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The Question is: hello I have the TCPIP on my vax machine. After i enable the service DHCP how do i create the table and write the relevent information in it. Thanks The Answer is :
http://www.openvms.digital.com:8000/72final/6526/6526profile_010.html#dhcp_chap
For the manual process for DHCP client configuration, please see
the following (erroneously omitted) documentation.
B
_________________________________________________________________
Defining DHCP Client Information Manually
After you run the TCPIP$CONFIG.COM procedure and enable
the DHCP server on your system, you can use the DHCP GUI
or manually define the following client information on a
case-by-case basis:
o Static, dynamic, or finite addressing
o Other identifying parameters, such as default gateways
and DNS domain names
________________________ Note ________________________
DHCP does not register newly configured hosts with the
Domain Name System.
______________________________________________________
This appendix contains information about how to define DHCP
client information manually by editing configuration files
and updating the binary databases. For information about
how to define client information using the DHCP GUI instead
of the manual procedures, see Section 7.3.
B.0.1 Tasks Involved
Defining client addressing and additional parameters
manually involves the following steps:
1. Modify the appropriate text-based configuration file(s).
The configuration files are located in
SYS$SYSDEVICE:[TCPIP$DHCP]. These files are listed in
Table B-1.
You manually edit the DHCP configuration files using a
text editor such as EDT, TPU, or LSE. Depending on your
environment, you may or may not need to modify all the
files.
Defining DHCP Client Information Manually B-1
Defining DHCP Client Information Manually
2. If appropriate, run DHCP utilities to update the binary
databases.
When you are modifying information already stored in
the databases, you use command line utilities to access
and update the database contents. These utilities are
defined as both OpenVMS and UNIX commands. Table B-2
lists the utilities. For information about how to use
them, see Appendix B.
3. Reinitialize the DHCP server for the changes to take
effect (Section B.0.9).
B.0.2 Configuration Files
The DHCP configuration files described in Table B-1 are
located in SYS$SYSDEVICE:[TCPIP$DHCP].
Table_B-1_DHCP_Configuration_Files_________________________
File
Name______Description______________________________________
SERVER.PCYDescribes the behavior of the server. For
example, this policy file tells you whether BOOTP
clients should be supported, the ping timeout
value, and so on.
You may need to make modifications to this file
to change the default settings. Some of the
defaults are support for BOOTP clients and assign
names by IP addresses.
DHCPCAP. Defines the client configuration parameters.
This file is similar to the standard bootptab
file used by most BOOTP servers. Each entry in
the file can describe a single host, all the
hosts within a subnet, or a group of hosts.
NETS. Defines the pool of IP addresses available to
the DHCP server to assign to clients. Used for
dynamic address assignments.
B-2 Defining DHCP Client Information Manually
Defining DHCP Client Information Manually
Table_B-1_(Cont.)_DHCP_Configuration_Files_________________
File
Name______Description______________________________________
NETMASKS. Defines network masks if the network is
subnetted.
NAMEPOOL. Defines the names available for assignment to
DHCP clients. The server uses the names only as a
last resort. For example, when the client did not
suggest a name and there is no name associated
__________with_the_IP_address_offered_to_the_client._______
Template copies of the DHCP configuration files are located
in SYS$LIBRARY:TCPIP$TEMPLATES.TLB. The template copies
provide instruction on how to edit the text files manually.
The SERVER.PCY template file contains information about the
various parameters you can set.
Sections B.0.4 through B.0.9 describe how to edit the
DHCP configuration files and reinitialize the server.
For information about the configuraition symbols you
use to define parameters in the configuration files, see
Section B.1.
B.0.3 Utility Commands for Manipulating Databases
The commands you use to modify and look at the contents of
the DHCP databases are listed in Table B-2. TCP/IP Services
supplies the UNIX type commands for UNIX users familiar
with the JOIN product's DHCP server.
