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CHAPTER 2
Configuring NAT
Overview
Copyright © 2010, Juniper Networks, Inc.
This chapter describes how to configure Network Address Translation (NAT) on your
ERX router; it contains the following sections:
Overview on page 61
Platform Considerations on page 62
References on page 62
NAT Configurations on page 63
Network and Address Terms on page 64
Understanding Address Translation on page 65
Address Assignment Methods on page 66
Order of Operations on page 66
PPTP and GRE Tunneling Through NAT on page 67
Packet Discard Rules on page 68
Before You Begin on page 68
Configuring a NAT License on page 68
Limiting Translation Entries on page 69
Specifying Inside and Outside Interfaces on page 69
Defining Static Address Translations on page 70
Defining Dynamic Translations on page 71
Clearing Dynamic Translations on page 76
NAT Configuration Examples on page 77
Tunnel Configuration Through NAT Examples on page 83
GRE Flows Through NAT on page 84
Monitoring NAT on page 85
The Internet faces the challenges of conserving IP address space while continuing to
provide scalability in routing. Network Address Translation (NAT) helps address these
challenges by allowing the conservation of registered IP addresses within private networks
and simplifying IP addressing management tasks through a form of transparent routing.
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