HP-UX Reference (11i v2 04/09) - 1M System Administration Commands N-Z (vol 4)

ManualsBrandsHP ManualsSoftwareHP-UX Reference Manuals

ndd(1M) ndd(1M)

NAME

ndd - network tuning

SYNOPSIS

ndd -get network_device parameter

ndd -set network_device parameter value

ndd -h sup[ported]

ndd -h unsup[ported]

ndd -h [parameter ]

ndd -c

DESCRIPTION

The ndd command allows the examination and modiﬁcation of several tunable parameters that affect

networking operation and behavior. It accepts arguments on the command line or may be run interac-

tively. The -h option displays all the supported and unsupported tunable parameters that

ndd provides.

Valid network_device names are:

/dev/arp, /dev/ip

, /dev/rawip, /dev/tcp, and /dev/udp.

Set parameter to

? to get a list of parameters for a particular network_device.

ndd -get Get the value of the parameter for network_device and print the value to standard

output. Returned numbers are always displayed as decimal strings.

ndd -set Set parameter for network_device to value .

All times are speciﬁed in milliseconds, e.g. 240000 for 4 minutes. Unless stated oth-

erwise, numbers are assumed to be in decimal. Use "0x" preﬁx to specify hexade-

cimal values.

In general, all tunable parameters are global, i.e., they affect all instances of the

network module. Some settings take effect immediately, while others are used to

initialize data for an instance and will only affect newly opened streams.

ndd -h supported

Display all the supported tunable parameters. This set of parameters are supported

by HP and detailed descriptions of these tunable parameters are available through

the -h parameter command.

ndd -h unsupported

Display all the unsupported tunable parameters. This set of parameters are not

supported by HP and modiﬁcation of these tunable parameters are not suggested

nor recommended. Setting any unsupported tunable parameters on your system

may result in adverse effects to your networking operations.

ndd -h When parameter is speciﬁed, a detail description of the parameter, along with its

minimum, maximum, and default value are displayed. If no parameter is speciﬁed,

it displays all supported and unsupported tunable parameters.

ndd -c Read input from the conﬁguration ﬁle /etc/rc.config.d/nddconf

and set

the tunable parameters. A user may specify tunable parameters in the nddconf

conﬁguration ﬁle, and these parameters will be set automatically each time the sys-

tem boots.

DIAGNOSTICS

When the command fails, an error message is printed to the standard error and the command terminates

with an exit value of one.

WARNINGS

Care must be used when setting parameters for a network_device. Setting a tunable parameter to an

inappropriate value can result in adverse affects to your networking operations.

EXAMPLES

To get help information on all supported tunable parameters:

ndd -h supported

To get a detail description of the tunable parameter, ip_forwarding:

ndd -h ip_forwarding

HP-UX 11i Version 2: September 2004 − 1 − Hewlett-Packard Company Section 1M−−507