Defining DHCP Client Information Manually B-3
Defining DHCP Client Information Manually
Table_B-2_DHCP_Utility_Commands_Associated_with_Databases__
OpenVMS UNIX
Command_____Command__Description___________________________
dhcpdbmod jdbmod Modifies lease and naming information
in the database. Allows you to
preassign static IP addresses to
clients. Also allows you to create,
delete, or modify existing entries.
dhcpdbreg jdbreg Populates the database with MAC
addresses of known clients. Each
record to be loaded is terminated by a
new line, and the fields within each
record are separated by the vertical
bar (|) character.
dhcpdbdump jdbdump Reads and outputs information stored
in the lease database files including
MAC address information, IP addresses,
and lease information. Each line of
output describes the lease information
for one client.
dhcpshowdbs showdbs Reads the same information described
for dhcpdbdump (above) except that the
output is in a format that is easier
to read.
dhcpdbshow dbshow Displays the contents of a single DHCP
_____________________binary_database.______________________
For information about how to enter the DHCP utility
commands, see Sections B.0.10 through B.0.12.
B.0.4 Modifying the Server Policy File
The SERVER.PCY file configures the behavior of the server.
This policy file describes various aspects of the server,
for example, what sort of name service to use, whether
BOOTP should be supported, and ping timeout value.
Separate entries in the SERVER.PCY file from one another
by new lines. The server ignores blank lines and comments
(lines beginning with the pound (#) symbol. Each new policy
option must begin and end on a separate line. A keyword
introduces a policy option. A policy option can be Boolean
B-4 Defining DHCP Client Information Manually
Defining DHCP Client Information Manually
or can take a value separated from the keyword by space
(but not a new line).
If an option occurs more than once, only the value attached
to the last occurrence takes effect; the server forgets the
earlier values.
B.0.5 Modifying the Client Configuration Parameters File
The DHCPCAP. file describes the various configuration
parameters for the clients. This file is similar to the
standard bootptab file used by most BOOTP servers. Each
entry in the file can describe a single machine (per-node
basis) or all the machines within a subnet (per-subnet
basis) or a group of machines (per-group basis).
B.0.5.1 Defining Static DHCP Addresses Manually
You can edit the DHCPCAP. file and assign a specific IP
address with a permanent lease time (a static address) to
a DHCP client. However, make sure you use the dhcpdbmod
command afterward to update the lease database (see
Section B.0.11).
B.0.5.2 DHCPCAP Configuration Syntax
The DHCPCAP. configuration file uses two-character, case-
sensitive symbols that represent host parameters. Colons
( : ) follow and separate parameters from one another. For
example, gw specifies gateway. For a list of the available
symbols, see Section B.1.
Use the syntax shown in Example B-1 and illustrated in
Example B-2.
Example B-1 DHCPCAP Configuration Syntax
host entryname:\
symbol=value: symbol=value: symbol=value:
o Host entry name is usually the name of the BOOTP or DHCP
client.
o Symbol is the two-character symbol that describes the
parameters to be associated with the client.
Defining DHCP Client Information Manually B-5
Defining DHCP Client Information Manually
o Value is a valid entry that represents the symbol. For
more information, see Section B.0.5.5.
Example B-2 Sample Single Host DHCPCAP File Entry
mypc:\
:ht=ether:\
:ha=112233445566:\
:ip=143.32.3.10:\
:gw=143.32.3.1:\
:dn=acme.com:
B.0.5.3 DHCPCAP Configuration Rules
Observe the following rules:
o Start each new host entry on a new line. You can make
a single entry span multiple lines by ending each line
with a backslash (\).
o Terminate each entryname and each symbol/value pair
with a colon ( : ). You can leave blank spaces between
symbol/value pairs for readability.
o Enter the entryname in the first field in the
configuration file entry.
o Make sure that the host hardware type (ht) precedes the
host hardware address (ha).
You can delete symbol values associated with a particular
client by entering an at sign (@) immediately following the
symbol. For example, gw@.
