# man > rdisc6(8)

[_RDISC6_(8)](https://www.chedong.com/phpMan.php/man/RDISC6/8/markdown)                              System Manager's Manual                             [_RDISC6_(8)](https://www.chedong.com/phpMan.php/man/RDISC6/8/markdown)

## NAME
       rdisc - ICMPv6 Router Discovery tool

## SYNOPSIS
       **rdisc6 **[**-qv**] [**-r attempts**] [**-s source_ip**] [**-w wait_ms**] [**IPv6 address**] <**iface**>


## DESCRIPTON
       **RDisc6  **is  an  Unix  program which implements the ICMPv6 Router Discovery in userland (it is
       normally done by the kernel). It is used to lookup the list of on-link routers and IPv6  pre‐
       fixes.

       It  can  also  be used to force the kernel to update the state of a given IPv6-autoconfigured
       network interface.

       The name of the network interface to probe routers for must be specified.


## OPTIONS
### -1  --single
              Exit as soon as the first advertisement is received.


### -h  --help
              Display some help and exit.


### -m  --multiple
              Wait for possible multiple advertisements and print all of them (default).


### -n  --numeric
              If the optional parameter is not a valid IPv6 address, do not try to resolve it  as  a
              DNS hostname.


### -q  --quiet
              Only  display  advertised  IPv6 prefixes. Display nothing in case of failure.  That is
              mostly useful when calling the program from a shell script.


### -r attempts  --retry attempts
              Send ICMPv6 Router Discovery that many times until a reply is received, or  abort.  By
              default, rdisc6 will try 3 times before aborting (MAX_RTR_SOLICITATIONS from RFC2461).


### -s source_ip  --source source_ip
              Specify the IPv6 address to be used as the source for the router solicitation packets.


### -V  --version
              Display program version and license and exit.


### -v  --verbose
              Display verbose information. That is the default.


### -w wait_ms  --wait wait_ms
              Wait  _wait_ms_ milliseconds for a response before retrying.  By default, rdisc6 waits 4
              second between each attempts (RTR_SOLICITATION_INTERVAL from RFC2461).


       If **rdisc6 **does not receive any response after the specified number of  attempts  waiting  for
       _wait_ms_  milliseconds  each  time,  it will exit with code 2. On error, it exits with code 1.
       Otherwise it exits with code 0.


## SECURITY
       **rdisc6 **must be _setuid_ _root_ to allow use by non privileged users. It will drop its root privi‐
       leges before any attempt is made to send or receive data from the network to reduce the  pos‐
       sible impact of a security vulnerability.


## SEE ALSO
       [ndisc6(8)](https://www.chedong.com/phpMan.php/man/ndisc6/8/markdown), [ipv6(7)](https://www.chedong.com/phpMan.php/man/ipv6/7/markdown)


## AUTHOR
       Rémi Denis-Courmont <remi at remlab dot net>

       <http://www.remlab.net/ndisc6/>

rdisc6                                         $Date$                                      [_RDISC6_(8)](https://www.chedong.com/phpMan.php/man/RDISC6/8/markdown)