Cisco GRS User Manual

Configuring the Dynamic Port Ranges for NAT44
Perform this task to configure dynamic port ranges for TCP, UDP, and ICMP ports. The default value range
of 0 to 1023 is preserved and not used for dynamic translations. Therefore, if the value of dynamic port range
start is not configured explicitly, the dynamic port range value starts at 1024.
SUMMARY STEPS
1.
configure
2.
service cgn instance-name
3.
service-type nat44 nat1
4.
dynamic port range start value
5.
end or commit
6.
DETAILED STEPS
PurposeCommand or Action
Enters global configuration mode.configure
Example:
RP/0/RP0/CPU0:router# configure
Step 1
Configures the instance named cgn1 for the CGN
application and enters CGN configuration mode.
service cgn instance-name
Example:
RP/0/RP0/CPU0:router(config)# service cgn cgn1
RP/0/RP0/CPU0:router(config-cgn)#
Step 2
Configures the service type keyword definition for NAT44
application.
service-type nat44 nat1
Example:
RP/0/RP0/CPU0:router(config-cgn)# service-type nat44
nat1
Step 3
Configures the value of dynamic port range start for a CGN
NAT 44 instance. The value can range from 1 to 65535.
The default value is 1024.
dynamic port range start value
Example:
RP/0/RP0/CPU0:router(config-cgn-nat44)# dynamic port
range start 666
Step 4
Saves configuration changes.end or commit
Example:
RP/0/RP0/CPU0:router(config-cgn-ivrf-sport-inside)#
end
Step 5
•
When you issue the end command, the system
prompts you to commit changes:
Uncommitted changes found, commit them before
exiting (yes/no/cancel)?
or
RP/0/RP0/CPU0:router(config-cgn-ivrf-sport-inside)#
commit
[cancel]:
◦
Entering yes saves configuration changes to the
running configuration file, exits the
Cisco IOS XR Carrier Grade NAT Configuration Guide for the Cisco CRS Router, Release 5.2.x
46 OL-32659-01
Implementing Carrier Grade NAT on Cisco IOS XR Software
Configuring the Policy Functions for the Carrier Grade NAT

Cisco GRS Specifications

General

Product Type	Router
Port Interfaces	Multiple 10GE, 40GE, and 100GE ports
Operating System	Cisco IOS XR
Redundancy	Yes
Power Supply	Dual or multiple power supplies

Summary

Preface

Changes to This Document

Lists technical changes made to the document since its first release.

Obtaining Documentation and Submitting a Service Request

Information on obtaining documentation, using Cisco Bug Search Tool, and submitting service requests.

New and Changed Carrier Grade NAT Feature Information

New and Changed Carrier Grade NAT Features

Lists features introduced or changed in Cisco IOS XR Carrier Grade NAT configuration.

Implementing Carrier Grade NAT on Cisco IOS XR Software

Carrier Grade NAT Overview and Benefits

Provides an overview of Carrier Grade NAT implementation and its advantages.

Information About Carrier Grade NAT

Details information about implementing NAT using ICMP and TCP protocols.

Cisco Carrier NAT Applications

Lists applications deployed on the CGSE line card for Carrier Grade NAT.

Policy Functions

Explains various policy functions related to Carrier Grade NAT.

Implementing Carrier Grade NAT on Cisco IOS XR Software

Details tasks to get started with CGN configuration.

Configuration Examples for Implementing the Carrier Grade NAT

Provides practical examples for configuring Carrier Grade NAT.

External Logging

Bulk Port Allocation

Allocates blocks of ports to reduce volume of log data generated by NAT sessions.

Session logging

Includes destination IP and port information in NAT translation records for Netflow or Syslog.

Syslog Logging

Configures Syslog logging for NAT table entries.

Frequently Asked Questions (FAQs)

Answers common questions about external logging features.