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Extranet VPN Business Scenario 4-5

Step 1—Configuring Network Address Translation

2 Verifying Static Inside Source Address Translation

Statictranslation establishes a one-to-onemapping between your internallocal address and

an inside global address. Static translation is useful when a host on the inside must be

accessible by a ﬁxed address from the outside.

Note For detailed, additional conﬁguration information on NAT—for example,

instructions on how to conﬁgure dynamic translation—refer to the “Conﬁguring IP

Addressing” chapter in the Network Protocols Conﬁguration Guide, Part 1. NAT is also

described in RFC 1631.

NAT uses the following deﬁnitions:

• Inside local address—The IP address that is assigned to a host on the inside network.

The address is probably not a legitimate IP address assigned by the Network

Information Center (NIC) or service provider.

• Inside global address—A legitimate IP address (assigned by the NIC or service

provider) that represents one or more inside local IP addresses to the outside world.

• Outside local address—The IP address of an outside host as it appears to the inside

network. Not necessarily a legitimate address, it was allocated from address space

routable on the inside.

• Outside global address—The IP address assigned to a host on the outside network by

the host’s owner. The address was allocated from globally routable address or network

space.

Figure 4-3 illustrates a router that is translating a source address inside a network to a

source address outside the network.

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Cisco 7100 Series Spezifikationen Seite 77