Both BOOTP and DHCP interpret lines that begin with any of
the following as commands:
o The pound sign (#)
o One or more blank spaces followed by #
o A blank line
B-6 Defining DHCP Client Information Manually
Defining DHCP Client Information Manually
B.0.5.4 DHCPCAP Configuration Examples
Example B-3 shows a sample single-host DHCPCAP. file entry.
This entry, mypc, describes the configuration for a BOOTP
client. It describes the client itself, its IP address, the
default gateway, and the domain name.
Example B-3 Sample Single Host DHCPCAP Entry
mypc:\
:ht=ether:\
:ha=112233445566:\
:ip=143.32.3.10:\
:gw=143.32.3.1:\
:dn=acme.com:
Example B-4 shows a subnet DHCPCAP. file entry. This entry,
subnet5, describes the parameters for all the clients on
a particular subnet, 143.32.5.0. It describes the default
gateway, subnet mask, domain name, DNS server address, and
lease time of the address.
Example B-4 Sample Subnet DHCPCAP Entry
subnet5:\
:nw=143.32.5.0:\
:gw=143.32.5.1:\
:sm=255.255.255.0:\
:dn=engr.acme.com:\
:ds=143.32.5.10:\
:lt=3600:
B.0.5.5 Symbol Value Formats
The symbol values require specific formats. Use only the
following formats:
o ASCII string
Enclose this string in double quotation marks ( "" ) if
it contains any of the special characters: colon ( : ),
pound sign ( # ), tab, or space.
o ASCII integer list
Defining DHCP Client Information Manually B-7
Defining DHCP Client Information Manually
A list of integers separated by white space consisting
of ASCII-format characters that represent an unsigned
hexadecimal, octal, or decimal integer.
- Begin the string with 0X or 0x if this is a
hexadecimal integer.
- Begin the string with zero ( 0 ) if this is an octal
integer.
o IP address list
ASCII string representing an IP address. Use dot-
notation formation (for example, 128.119.95.2). Valid
Internet address formats are:
- a.b.c.d.
- a.b.c (with c treated as 16 bits)
- a.b (with b treated as 24 bits)
- a. (with a treated as 32 bits)
An IP address list is a string of one or more IP
addresses, with the addresses separated by white space.
For example:
tg=128.119.91.2
tg=128.119.95.42 128.119.95.8
You can also use IP address lists to define DHCP address
ranges, routing policy filters, and static routes.
o Hexadecimal ASCII string
o ASCII-format representation of a hexadecimal integer
that DHCP and BOOTP interpret as a hardware address.
The ASCII string must have the correct number of
digits for the specified hardware type; for example,
twelve digits for a 48-bit Ethernet address. To improve
readability, you can:
- Separate the two-digit sequences (bytes) with hyphens
( - ).
- Separate the two-digit sequences (bytes) with periods
( . ).
- Add a 0x prefix to each byte (or only some bytes) of
the address.
B-8 Defining DHCP Client Information Manually
Defining DHCP Client Information Manually
- Add a hyphen between some bytes and 0x prefixes
before others.
- Add a period between some bytes and 0x prefixes
before others.
Examples of valid hexadecimal ASCII strings are:
ha=7F-FF-81-00-0A-47
ha=0X7F0XFF0X81000A47
ha=0X7F-FF0XF8-1000A47
o Booleans and switches
A boolean symbol performs a function just by its
presence. A switch is the value 0 or 1, and it
associates one of two functions to those values
(usually, disable and enable, respectively).
B.0.6 Modifying the Network Addresses File
The NETS. file describes the ranges of IP addresses
available to the server for the clients. Both BOOTP
and DHCP use this pool of addresses whenever dynamic IP
assignment is needed.
Separate entries in the NETS. file from one another by new
lines. The server ignores blank lines and comments (lines
beginning with the pound (#) symbol).
