 tcp
	port-object eq 80
	port-object eq 81
object-group service legacyServiceNestedGrp tcp
	group-object legServGroup1
	group-object legServGroup2
access-list  acp1 extended permit tcp  3.4.5.0  255.255.255.0  5.6.7.0 255.255.255.0 object-group legacyServiceNestedGrp
access-group acp1 global

Converts to:

Table 23 Port Object Groups

Name

Type

Domain

Value (Protocol/Port)

Override

legServGroup1_1

Object

None

TCP(6)/78

False

legServGroup1_2

Object

None

TCP(6)/79

False

legServGroup2_1

Object

None

TCP(6)/80

False

legServGroup2_2

Object

None

TCP(6)/81

False

legServGroup1

Group

None

legServGroup1_1

legServGroup1_2

False

legServGroup2

Group

None

legServGroup2_1

legServGroup2_2

False
Table 24 Access Control or Prefilter Rule

Name

Src Zone

Dest Zone

Src Network

Dest Network

Src Port

Dest Port

Action

Enabled

acp1#1

Any

Any

3.4.5.0/24

5.6.7.0/24

TCP(6)

legServGroup1

legServGroup2

Permit equivalent

True

Example: Protocol Service Group Conversion

ASA configuration:

object-group protocol TCPUDP
 protocol-object udp
 protocol-object tcp

Converts to:

Table 25 Port Objects and Groups

Name

Type

Domain

Value (Protocol/Port)

Override

TCPUDP_1

Object

None

TCP(6)

False

TCPUDP_2

Object

None

UDP(17)

False

TCPUDP

Group

None

TCPUDP_1

TCPUDP_2

False

Example: TCP/UDP Service Group Conversion

Objects Created During Group Creation

In ASA, you can create objects on-the-fly during service group creation. These objects are categorized as service objects, but the entry in the ASA configuration file uses port-object instead of object service. Because these objects are not independently created, the migration tool uses a slightly different naming convention than it does for objects created independently of group creation.

ASA configuration:

object-group service servGrp5 tcp-udp
 port-object eq 50
 port-object eq 55

Converts to:

Table 26 Port Objects and Groups

Name

Type

Domain

Value (Protocol/Port)

Override

servGrp5_1

Object

None

TCP(6)/50

False

servGrp5_2

Object

None

TCP(6)/55

False

servGrp5

Group

None

servGrp5_1

servGrp5_2

False
Objects Created Independently from Group

ASA configuration:

object service servObj1
 service tcp destination eq ssh 
object service servObj2
 service udp destination eq 22 
object service servObj3
 service tcp destination eq telnet 
object-group service servGrp1
 service-object object servObj1 
 service-object object servObj2 
 service-object object servObj3

Converts to:

Table 27 Port Objects and Groups

Name

Type

Domain

Value (Protocol/Port)

Override

servObj1

Object

None

TCP(6)/22

False

servObj2

Object

None

UDP(17)/22

False

servObj3

Object

None

TCP(6)/23

False

servGrp1

Group

None

servObj1

servObj2

servObj3

False

Example: ICMP/ICMPv6 Service Group Conversion

ICMP

ASA configuration:

object-group icmp-type servGrp4
 icmp-object echo-reply

Converts to:

Table 28 Port Objects and Groups

Name

Type

Domain

Value (Protocol/Port)

Override

servGrp4_1

Object

None

ICMP(1)/Echo Reply

False

servGrp4

Group

None

servGrp4_1

False
ICMPv6

ASA configuration:

object-group service servObjGrp3
 service-object icmp6 packet-too-big
 service-object icmp6 parameter-problem

Converts to:

Table 29 Port Objects and Groups

Name

Type

Domain

Value (Protocol/Port)

Override

servObjGrp3_1

Object

None

IPV6-ICMP(58)/2

False

servObjGrp3_2

Object

None

IPV6-ICMP(58)/4

False

servObjGrp3

Group

None

servObjGrp3_1

servObjGrp3_2

False

Access-Group Conversion

In ASA, to apply an ACL, you enter the access-group command in the CLI, or you choose Apply in the ASDM access rule editor. Both of these actions result in an access-group entry in the ASA configuration file (see example below).

The access-group command specifies the interface where the system applies the ACL and whether the system applies the ACL to inbound (ingress) or outbound (egress) traffic on that interface.

In the Firepower System, to configure equivalent functionality, you:

  • Create a security zone, associate the security zone with an interface, and add the security zone to access control rules as either a Source Zone condition (for inbound traffic) or a Destination Zone condition (for outbound traffic).

  • Create an interface group, associate the interface group with an interface, and add the interface group to prefilter rules as either a Source Interface Group condition (for inbound traffic) or a Destination Interface Group condition (for outbound traffic).

When converting the access-group command, the migration tool captures ingress and egress information by creating either security zones or interface groups and adding the security zones and interface groups as conditions in the related access control or prefilter rules. However, the migration tool retains the interface information in the name of the security zone or interface group, but it does not convert any related interface or device configurations, which you must add manually after importing the converted policies. After importing the converted policies, you must associate the policies manually with devices, and security zones or interface groups with interfaces.

When converting ACLs, the system positions globally-applied rules after rules applied to specific interfaces.

Special Cases

If the ASA configuration applies a single ACL to both ingress and egress interfaces, the tool converts the ACL to two sets of access control or prefilter rules:

  • a set of ingress rules (enabled)

  • a set of egress rules (disabled)

If the ASA configuration applies a single ACL both globally and to a specific interface, the tool converts the ACL to two sets of access control or prefilter rules:

  • a set of rules associated with the specific interface (enabled)

  • a set of rules with source and destination zone set to Any (enabled)

Example: ACL Applied Globally

ASA configuration:

access-list global_access extended permit ip any any 
access-group global_access global

The migration tool converts this configuration to:

Table 30 Access Control or Prefilter Rule

Name

Src Zone/Int Grp

Dest Zone/Int Grp

Src Network

Dest Network

Src Port

Dest Port

Action

Enabled

global_access#1

Any

Any

Any

Any

Any

Any

Permit equivalent

True

Example: ACL Applied to Specific Interface

ASA configuration:

access-list acp1 permit tcp any host 209.165.201.3 eq 80
access-group acp1 in interface outside

In this example, the access-group command applies the ACL named acp1 to inbound traffic on the interface named outside.

The migration tool converts this configuration to:

Table 31 Security Zone/Interface Group

Name

Interface Type

Domain

Selected Interfaces

acp1_outside_in_zone

  • Routed (if ASA device is running in routed mode)

  • Switched (if ASA device is running in transparent mode)

None

Any
Table 32 Access Control or Prefilter Rule

Name

Src Zone/Int Grp

Dest Zone/Int Grp

Src Network

Dest Network

Src Port

Dest Port

Action

Enabled

acp1#1

acp1_outside_in_zone

Any

Any

209.165.201.3

Any

TCP(6)/80

Permit equivalent

True