NAME
nfsd - remote NFS server daemon

SYNOPSIS
nfsd [ -u msk,mtch,numprocs ] [ -t msk,mtch,hostadr1,hostadr2,... ]
[ numprocs ]

DESCRIPTION
Nfsd runs on a server machine to service NFS requests from client
machines. At least one nfsd must be running for a machine to
operate as a server. The options -u and -t are used to indicate
which transport protocols are to be served.

-u Serve UDP NFS clients.

-t Serve TCP NFS clients.

msk, mtch
These arguments permit restriction of NFS services to a subset
of the host addresses. The msk and mtch are applied to the
client host address as follows:

if (( host_address & msk ) == mtch )
- service the client request
else
- drop the request

hostadr1,...
You may also specify zero or more specific host addresses to
be accepted as well as ones that pass the msk, mtch test
above. This may only be done for transport protocols that are
connection based, such as TCP. For the internet domain, msk,
mtch and hostadrs’ are specified in internet dot notation.

numprocs
Specifies how many servers to fork off. This may only be
specified for non-connection based protocols such as UDP.

If neither -u or -t are specified, numprocs servers for UDP
accepting requests from all clients are started. If numprocs is
not specified, it defaults to 1.

For example:

nfsd -u 255.255.255.0,131.104.48.0,4 -t 255.255.0.0,131.104.0.0,
131.102.31.2

- Serves UDP and TCP transports. For UDP, it runs 4 daemons that
accept requests from any client on subnet 131.104.48. For
TCP, it accepts connections from any client on network 131.104
plus the client with the address 131.102.31.2.

nfsd -u 255.255.240.0,131.104.0.0,6 -t 0,0

- Serves UDP and TCP transports. For UDP, it runs 6 daemons
that accept requests from clients with addresses in the range
131.104.0.x - 131.104.15.x. For TCP, it accepts connections
from any client.

nfsd -u 0,0,4

- Serves any UDP client with 4 servers, only.

nfsd 4

- Serves any UDP client with 4 servers, only. (Compatibility)

A server should typically run enough daemons to handle the maximum
level of concurrency from its clients, typically four to six.

Nfsd listens for service requests at the port indicated in the NFS
server specification; see "Network File System Protocol
Specification, RFC1094"

SEE ALSO
nfsstat(1), nfssvc(2), mountd(8), portmap(8)

BUGS
The client host address restrictions specified here are unrelated
to the mount restrictions specified in /etc/exports for mountd(8).