Each entry consists of three fields:
o The network number expressed as an IP address, for
example, 142.132.3.0.
o The owner of this IP address range expressed as the
IP address of the server host (142.132.3.1) or the
host name (dhcpserver in Example 4). If a DHCP cluster
failover environment is configured (see Section 7.5),
the IP address is defined as the null address 0.0.0.0 so
that applicable cluster nodes can receive packets.
o A range of available addresses for dynamic allocation to
hosts on the net.
The range is expressed as a pair of IP addresses with
a dash (-) between them, for example, 143.32.3.10-
143.32.3.30. There must be no white space separating
the dash from the IP addresses. You can specify more
Defining DHCP Client Information Manually B-9
Defining DHCP Client Information Manually
than one range for each network; the ranges need not be
contiguous.
The entries in the net file shown in Example B-5 describe
the IP ranges for two different networks, each with its own
set of IP addresses.
Example B-5 NETS Entries with IP Ranges for Two Networks
143.32.3.0 143.32.3.1 143.32.3.10-143.32.3.30
143.32.3.40-143.32.3.60 143.32.3.75-143.32.3.100
143.32.5.0 dhcpserver 143.32.5.10-143.32.5.200
The first entry comprises two lines and describes three
noncontiguous ranges of IP addresses for the network
143.32.3.0.
The second entry describes a single range of addresses for
the network 143.32.5.0. Notice the use of an IP address
in the first entry (143.32.3.1) and the use of a host name
(dhcpserver) in the second entry to describe the owner of
the IP address ranges.
B.0.7 Modifying the Netmask Masks File
If your network is subnetted in a format that is not
consistent with the standard A, B, or C netmask address,
you must include the network and netmask addresses
in the NETMASKS. file during the initial DHCP server
configuration. For more information, see Section 7.2.3.
B.0.8 Modifying the Namepool File
The NAMEPOOL. file specifies a collection of names
available for dynamic assignment to DHCP clients. The
server uses the names in this file only as a last resort.
For example, the server might use this file when the client
did not suggest a name and there is no name associated with
the IP address being offered to the client.
In addition to this pool of names, there is also a name
prefix. Once the name pool is exhausted, the server
generates names from the prefix by appending a number, 1,
2, 3, and a trailing "d." Once a name has been dynamically
bound to a host the server never uses the name again even
if that host subsequently acquires a new name.
B-10 Defining DHCP Client Information Manually
Defining DHCP Client Information Manually
Separate entries in the NAMEPOOL. file from one another by
new lines. The server ignores blank lines and comments
(lines beginning with a pound (#) symbol). Each entry
consists of four fields:
o The domain name to which the names apply.
o The owner of these names, expressed as the IP address
of the server host (142.132.3.1) or the host name
(dhcpserver).
o An optional name prefix, used for generating names once
the name pool is exhausted.
o A list of names in the pool.
Example B-6 shows a NAMEPOOL. file containing a name
prefix. The first entry describes five names available
to the acme.com domain with a name prefix of pc.
Example B-6 NAMEPOOL Entries Showing the Use of a Name
Prefix
acme.com 142.132.3.1 pc alpha bravo charlie delta echo engr.acme.com
dhcpserver EngrPC victor whiskey xray yankee zulu
The second entry describes five different names for the
engr.acme.com domain with a name prefix of EngrPC. Notice
the use of an IP address in the first entry (143.32.3.1)
and the use of a host name (dhcpserver) in the second entry
to describe the owner of the IP address ranges.
