HP t1000 T1500/T1510 Windows-based Terminal Network Installation Guide - Page 31

Option 18 vs. Option 43 vs. Options 128+, Option 18, Table 2-3, Labels and Data for Text Format Option

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Configuring Terminal Start-Up Resources 17 Option 18 vs. Option 43 vs. Options 128+ All three methods (Option 18, Option 43, Option 128+) provide identical capabilities, just in different manners. It is recommended that only one method be used, but you are not restricted to this. Things to take into consideration when choosing include the following: existence of a TFTP server, level of configurability in the DHCP server, availability of a binary file editor, knowledge of DHCP option data format, and the number of other devices that are going to be administered via DHCP. Option 18 Option 18 is a standard DHCP option that provides the network address and pathame of a file to be obtained via TFTP. The standard format of this file (RFC-defined) is a set of DHCP options (option number, length, data), terminated with the end (255) option. Since in most cases this format is very difficult to edit, a text file format is also supported where the options are of the form LABEL=DATA, all entries are one per line, and all are ASCII data. Any option that can be passed as DHCP option data can be stored in the binary format; only those which are actually supported by the terminal are allowed in text format. All 128+ options as described above are also allowed in an option 18 file. Table 2-3 lists the labels and data for the text format options. Table 2-3 Labels and Data for Text Format Option Option Number Label Notes 1 Not allowed. 3 ROUTER Put here with extreme caution. 4 TIMESERVER Not currently used. 6 Not allowed. 9 LPRSERVER Not currently used. 12 HOSTNAME Put here with extreme caution. 15 Not allowed. 17 Not allowed. 18 Not allowed. 28 Not allowed.

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Configuring Terminal Start-Up Resources
17
Option 18 vs. Option 43 vs. Options 128+
All three methods (Option 18, Option 43, Option 128+) provide identical
capabilities, just in different manners. It is recommended that only one method be
used, but you are not restricted to this. Things to take into consideration when
choosing include the following: existence of a TFTP server, level of configurability in
the DHCP server, availability of a binary file editor, knowledge of DHCP option data
format, and the number of other devices that are going to be administered via
DHCP.
Option 18
Option 18 is a standard DHCP option that provides the network address and
pathame of a file to be obtained via TFTP. The standard format of this file
(RFC-defined) is a set of DHCP options (option number, length, data), terminated
with the end (255) option. Since in most cases this format is very difficult to edit, a
text file format is also supported where the options are of the form LABEL=DATA,
all entries are one per line, and all are ASCII data. Any option that can be passed
as DHCP option data can be stored in the binary format; only those which are
actually supported by the terminal are allowed in text format. All 128+ options as
described above are also allowed in an option 18 file.
Table 2-3 lists the labels and data for the text format options.
Table 2-3
Labels and Data for Text Format Option
Option
Number
Label
Notes
1
Not allowed.
3
ROUTER
Put here with extreme caution.
4
TIMESERVER
Not currently used.
6
Not allowed.
9
LPRSERVER
Not currently used.
12
HOSTNAME
Put here with extreme caution.
15
Not allowed.
17
Not allowed.
18
Not allowed.
28
Not allowed.