HP Web Jetadmin Software Manuel d'utilisateur télécharger pdf (Page 8)

Figure 2—IP Hostname and System Name

 Make sure a device is unique before starting any data collections on it.

 After a valid serial number is added to a device that has been collecting data, the historical data

from that device will be unavailable. This is because the device with the new valid serial number

is treated as a new device, unrelated to the data collected from the device when it did not have a

serial number.

 Make sure devices stay unique by following the proper HP procedure when replacing an

HP device’s formatter board (ensure the serial number is re-written to the new formatter board).

IP hostname vs. system name

In the HP Web Jetadmin device list, the IP Hostname

column is enabled by default. The column is populated

with a value from the hosting system name resolve API

(Gethostbyaddr). This request is based on the device’s IP

address and is sometimes called a reverse lookup. The

host uses a number of methods to resolve names that are

not covered in this document, but that include DNS

(Domain Name System) and WINS (Windows Internet

Name Service). If the system is unable to resolve device

name information the column will display <Unknown>.

Figure 2, at right, shows an IP Hostname column example

where both name values and <Unknown> exists.

NOTE: HP Web Jetadmin uses a call to Windows to get

device IP Hostname and then stores this value into an SQL

table along with many other device details. Web

Jetadmin puts a time-to-live setting on the IP hostname

attribute and won’t check back with Windows name

services until the value is at least 24 hours old. In most cases, Windows acquires this same value

from a DNS server (some environments may vary). Windows has a default DNS cache setting of 24

hours. See Microsoft documentation regarding DNS, name services and also adjusting DNS cache

settings.

System Name is another column heading, but it is not enabled by default. This reflects the System

Name object that is stored on the HP Jetdirect network interface. This object is a proprietary HP item

and is also called sysName. It may seem confusing that HP calls the sysName item “Host Name”

within the HP Jetdirect embedded web server (EWS) configuration interface, but there is a reason for

this.

The System Name, which in and of itself is not resolvable by the computer hosting HP Web Jetadmin,

can be registered into network name services like DNS and WINS. This is key to understanding why

in HP Web Jetadmin the System Name is sometimes mirrored in the IP Hostname column. Some

HP Jetdirect devices can have a WINS address configured on them. If this item is configured on the

HP Jetdirect interface, the System Name value could be registered with the WINS server on the

network and the system hosting HP Web Jetadmin, if it is

using WINS, could resolve that name making it appear in

the IP Hostname column. As well, a DHCP (Dynamic Host

Configuration Protocol)-configured HP Jetdirect interface

(for some versions) can register the System Name value

onto DNS by way of the DHCP process. If this occurs, and

if the computer hosting HP Web Jetadmin resolves names

via DNS (this is very common), the System Name value

also appears in the IP Hostname column. Read the

HP Jetdirect documentation to further understand both of

Best practices

Learn and understand your IT

department’s implementation of name

services as well as the settings on the

HP Web Jetadmin host computer.

Both of these items are key to

understanding the result in the

HP Web Jetadmin IP Hostname

column.

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HP Web Jetadmin Software Manuel d'utilisateur Page 8

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