B.0.9 Reinitializing the DHCP Server
Once you have made changes to the configuration files, you
must force the server to read them again by sending it a
HUP signal (see Section 7.6). Enter the following commands:
$ dhcpsignal
$ dhcpsighup
Defining DHCP Client Information Manually B-11
Defining DHCP Client Information Manually
B.0.10 Using the DHCPDBDUMP, DHCPSHOWDBS, and DHCPDBSHOW
Utilities
The dhcpdbdump, dhcpshowdbs, and dhcpdbshow commands dump
the information stored in the lease database files. The
dumped lease information includes:
o MAC address
o MAC address type
o MAC address length (octets)
o IP address
o Start of lease (UCT)
o Lease expiration (UCT)
o Time when lease can be extended (UCT)
o Time when host last renewed or acquired this lease (UCT)
o IP address of server ``owning'' the lease
o Host name (without domain)
o Domain name
Each line of output describes the lease information for
one client. The output is in a format that is used by the
dhcpdbmod utility to modify the lease database.
________________________ Note ________________________
The dhcpbdump, dhcpshowdbs, and dhcpdbshow commands
perform read operations on the database, while
dhcpdbmod performs write operations.
______________________________________________________
The dhcpdbdump, dhcpshowdbs, and dhcpdbshow commands accept
a number of different flags and arguments. Table B-3 lists
some of the more important flags.
B-12 Defining DHCP Client Information Manually
Defining DHCP Client Information Manually
Table B-3 dhcpdbdump, dhcpshowdbs, and dhcpdbshow Command
__________Flags____________________________________________
Flag___Description_________________________________________
-a Dumps dates in readable format
-c Dumps currently active leases only
-e_____Dumps_expired_leases_only___________________________
B.0.11 Using the DHCPDBMOD Utility
The dhcpdbmod command modifies the lease and naming
information in the database files. It allows the user to
create, delete, or modify existing database entries and to
preassign static IP address to clients.
The utility takes input from a file that describes various
entries in the database. The syntax of each entry is
similar to the output of dhcpdbdump.
Use the following format:
o Terminate each record to be loaded by a new line.
o Delimit the fields within each record with the vertical
bar ( | ) character.
o Express date fields in one of the following ways:
- Universal Coordinated Time (UCT), the number of
seconds since 00:00 01/01/1970 GMT
- A format more easily understood, such Mon Jan 09 1995
10:00 or 01/09/1995 10:00:00
Although some fields can be empty, each entry consists of
the following fields:
1 MAC address
2 MAC address type
3 MAC address length (octets)
4 IP address
5 Start of lease (UCT)
6 Lease expiration (UCT)
7 Time when lease can be extended (UCT)
Defining DHCP Client Information Manually B-13
Defining DHCP Client Information Manually
8 Time when host last renewed or acquired this lease (UCT)
9 IP address of server ``owning'' the lease
10 Host name (without domain)
11 Domain name
Example B-7 shows a sample entry. The first entry describes
the client called alpha.acme.com with the IP address
143.32.3.20.
The second entry describes a Microsoft DHCP client with the
IP address 143.32.3.21. No name is given for this client.
Example B-7 Sample DHCPDBMOD Entry
00:a0:24:8c:6b:091|12|63|143.32.3.204|8449894575|8449894666|
8449894667|8449894668|143.32.3.19|alpha10|acme.com11|
01:00:40:05:14:df:11|0|7|143.32.3.21|844989457|844989466|844989466|
844989466|143.32.3.1|||
The dhcpdbmod command accepts a number of different flags
and arguments. Table B-4 shows some of the more important
flags.
Table_B-4_dhcpdbmod_Command_Flags__________________________
Flag___Description_________________________________________
-d Deletes the record.
-e Stores the record even if the lease has expired.
-l Stores the lease information only. Does not store
name information.
-n Stores the name information. Does not store lease
information.
-w_____Overwrites_the_record_if_a_record_already_exists.___
By default, dhcpdbmod stores both lease and name
information for non-expired and new clients.
B-14 Defining DHCP Client Information Manually
Defining DHCP Client Information Manually
B.0.12 Using the DHCPDBREG Utility
Use the dhcpdbreg command to populate the database with
the MAC address of known MAC clients. Set the SERVER.PCY
parameter, Restrict to Known MAC Address to True to use
this utility. The dhcpdbreg command can add or remove hosts
from the list of known MAC addresses. Use the following
syntax when you enter a record:
o Terminate each record to be loaded by a new line.
o Delimit the fields within each record with the pipe ( |
) character.
