Tripp Lite SNMP Solo MT-SE-37/02 User Manual
Tripp Lite
Appendix
31
number of octets reserved for the network ID and the number of
octets reserved for the host ID.
octets reserved for the host ID.
Class
Value of First
Octet
Network ID
Host ID
Number of
Hosts
A
1-126
first octet
last three octets
16,387,064
B
128-191
first two octets
last two octets
64,516
C
192-223
first three
octets
last octet
254
Any value between 0 and 255 is valid as a host ID octet except
for those values the InterNIC reserves for other purposes.
for those values the InterNIC reserves for other purposes.
Value
Purpose
0, 255
Subnet masking
127
Loopback testing and interprocess communication
on local devices
on local devices
224-254
IGMP multicast and other special protocols
Subnetting and Subnet Masks
Subnetting divides a network address into subnetwork
addresses to accommodate more than one physical network on
a logical network.
addresses to accommodate more than one physical network on
a logical network.
For example: A Class B company has 100 LANs (Local Area
Networks) with 100 to 200 nodes on each LAN. To classify the
nodes by its LANs on one main network, this company
segments the network address into 100 subnetwork addresses.
(If the Class B network address is 150.1.x.x, the address can be
segmented further from 150.1.1.x through 150.1.100.x.)
Networks) with 100 to 200 nodes on each LAN. To classify the
nodes by its LANs on one main network, this company
segments the network address into 100 subnetwork addresses.
(If the Class B network address is 150.1.x.x, the address can be
segmented further from 150.1.1.x through 150.1.100.x.)
A subnet mask is a 32-bit value that distinguishes the network
ID from the host ID for different subnetworks on the same
logical network. Like IP addresses, subnet masks consist of four
octets in dotted decimal notation. You can use subnet masks to
route and filter the transmission of IP packets among your
subnetworks. The value “255” is assigned to octets that belong
to the network ID, and the value “0” is assigned to octets that
belong to the host ID.
ID from the host ID for different subnetworks on the same
logical network. Like IP addresses, subnet masks consist of four
octets in dotted decimal notation. You can use subnet masks to
route and filter the transmission of IP packets among your
subnetworks. The value “255” is assigned to octets that belong
to the network ID, and the value “0” is assigned to octets that
belong to the host ID.
For the example above, if you want all the devices on the
subnetworks to receive each other’s IP packets, set the subnet
mask to 255.255.0.0. If you want the devices on a single
subnetwork only to receive IP packets from other devices on its
subnetworks to receive each other’s IP packets, set the subnet
mask to 255.255.0.0. If you want the devices on a single
subnetwork only to receive IP packets from other devices on its