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Integrating NAT into the existing Network

NAT server placement on the private network.

1. Isolate the network traffic to the source destination and intermediary network segments. 2. Create a screened subnet within the private network, thereby protecting confidential data. 3. Exchange network packets between dissimilar network segments, such as between an ethernet network segment and (ISDN) Integrated Services Digital Network. an IP address and subnet mask.

be within the range of addresses that are assigned to the network segment that is directly connected to the interface.

Match the subnet mask that is assigned to the network segment, which is directly connected to the interface.

These network segments can be persistent or non-persistent. Another way of referring to persistence is to think of a connection as dedicated versus dial-up
  1. A dedicated network connection is persistent
  2. A dial-up connection is non-persistent

specify the data rate and persistence for each NAT server interface, so that the NAT server can connect to private and public network segments.

The data rate of the private network segment is determined by the local area network (LAN) technology.
Such as a 100 megabits per second (Mbps) data transfer rate for 100 Mbps Ethernet.

Public network segments that appear to the NAT server as LAN interfaces are persistent, and the data rate is determined by the LAN technology.

Public network segments that appear as dial-up or demand-dial interfaces are nonpersistent, and the data rate is determined by the underlying technology.
An example of this would be a 56 kbps dial-up modem connection that supports a maximum data rate of 56 kbps.
you can include demand-dial interfaces, such as a VPN connection over a digital subscriber line (DSL) connection.
Include a demand-dial interface in your solution when an exchange of credentials, such as VPN, tunnel authentication, is required to perform authentication, or when charges such as ISDN connection charges are accumulated.