Each entry contains the following three fields:
o MAC address
o MAC address type
o MAC address length (octets)
The dhcpdbreg command accepts a number of different flags.
Two of the most important flags are as follows:
___________________________________________________________
Flags__Description_________________________________________
-d Deletes the record.
-s_____Displays_all_registered_MAC_addresses.______________
B.1 DHCP Configuration Symbols
Table B-5 describes each DHCP configuration file symbol and
indicates whether you use the symbol in DHCP configuration
only or in BOOTP and DHCP configuration.
Defining DHCP Client Information Manually B-15
Defining DHCP Client Information Manually
B.1 DHCP Configuration Symbols
Table_B-5_BOOTP/DHCP_Configuration_File_Symbols____________
Value
Symbol_Function______Format______Description_______________
ar Address IP address An IP address list value
range that defines the range
of addresses to be
dynamically assigned by
DHCPD. The list consists
of an even number of IP
addresses in pairs, each
identifying the beginning
and end of a range of
consecutive addresses. To
assign a single address,
use the ip symbol.
ba Broadcast IP address Specifies the broadcast
address address in use on the
client's subnet.
bf Boot file ASCII Specifies the fully
string qualified path name of
the client's default boot
image.
bs Boot file ASCII Specifies the length in
size integer or 512-octet blocks of the
auto default boot image for the
client.
cs Cookie IP address Specifies a list of
server t RFC 865 cookie servers
address available to the client.
list Enter servers in order of
preference.
ct ARP cache ASCII Specifies the timeout
timeout integer in seconds for ARP cache
entries.
B-16 Defining DHCP Client Information Manually
Defining DHCP Client Information Manually
B.1 DHCP Configuration Symbols
Table_B-5_(Cont.)_BOOTP/DHCP_Configuration_File_Symbols____
Value
Symbol_Function______Format______Description_______________
dd NetBIOS IP address Specifies a list of RFC
over TCP/IP list 1001/1002 NBDD servers
datagram listed in order of
distribution preference.
server
dg Maximum ASCII Specifies the maximum size
datagram integer datagram that the client
reassembly should be prepared to
size reassemble. The minimum
legal value is 576.
ee Ethernet en- 0 or 1 Specifies whether the
capsulation client should use Ethernet
Version 2 (RFC 894) or
IEEE 802.3 (RFC 1042)
encapsulation if the
interface is an Ethernet.
The switch values are 0 -
Use RFC 894 encapsulation
or 1 - Use RFC 1042
encapsulation.
ep Extensions ASCII Specifies a file,
path string retrievable through TFTP,
that contains information
that can be interpreted
in the same way as the 64-
octet vendor-extension
field in the BOOTP
response. The length of
the file is unconstrained.
gw Gateway IP address IP address list that
address list list specifies the IP address
of the gateway for the
specified subnet.
Defining DHCP Client Information Manually B-17
Defining DHCP Client Information Manually
B.1 DHCP Configuration Symbols
Table_B-5_(Cont.)_BOOTP/DHCP_Configuration_File_Symbols____
Value
Symbol_Function______Format______Description_______________
ha Clients ASCII Specifies if host names
hardware string can be assigned by the
address hardware address. If so
specified, the client
host, provided it remains
in the same domain,
retains the same name,
even if its IP address
changes.
hh Host name Boolean Can appear only in the
format hn: or hn@:.
Indicates that the DHCP
server should write the
client's host name to the
vend field of the DHCP
reply packet and send the
packet to the client.
ht Client's ASCII Specifies the hardware
hardware string type code as assigned in
type or ASCII the ARP section of RFC
integer 1340, Assigned Numbers.
if Forwarding 0 or 1 Specifies whether the
en- client should configure
able/disable its IP layer for packet
forwarding. The values are
0-Disable or 1-Enable.
im Impress IP address Specifies a list of
server list Imagen Impress servers
address available to the client.
list Enter servers in order of
preference.
ip Client IP IP address Specifies the IP address
address of the BOOTP client or
a single IP address to
assign the DHCP client.
