HP Web Jetadmin Software Manuale Utente Scaricare il pdf (Pagina 18)

APPENDIX C—SETTING REALISTIC IP RANGES

IP range discovery can perform to expectations when the range data has been correctly developed. It

is very easy to configure ranges that are larger than needed, causing the discovery to take a long

time and sometimes yield few devices. For example, a class A range could easily be developed for

the HP intranet but would take weeks to complete. The class A range that represents HP’s intranet is:

15.0.0.1 – 15.255.255.254

which represents over 16 million address combinations. On most large networks, the majority of these

addresses won’t answer the HP Web Jetadmin query and will cause timeouts to occur, leading to very

long discovery times.

Setting ranges based on subnets or contiguous subnets

In reality, most networks are divided into subnets. Subnets can be used to describe a network IP

addressing scheme and generally reflect the actual portions of the network being used. These subnets,

when put together into one list, represent an IP map. This type of a map can be obtained from an IT

or network infrastructure team. HP strongly recommends that you discuss plans for implementing

HP Web Jetadmin discoveries with these teams.

A subnet within a large network can be described with a network number and a subnet mask. A

typical combination might look like this:

Network number example: 15.5.188.0

Subnet mask example: 255.255.252.0

This is one subnet with an IP range of 15.5.188.1 through 15.5.191.254 and up to 1,022 possible

addresses. It may take HP Web Jetadmin only about 10 minutes to discover devices—depending on

the network, the number of devices, and the host running HP Web Jetadmin.

NOTE IP address calculators are an easy way to analyze IP networks. Many free versions of IP

calculators exist and can be obtained on the web.

An example of IP range planning

A hypothetical network has 20 subnets. All of these subnets use the same subnet mask of

255.255.255.0. Here are the network numbers that represent 20 subnets:

15.0.1.0, 15.0.2.0, 15.0.3.0, 15.0.4.0, 15.0.5.0, 15.0.30.0, 15.0.31.0, 15.0.32.0,

15.0.33.0, 15.0.34.0, 15.0.35.0, 15.0.36.0, 15.0.37.0, 15.0.38.0, 15.0.39.0, 15.0.55.0,

15.0.64.0, 15.0.65.0, 15.0.66.0, 15.0.67.0., 15.0.68.0, 15.0.69.0, 15.0.70.0, 15.0.71.0,

15.0.72.0, 15.0.73.0, 15.0.74.0

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HP Web Jetadmin Software Manuale Utente Pagina 18