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ndd(8)
System Administration Commands ndd(8)
NAME
ndd - get and set driver configuration parameters
SYNOPSIS
ndd [-set] driver parameter [value]
DESCRIPTION
ndd gets and sets selected configuration parameters in some kernel
drivers. Currently, ndd only supports the drivers that implement the
TCP/IP Internet protocol family. Each driver chooses which parameters
to make visible using ndd. Since these parameters are usually tightly
coupled to the implementation, they are likely to change from release
to release. Some parameters may be read-only.
Note -
It is strongly encouraged that you use ipadm(8), rather than ndd, to
modify or retrieve TCP/IP Internet protocols. The current ndd command
will be made obsolete in a future release, replaced by ipadm(8).
Please see NOTES for more information.
If the ndd -set option is omitted, ndd queries the named driver,
retrieves the value associated with the specified parameter, and prints
it. If the -set option is given, ndd passes value, which must be speci‐
fied, down to the named driver which assigns it to the named parameter.
By convention, drivers that support ndd also support a special read-
only parameter named "?" which can be used to list the parameters sup‐
ported by the driver.
EXAMPLES
Example 1 Getting Parameters Supported By The TCP Driver
To see which parameters are supported by the TCP driver, use the fol‐
lowing command:
example% ndd /dev/tcp \?
The parameter name "?" may need to be escaped with a backslash to pre‐
vent its being interpreted as a shell meta character.
The following command sets the value of the parameter ip_forwarding in
the dual stack IP driver to zero. This disables IPv4 packet forwarding.
example% ndd -set /dev/ip ip_forwarding 0
Similarly, in order to disable IPv6 packet forwarding, the value of
parameter ip6_forwarding
example% ndd -set /dev/ip ip6_forwarding 0
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Availabilitysystem/core-os
SEE ALSO
ioctl(2), arp(4P), ip(4P), ip6(4P), tcp(4P), udp(4P), attributes(7),
dladm(8), ipadm(8)
NOTES
The parameters supported by each driver may change from release to
release. Like programs that read /dev/kmem, user programs or shell
scripts that execute ndd should be prepared for parameter names to
change.
The ioctl() command that ndd uses to communicate with drivers is likely
to change in a future release. User programs should avoid making depen‐
dencies on it.
The use of ndd to administer Layer 2 (Data Link layer) drivers is
strongly discouraged as this capability is to be obsoleted in a future
release, replaced by dladm(8). Please refer to the driver-specific man
page in section 4D of the Oracle Solaris man pages.
The use of ndd to administer the drivers that implement the TCP/IP
Internet protocol family (IP/TCP/SCTP/UDP/ICMP) is strongly discouraged
as this capability is to be obsoleted in a future release, replaced by
ipadm. Please see ipadm(8) for instructions for modifying and retriev‐
ing supported protocol properties.
The meanings of many ndd parameters make sense only if you understand
how the driver is implemented.
Oracle Solaris 11.4 31 Jan 2018 ndd(8)