Lucent Technologies PortMaster, Configuration Manual

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Network Addressing
A-6 PortMaster Configuration Guide
IP Address Conventions
If the bits in the host portion of an address are all 0, that address refers to the network
specified in the network portion of the address. For example, the class C address
192.31.7.0 refers to a particular network. Historically, this address was used as a
broadcast.
The standard for broadcast is high, which uses all 1s in the host portion (for example,
192.168.1.255); however, many networks still use all 0s. The PortMaster can be
configured either way and should be set to match the other systems on your network.
Note – Do not assign an IP address with all 0s or all 1s in the host portion of the address
to a host on the network, because these are reserved as broadcast addresses.
With CIDR, networks are specified with an IP prefix and netmask length—for example,
172.16.0.0/16, 192.168.1.0/24, or 192.168.200.240/28.
IPX Addressing
An IPX address consists of 10 bytes (expressed in hexadecimal notation), which gives an
IPX network host a unique identifier. IPX addresses are made up of the following two
parts:
• Network segment address, expressed as 8 hexadecimal digits
These 4 bytes (32 bits) specify on which network segment the node resides.
• Node address, expressed as dotted triplets of 4-digit hexadecimal numbers
These 6 bytes (48 bits) provide the media access control (MAC) address of the node.
The two elements of the IPX address are separated by a colon. For example:
The first 8 digits represent the network segment, and the following 12 digits represent
the node or MAC address of the node. All digits are expressed in hexadecimal.
✍
00000003:0001 8423 4567
Network segment
address
Node address