# Configuring NAT

This chapter describes how to configure Network Address Translation (NAT) on your ERX router; it contains the following sections:

- Overview
- Platform Considerations
- References
- NAT Configurations
- Network and Address Terms
- Understanding Address Translation
- Address Assignment Methods
- Order of Operations
- PPTP and GRE Tunneling Through NAT
- Packet Discard Rules
- Before You Begin
- Configuring a NAT License
- Limiting Translation Entries
- Specifying Inside and Outside Interfaces
- Defining Static Address Translations
- Defining Dynamic Translations
- Clearing Dynamic Translations
- NAT Configuration Examples
- Tunnel Configuration Through NAT Examples
- GRE Flows Through NAT
- Monitoring NAT