HP-UX Reference (11i v3 07/02) - 1M System Administration Commands N-Z (vol 4)

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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 net-

working operation and behavior. It accepts arguments on the command line or may be run interactively.

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

ndd provides in the fol-

lowing categories: ARP, IP, IPSEC, IPV6, IPV6 Neighbor Discovery (ND), RAWIP, RAWIP6, SOCKET,

TCP, and UDP.

The tunable parameters in each category may be accessed with the proper valid network_device name. The

network_device name is referred to as

TRANSPORT_NAME[] in /etc/rc.config.d/nddconf

The valid network_device names (and their associated parameter categories) are:

/dev/arp (ARP),

/dev/ip (IP and IPSEC),

/dev/ip6 (IPV6, IPV6 Neighbor Discovery, and IPSEC v6),

/dev/rawip (RAWIP),

/dev/rawip6 (RAWIP6),

/dev/sockets (SOCKET),

/dev/tcp (TCP), and

/dev/udp (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; for example, 240000 for 4 minutes. Unless

stated otherwise, numbers are assumed to be in decimal. Use "0x" preﬁx to specify

hexadecimal values.

In general, all tunable parameters are global; in other words, 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 sup-

ported 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.

HP-UX 11i Version 3: February 2007 − 1 − Hewlett-Packard Company 35