# man > rpcbind(8)

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

## NAME
       rpcbind — universal addresses to RPC program number mapper

## SYNOPSIS
       **rpcbind **[**-adhiLlsr**]

## DESCRIPTION
       The  **rpcbind  **utility is a server that converts RPC program numbers into universal addresses.
       It must be running on the host to be able to make RPC calls on a server on that machine.

       When an RPC service is started, it tells **rpcbind **the address at which it  is  listening,  and
       the RPC program numbers it is prepared to serve.  When a client wishes to make an RPC call to
       a  given program number, it first contacts **rpcbind **on the server machine to determine the ad‐
       dress where RPC requests should be sent.

       The **rpcbind **utility should be started before any other RPC service.  Normally,  standard  RPC
       servers are started by port monitors, so **rpcbind **must be started before port monitors are in‐
       voked.

       When  **rpcbind  **is  started, it checks that certain name-to-address translation-calls function
       correctly.  If they fail, the network configuration databases may be corrupt.  Since RPC ser‐
       vices cannot function correctly in this situation, **rpcbind **reports the condition  and  termi‐
       nates.

       The **rpcbind **utility can only be started by the super-user.

## OPTIONS
### -a       -d

### -d      
               eration, and will abort on certain errors if **-a **is also specified.  With this option,
               the name-to-address translation consistency checks are shown in detail.

### -f      

### -h      
               fied multiple times and can be used to restrict the interfaces rpcbind  will  respond
               to.   When  specifying IP addresses with **-h**, **rpcbind **will automatically add **127.0.0.1**
               and if IPv6 is enabled, **::1 **to the list.  If no **-h **option is specified, **rpcbind  **will
               bind to INADDR_ANY, which could lead to problems on a multi-homed host due to **rpcbind**
               returning  a  UDP  packet from a different IP address than it was sent to.  Note that
               when **rpcbind **is controlled via systemd's socket activation, the **-h **option is ignored.
               In this case, you need to  edit  the  **ListenStream  **and  **ListenDgram  **definitions  in
               **/usr/lib/systemd/system/rpcbind.socket **instead.

### -i      
               cepts these requests only from the loopback interface  for  security  reasons.   This
               change  is necessary for programs that were compiled with earlier versions of the rpc
               library and do not make those requests using the loopback interface.

### -l      

### -s      
               to  use  non-privileged  ports  for  outgoing  connections, preventing non-privileged
               clients from using **rpcbind **to connect to services from a privileged port.

### -w      
               state file is created when **rpcbind **terminates.

### -r      
               rpcinfo need this feature turned on for work properly. (This flag is a Debian  exten‐
               sion.)

## FILES
       If  "/etc/default/rpcbind"  exists,  rpcbind  will  use  the specified options at launch time
       **rpcbind **Otherwise rpcbind will try to load configuration  from  "/etc/rppcbind.conf"  **rpcbind**
       The default options are set as "-w -f".

## NOTES
       All RPC servers must be restarted if **rpcbind **is restarted.

## SEE ALSO
       [_rpcinfo_(8)](https://www.chedong.com/phpMan.php/man/rpcinfo/8/markdown)

## LINUX PORT
       Aurelien Charbon <<aurelien.charbon@bull.net>>

Debian                                   September 14, 1992                               [_RPCBIND_(8)](https://www.chedong.com/phpMan.php/man/RPCBIND/8/markdown)