Ipx Addressing; Netmasks - Lucent Technologies PortMaster 4 Configuration Manual

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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.

A netmask is a four-octet number that identifies either a supernetwork (supernet) or a

subnetwork (subnet). A netmask that designates a subnet is called a subnet mask.

Using Subnet Masks to Create IP Subnets

Subnet masks are used to divide networks into smaller, more manageable groups of

hosts known as subnets. Subnetting is a scheme for imposing a hierarchy on hosts on a

single physical network. The usual practice is to use the first few bits in the host portion

of the network address for a subnet field. RFC 950, Internet Standard Subnetting Procedure,

describes subnetting.

Networking Concepts

00000003:0001 8423 4567

Network segment

address

Node address

Network Addressing

A-5

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