Grass Valley Network Attached Storage System Serial ATA Network User Guide v.1.0.06 - Manual (Page 106)

Digital News Production 105
Entering IP Addresses
An Internet Protocol (IP) address is a unique identification for any machine on
the Internet. An IP address has the form: 216.27.72.326
Each of the four groups of numbers separated by a period is called an octet
(because internally they are represented by 8 binary numbers). An IP address has
two components:
• The net portion of an IP address always includes the first octet. The net portion
identifies the network to which the computer belongs.
• The host (or server node) portion always includes the last octet. The host
portion of an IP address identifies the specific computer within the network.
The Default Network has 0.0.0.0 for an IP address. IP addresses are grouped by
class. A NewsShare NAS system might use any of the following classes:
• Class A is for very large networks. The net portion of all IP addresses in this
class of networks is the first octet, which can be between 1 and 126. The last
three octets are used for host nodes. An example of a Class A IP address is
net = 124. and host = 24.53.107
• Class B is for medium-sized networks. The net portion of all IP addresses in
this class of networks is the first two octets, where the first octet is between
128 and 191. (The first octet 127. is reserved for a special purpose.) The last
two octets are used for the host nodes. An example of a Class B IP address is
net = 144.24. and host = 53.107.
• Class C is for small to mid-sized networks. The net portion of all IP addresses
in this class of networks is the first three octets, where the first octet is between
192 and 223. The last octet is used for the host nodes. An example of a Class
C IP address is net = 195.24.53. and host = 107.
The gateway for a network controls messages into and out of that network. The
gateway uses a netmask to filter out IP addresses that are not appropriate for the
class of the network. For example, the netmask 255.255.0.0 is commonly used
for a gateway on a Class B network. This tells the gateway which part of the IP
address to pay attention to and which to ignore.