Private IP addresses, Public IP address | Hughes HN9000 specification

Chapter 6	HN9000 Satellite Modem User Guide –	Computer settings
	1037577-0001 Rev. A

Understanding the modem address and computer address

The satellite modem and any computer or computers that connect to it must each have their own identifying network address. This network address is known as an IP address. An IP address may be dynamic, meaning that it can change, or static, meaning that it is fixed—it does not change. An IP address may also be public (or routable), meaning that it can be used on the Intranet. A private IP address works on an internal network but not over the Internet. However, to gain access to the Internet, private addresses may be converted by a network address translation (NAT) service to a public IP address that can be used on the Internet. Both private and public addresses can be dynamic or static, although typically a private IP address is dynamic and a typically a public IP address is static.

Both the modem and a connected computer can have either type of address—private or public. The type used depends on requirements a customer might have and their service plan. A public IP address or addresses are available only if they are specified in the service plan. Typically home users use a private IP address, but some home users use a public IP address.

To find specific address information, go to the System Control Center System Information page Figure 17: Terminal Status page (top part) on page 19. Scroll down until you see Addressing in the left column. Look at the first three parameters in the Addressing field, as shown in the following two examples.

Private IP addresses

Figure Figure 27: Example of Addressing parameters showing available private IP addresses on page 38 is an example of System Information page address parameters for a satellite modem with a service plan that provides private IP addresses.

Figure 27: Example of Addressing parameters showing available private IP addresses

In this example, the satellite modem is assigned a private IP address (LAN Port Address) of 192.168.0.1.

There are 253 available private IP addresses that can be assigned to computers connecting to the satellite modem. These addresses are in the range from 192.168.0.2 to 192.168.0.254 (the Last Usable IP Address).

Public IP address

Figure Figure 28: Example of Addressing parameters showing one available public IP address on page 38 is an example of System Information page address parameters for a satellite modem with a service plan that provides one public IP address. Some service plans provide multiple public IP addresses.

Figure 28: Example of Addressing parameters showing one available public IP address

In this example, the satellite modem is assigned the public IP address (LAN Port Address) 97.73.73.65. The modem’s DHCP server has only one public IP address to assign to a connecting computer: 97.73.73.66 (the Last Usable IP Address).