Content-type: text/html Man page of jdbdump

jdbdump

Section: Maintenance Commands (8)
Index Return to Main Contents
 

NAME

jdbdump - Dumps fields from the DHCP dynamic databases.  

SYNOPSIS

/usr/sbin/jdbdump [-a] [-c] [-e] [-f character] [-k key]
     [-s date] tag...  

OPTIONS

Dumps dates in a readable form. The default is to dump all date-time fields as UCT (seconds since GMT 1/1/70 00:00). Display currently active leases only. Display expired leases only. Uses character as the field separator. The default is the pipe (|) character. Requests that a specific record with the given key be dumped. The key has three fields: the client's hardware type, hardware address, and IP address of its subnet. These three components should be separated by whitespace and enclosed within quotes (otherwise the shell will create multiple words). Dumps records timestamped since date. The default is to dump all the records regardless of the date of last modification.  

DESCRIPTION

The jdbdump command reads the databases used by the joind daemon to store information on client IP address leases and dynamic names and prints selected fields. Each record is terminated by a newline, and the fields within each record delimited by default with the pipe (|) character, although this may be changed with the -f command line option. Date fields are displayed in Universal Coordinated Time (UCT), seconds since 00:00 01/01/1970 GMT, unless the -a flag is given, which alters the format to a more readable form.

The following fields are always dumped: This is the identifier which uniquely identifies the client. It may be the client's MAC address or an opaque object, uninterpreted by the JOIN software. If nonzero, then the client id is the MAC address of the client corresponding to this type. If zero, then the client id may be any byte array which serves to uniquely identify the client. The length of the identifier in 8-bit bytes. Note that if the client id corresponds to a MAC address then this field is redundant. But in the more general case, it may be needed in order to determine whether the client id is to be interpreted as a literal or as a decimal or hexadecimal encoding of a byte string. Resolving this ambiguity becomes important when a file produced by jdbdump has to be reloaded into the database by jdbmod. The IP address assigned to the client. If this value is null or 0.0.0.0 it means "none". The presence of this value does not necessarily mean that the client is actually at this address. Even when the lease is unexpired, clients may hold valid leases on addresses for more than one network. If the client has assignments on n different networks, then jdbdump will generally dump n different records for that one client. The time at which this lease began. The time at which this lease will expire. The time at which this lease may be renewed. Requests to renew the lease prior to this will be answered by a reply determined by the residual time remaining on the lease until expiration. After this time has passed, the client will receive an entirely new lease whose duration is determined by the bootptab database. Time when client last acquired or renewed this lease. IP address of server "owning" the lease. The client's name (without the domain name). The client's domain (without the leaf name). If a client's fully qualified domain name were a.b.c.d, the hostname field would contain a and the domain field would contain b.c.d. These fields are any fields given by the command line tag arguments. These tags identify DHCP configuration parameters. They may be numeric, a two character symbol, or the parameter's long name. See RFC2132 for the numerical values or see bootptab(4) for the symbolic or long names. Note that the values dumped are those that the client would have were it to occupy this IP address. It does not necessarily mean that the client is presently operating with those values.

Following these fields are any fields given by the command line "tag" arguments. These tags identify DHCP configuration parameters. They may be numeric, a two character symbol, or the parameter's long name. Consult RFC1533 for the numerical values or see bootptab(4) for the symbolic or long names.  

FILES

 

RELATED INFORMATION

Commands: jdbmod(8), joind(8)

Files: bootptab(4) delim off


 

Index

NAME
SYNOPSIS
OPTIONS
DESCRIPTION
FILES
RELATED INFORMATION

This document was created by man2html, using the manual pages.
Time: 02:40:35 GMT, October 02, 2010