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Interface characteristics for 1) private and 2) public network segments

Private Network Segments, Demand Dial interfaces

Each proxy server interface connect to either a private network or public network segment. Private network segments are based on local area network (LAN) technologies that are persistent interfaces.
The data rate of the private network segment is determined by the LAN technology, such as 100 megabits per second (Mbps) data transfer rate for 100 Mbps Fast Ethernet.
Public network segments are based on LAN and demand-dial technologies that can be persistent or non-persistent.
Public network segments that appear to Proxy Server as LAN interfaces are persistent, and the data rate is determined by the LAN technology.
Public network segments that appear as demand-dial interfaces are non-persistent, 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 kps.
If the public network segments are based on LAN technologies, you include demand-dial interfaces in your solutions, such as a VPN connection over a digital subscriber line (DSL) connection.
Include a demand-dial interface in your design
  1. If an exchange of credentials is required to perform authentication, such as VPN tunnel authentication
  2. If charges, such as ISDN connection charges, are accumulated when the public network segment is active.

Internet addressing architecture

In the Internet addressing architecture, a private network is a network that uses private IP address space, following the standards set by RFC 1918 for Internet Protocol Version 4 (IPv4), and RFC 4193 for Internet Protocol Version 6 (IPv6). These addresses are commonly used for home, office, and enterprise local area networks (LANs), when globally routable addresses are not mandatory, or are not available for the intended network applications. Under IPv4, the private IP address spaces were originally defined in an effort to delay IPv4 address exhaustion, but they are also a feature of IPv6, the next generation Internet Protocol.
These addresses are characterized as private because they are not globally delegated, meaning that they are not allocated to any specific organization, and IP packets addressed with them cannot be transmitted through the public Internet. Anyone may use these addresses without approval from a regional Internet registry (RIR). If such a private network needs to connect to the Internet, it must use either a network address translator (NAT) gateway, or a proxy server.