Chapter 16: Network Address Translation Configuration Guide

Setting NAT Rules

Static

You create NAT static bindings by entering the following command in Configure mode.

Enable NAT with static address binding.

Dynamic

nat create static protocol iptcpudp

local-ip<local-ip-add/address range> global-ip<global-ip-add/address range> [local-port<tcp/udp local-port>any][global-port<tcp/udp global-port>any]

You create NAT dynamic bindings by entering the following command in Configure mode.

Enable NAT with dynamic address binding.

nat create dynamic local-acl-pool <local- acl> global-pool <ip-addr/ip-addr-range/ip-addr-list/ip-addr-mask>[matches-interface <interface>] [enable-ip-overload]

For dynamic address bindings, you define the address pools with previously-created ACLs. You can also specify the enable-port-overloadparameter to allow PAT.

Forcing Flows through NAT

If a host on the outside global network knows an inside local address, it can send a message directly to the inside local address. By default, the SSR will route the message to the destination. You can force all flows between the inside local pool and the outside global network to be translated. This prevents a host on the outside global network from being allowed to send messages directly to any address in the local address pool.

You force address translation of all flows to and from the inside local pool by entering the following command in Configure mode.

Force all flows to and from local address pool to be translated.

nat set secure-plus onoff

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Cabletron Systems 9032578-05 manual Forcing Flows through NAT, Setting NAT Rules, Static, Dynamic