Outside local address-The IP address of an outside host as it appears to the inside network.Inside global address-A routable IP address assigned by the NIC or service provider that represents one or more inside local IP addresses to the outside world.Typically, the address is from a private address space. Inside local address-The IP address assigned to a host on the inside network.This glossary is fundamental to understand and describe NAT In other words, NAT makes non-routable addresses routableįigure 2 Shows the topology referenced in the illustrations that follow. Note: It may help to think of NAT as an aid to route IP packets into and out of networks using private address space. NAT is bidirectional- If A gets translated to B on the inside interface, B arriving at outside interface will get translated to A!.Typically, NAT configurations change only the IP address of inside hosts.appear like) a single public IP address, to access the Internet. Enables multiple hosts in a private subnet to share (i.e.NAT basically replaces the IP address within packets with a different IP address.Furthermore, the scope is limited to components that make up the MS-Voice technology. Rather, this document aims to provide a comprehensive review of NAT as it is used in Cisco’s VoIP networks. The purpose of this document is not to review NAT. Network Address Translation is a commonly used technique to translate IP addresses on packets that flow between networks using different address spaces. If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. The information in this document is based on Prerequisites RequirementsĬisco recommends that you have knowledge of these topics: This document describes NAT ( Network Address Translation) behavior in routers working as CUBE (Cisco Unified Border Element), CME or CUCME (Cisco Unified Cummunication Manager Express), Gateways and CUSP (Cisco Unified SIP Proxy).
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