ndd(1M) System Administration Commands ndd(1M)NAMEndd - get and set driver configuration parameters
SYNOPSISndd [-set] driver parameter [value]
DESCRIPTIONndd 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.
If the -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 specified,
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
supported 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
prevent 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
To view the current IPv4 forwarding table, use the following command:
example% ndd /dev/ip ipv4_ire_status
To view the current IPv6 forwarding table, use the following command:
example% ndd /dev/ip ipv6_ire_status
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Availability │SUNWcsu │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOnca(1), ioctl(2), attributes(5), arp(7P), ip(7P), ip6(7P), tcp(7P),
udp(7P)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 meanings of many ndd parameters make sense only if you understand
how the driver is implemented.
SunOS 5.10 8 Nov 1999 ndd(1M)
