User Manual

VCom Inc.
AP5857 Manual; ml_ap5857_08 (Oct 2005)
Approved: R.B.
35
7.2 Network Address
An address with all host bits set to "0" is used to address the network as a whole
(in routing entries, for example).
7.3 Broadcast Address
An address with the host part bits all set to “1“ is the broadcast address, meaning “for every station“.
Network and Broadcast addresses must not be used as a host address (e.g. 192.168.0.0 identifies the entire
network, 192.168.0.255 identifies the broadcast address).
7.4 IP Netmask
The netmask is used to divide the IP address differently from the standard defined by the classes A, B, C.
By entering a netmask, it is possible to define how many bits from the IP address are to be taken as the
network part and how many bits are to be taken as the host part.
Standard IP Network Netmask: Class A 8 (network) 24 (host) 255.0.0.0 (mask)
Class B 16 (network) 16 (host) 255.255.0.0 (mask)
Class C 24 (network) 8 (host) 255.255.255.0 (mask)
7.5 Private IP networks and the Internet
If your network is not connected to the Internet and there are no plans to make such a connection, you may
use any IP address you wish.
However, if you are not connected to the Internet and have plans to connect to the Internet, or you are
connected to the Internet and want to operate your VCom SNMP Interface on an Intranet, you should use
one of the following sub-networks for your network: Class A 10.x.x.x
Class B 172.16.x.x
Class C 192.168.0.x
These network numbers have been reserved for such networks. If you have any questions about IP address
assignment ask your Network Administrator.
7.6 Network RFC’s
For more information regarding IP addressing see the following documents. These can be located on the
World Wide Web.
RFC 950 Internet Standard Subnetting Procedure
RFC 1700 Assigned Numbers
RFC 1117 Internet Numbers
RFC 1597 Address Allocation for Private Internets