ndd

 

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 Maintenance Commands                                      ndd(1M)
 
 
 


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.
 
      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  spe-
      cial  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 following 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 dis-
      ables 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:
 
 
 
 
 
 SunOS 5.8            Last change: 8 Nov 1999                    1
 
 
 
 
 
 
 Maintenance Commands                                      ndd(1M)
 
 
 
      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  attri-
      butes:
 
      ____________________________________________________________
     |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
     |_____________________________|_____________________________|
     | Availability                | SUNWcsu                     |
     |_____________________________|_____________________________|
 
 


SEE ALSO
      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 pro-
      grams should avoid making dependencies on it.
 
      The meanings of many ndd parameters make sense only  if  you
      understand how the driver is implemented.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 SunOS 5.8            Last change: 8 Nov 1999                    2
 
 
 

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