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# Platform Considerations

For information about modules that support NAT on ERX-14xx models, ERX-7xx models, and the ERX-310 router:

- See ERX Module Guide, Table 1, Module Combinations for detailed module specifications.
- See ERX Module Guide, Appendix A, Module Protocol Support for information about the modules that support NAT.

  | Note: The E120 router and the E320 router do not support configuration of NAT.

## Module Requirements

To configure NAT on ERX-7xx models, ERX-14xx models, and the ERX-310 router, you must install a Service Module (SM). For information about installing modules in E-series routers, see the ERX Hardware Guide.

Unlike other line modules, SMs do not pair with corresponding I/O modules that contain ingress and egress ports. Instead, they receive data from and transmit data to other line modules with access to ingress and egress ports on their own associated I/O modules.

For a list of the modules that support NAT, see ERX Module Guide, Appendix A, Module Protocol Support.

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