B-18 Defining DHCP Client Information Manually
Defining DHCP Client Information Manually
B.1 DHCP Configuration Symbols
Table_B-5_(Cont.)_BOOTP/DHCP_Configuration_File_Symbols____
Value
Symbol_Function______Format______Description_______________
kg TCP 0 or 1 Specifies whether the
keepalive client should send TCP
garbage keepalive messages with
an octet of garbage for
compatibility with older
implementations.
ki TCP ASCII Specifies the interval
keepalive integer (in seconds) that the
interval client TCP should wait
before sending a keepalive
message on a TCP.
lg Log server IP address Specifies a list of
list MIT-LCS UDP log servers
available to the client.
lp LPR server IP address Specifies a list of RFC
address list list 1179 line printer servers
available to the client.
Enter servers in order of
preference.
lt Lease time ASCII Used in a client request
integer to allow the client to
request a lease time
for the IP address. In
a server reply, specifies
the lease time the server
is willing to offer.
Enter the time in months,
days, hours, minutes, and
seconds. For example,
2 months, 5 days, 45
seconds.
md Perform mask 0 or 1 Specifies whether the
discovery client should perform
subnet mask discovery
using ICMP.
Defining DHCP Client Information Manually B-19
Defining DHCP Client Information Manually
B.1 DHCP Configuration Symbols
Table_B-5_(Cont.)_BOOTP/DHCP_Configuration_File_Symbols____
Value
Symbol_Function______Format______Description_______________
mf Merit dump ASCII Specifies the path name
file string of a file to which the
client's core image
should be dumped in
the event the client
crashes. The path is
formatted as a character
string consisting of
characters from the NVT
ASCII character set.
mo Path MTU ASCII Specifies the timeout (in
aging integer seconds) to use when aging
timeout Path MTU values discovered
by the mechanism defined
in RFC 1191.
mp Path MTU ASCII Specifies a table of
plateau integer MTU sizes to use when
table list performing Path MTU
Discovery as defined in
RFC 1191. The minimum
value is 68.
ms Mask 0 or 1 A switch that specifies
supplier whether the client should
respond to subnet mask
requests using ICMP.
mt Interface ASCII Specifies the MTU to use
MTU integer on this interface.
na Nonanonymous Boolean Combine this symbol with
assignment the nc symbol to specify
that a nonanonymous
address assignment is
done from that network
class.
B-20 Defining DHCP Client Information Manually
Defining DHCP Client Information Manually
B.1 DHCP Configuration Symbols
Table_B-5_(Cont.)_BOOTP/DHCP_Configuration_File_Symbols____
Value
Symbol_Function______Format______Description_______________
nn NetBIOS over ASCII Specifies whether clients
TCP/IP node string can be configured as
type described in RFC 1001
and 1002. The NetBIOS node
type option allows NetBIOS
over TCP/IP configurable
clients to be configured
as described in RFC 1001
and 1002. Specify the
value as a single octet
(from 0 to 255) which
identifies the client
type.
ns IEN-116 IP address Specifies a list of
name server list IEN 116 name servers
address list available to the client.
Enter servers in order of
preference.
nt NTP servers IP address Specifies a list of NNTP
list (Network News Transfer
Protocol) Servers.
pf Policy IP address Specifies policy filters
filter list for nonlocal source
routing. The filters
consist of a list of IP
addresses and masks that
specify destination/mask
pairs with which to filter
incoming source routes.
rd Perform 0 or 1 Specifies whether the
Router client should solicit
Discovery routers using the Router
Discovery mechanism
defined in RFC 1256.
