Справочник Пользователя для Lantronix 10
UDP
8-14
UDS-10 User Guide
8.4 IP Addresses
Each TCP/IP node on a network host has a unique IP address. This address provides the
information needed to forward packets on the local network and across multiple networks if
necessary.
information needed to forward packets on the local network and across multiple networks if
necessary.
IP addresses are specified as x.x.x.x, where each x is a number from 1 to 254; for example,
192.0.1.99. The Device Server must be assigned a unique IP address to use TCP/IP network
functionality.
192.0.1.99. The Device Server must be assigned a unique IP address to use TCP/IP network
functionality.
IP addresses contain three pieces of information: the network, the subnet, and the host.
8.4.1 Network Portion
The network portion of the IP address is determined by the network type: Class A, B, or C.
Table 31 - Network Portion of IP Address
Network Class
Network Portion of Address
Class A
First byte (2nd, 3rd, and 4th bytes are the host)
Class B
First 2 bytes (3rd and 4th bytes are the host)
Class C
First 3 bytes (4th byte is the host)
In most network examples, the host portion of the address is set to zero.
Table 32 - Available IP Addresses
Class Reserved
Available
A 0.0.0.0
127.0.0.0
1.0.0.0 to 126.0.0.0
B 128.0.0.0
191.255.0.0
128.1.0.0 to 191.254.0.0
C 192.0.0.0
223.255.255.0
192.0.1.0 to 223.255.254.0
D, E
224.0.0.0 to 255.255.255.254
255.255.255.255
255.255.255.255
None (Check this)
Consider the IP address 36.1.3.4. This address is a Class A address; therefore, the network
portion of the address is 36.0.0.0 and the host portion is 1.3.4.
portion of the address is 36.0.0.0 and the host portion is 1.3.4.
8.4.2 Subnet Portion
The subnet portion of the IP address represents which sub-network the address is from. Sub-
networks are formed when an IP network is broken down into smaller networks using a
subnet mask.
networks are formed when an IP network is broken down into smaller networks using a
subnet mask.