- NetBSD Manual Pages
RPCBIND(8) NetBSD System Manager's Manual RPCBIND(8)
Powered by man-cgi (2021-06-01).
Maintained for NetBSD
by Kimmo Suominen.
Based on man-cgi by Panagiotis Christias.
rpcbind -- universal addresses to RPC program number mapper
rpcbind [-6adiLlsWw] [-h bindip]
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 address where RPC
requests should be sent.
The rpcbind utility should be started before any other RPC service. Nor-
mally, standard RPC servers are started by port monitors, so rpcbind must
be started before port monitors are invoked.
When rpcbind is started, it checks that certain name-to-address transla-
tion-calls function correctly. If they fail, the network configuration
databases may be corrupt. Since RPC services cannot function correctly
in this situation, rpcbind reports the condition and terminates.
The rpcbind utility can only be started by the super-user.
Access control is provided by /etc/hosts.allow and /etc/hosts.deny, as
described in hosts_access(5) with daemon name rpcbind.
-6 Bind to AF_INET6 (IPv6) addresses only.
-a When debugging (-d), abort on errors.
-d Run in debug mode. In this mode, rpcbind will not fork when it
starts, will print additional information during operation, 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.
IP addresses to bind to when servicing TCP and UDP requests.
This option may be specified multiple times and is typically nec-
essary when running on a multi-homed host. 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 specifying IP addresses with -h, rpcbind will automati-
cally add 127.0.0.1 and if IPv6 is enabled, ::1 to the list.
-i ``Insecure'' mode. Allows calls to SET and UNSET from any host.
Normally rpcbind accepts 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 inter-
-L Allows old-style local connections over the loopback interface.
Without this flag, local connections are only allowed over a
local socket, /var/run/rpcbind.sock.
-l Turns on libwrap connection logging.
-s Causes rpcbind to change to the user daemon as soon as possible.
This causes rpcbind to use non-privileged ports for outgoing con-
nections, preventing non-privileged clients from using rpcbind to
connect to services from a privileged port.
-W Enable libwrap (TCP wrappers) support.
-w Enable the warmstart feature.
The warmstart feature saves RPC registrations on termination.
Any saved RPC registrations are restored on restart if -w is
specified. This feature helps avoid RPC service interruption
when restarting rpcbind. warmstart support must be compiled in
to rpcbind. Portmap registrations are stored in
/tmp/portmap.file. rpcbind registrations are stored in
All RPC servers must be restarted if rpcbind is restarted.
/var/run/portmap.file saved portmap registrations file.
/var/run/rpcbind.file saved rpcbind registrations file.
/etc/hosts.allow explicit remote host access list.
/etc/hosts.deny explicit remote host denial of service list.
rpcbind(3), hosts_access(5), hosts_options(5), netconfig(5), rpcinfo(8)
NetBSD 9.3 August 17, 2017 NetBSD 9.3