Defining DHCP Client Information Manually B-21
Defining DHCP Client Information Manually
B.1 DHCP Configuration Symbols
Table_B-5_(Cont.)_BOOTP/DHCP_Configuration_File_Symbols____
Value
Symbol_Function______Format______Description_______________
rl Resource IP address Specifies a list of RFC
Location list 887 Resource Location
Protocol servers available to the
server client. Servers should
address be listed in order of
list preference.
rp Root path ASCII Specifies the path
string name that contains the
client's root directory
or partition. The path is
formatted as a character
string consisting of
characters from the NVT
ASCII character set.
rs Router IP address Specifies the address
solicitation to which the client
address should transmit router
solicitation requests.
sa Boot server IP address Specifies the IP address
address of the TFTP server the
client uses.
sc NetBIOS over ASCII Specifies the NetBIOS
TCP/IP scope string over TCP/IP scope
text parameter for the
client as specified in
RFC 1001/1002. There
may be character-set
restrictions.
B-22 Defining DHCP Client Information Manually
Defining DHCP Client Information Manually
B.1 DHCP Configuration Symbols
Table_B-5_(Cont.)_BOOTP/DHCP_Configuration_File_Symbols____
Value
Symbol_Function______Format______Description_______________
sl All subnets 0 or 1 Specifies whether the
are local client can assume that
all subnets of the IP
network to which the
client is connected use
the same MTU as the subnet
of that network to which
the client is directly
connected.
sm Subnet mask IP address Specifies the client's
subnet mask as per RFC
950. A Subnet mask allows
the addition of subnetwork
numbers to an address
and provides more complex
address assignments. If
both the subnet mask and
the router option are
specified in a DHCP reply,
the subnet mask option
must be first.
sr Nonlocal 0 or 1 Specifies whether the
source client should configure
routing en- its IP layer to allow
able/disable forwarding of datagrams
with nonlocal source
routes.
Defining DHCP Client Information Manually B-23
Defining DHCP Client Information Manually
B.1 DHCP Configuration Symbols
Table_B-5_(Cont.)_BOOTP/DHCP_Configuration_File_Symbols____
Value
Symbol_Function______Format______Description_______________
st Static route IP address Specifies a list of
list static routes that the
client should install
in its routing cache.
If multiple routes to
the same destination
are specified, they are
listed in descending order
of priority. The routes
consist of a list of IP
address pairs. The first
address is the destination
address, and the second
address is the router for
the destination.
sw Swap server IP address Specifies the IP address
of the client's swap
server.
te Trailer en- 0 or 1 Specifies whether the
capsulation client should negotiate
the use of trailers (RFC
893) when using the ARP
protocol.
tl IP time-to- ASCII Specifies the default
live string time-to-live that the
client should use on
outgoing datagrams.
tn NetBIOS IP address Specifies a list of RFC
Datagram list 1001/1002 NBDD servers
Dist Servers listed in order of
preference.
to Time offset ASCII Specifies the offset of
integer or the client's subnet in
auto seconds from Coordinated
Universal Time (UTC).
B-24 Defining DHCP Client Information Manually
Defining DHCP Client Information Manually
B.1 DHCP Configuration Symbols
Table_B-5_(Cont.)_BOOTP/DHCP_Configuration_File_Symbols____
Value
Symbol_Function______Format______Description_______________
ts Time server IP address Specifies a list of RFC
address list list 868 time servers available
to the client. Servers
should be listed in order
of preference.
tt TCP default ASCII Specifies the default
TTL integer time-to-live that the
client should use when
sending TCP segments.
vm Vendor's ASCII Specifies a vendor magic
magic cookie string cookie for the client.
selector
xd X Windows IP address Specifies a list of X
System font list Window system font servers
server available to the client.
Enter addresses in order
of preference.
xf X Windows IP address Specifies a list of IP
System list addresses of systems that
display are running the X Window
manager system display manager
that are available to the
client. Enter addresses in
_________________________________order_of_preference.______
Defining DHCP Client Information Manually B-25
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