154 lines
4.7 KiB
Groff
154 lines
4.7 KiB
Groff
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.\" <<Id: ndbootd.8,v 1.2 2001/05/15 14:42:25 fredette Exp >>
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.\"
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.\" Copyright (c) 2001 Matthew Fredette. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Matthew Fredette.
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.\" 4. The name of Matthew Fredette may not be used to endorse or promote
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.\" products derived from this software without specific prior written
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.\" permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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.Dd May 9, 2001
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.Dt NDBOOTD 8
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.Os
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.Sh NAME
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.Nm ndbootd
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.Nd
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.Tn Sun
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Network Disk (ND) Protocol server
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.Sh SYNOPSIS
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.Nm
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.Op Fl s Ar boot2
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.Op Fl i Ar interface
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.Op Fl w Ar windowsize
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.Op Fl d
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.Ar boot1
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.Sh DESCRIPTION
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.Nm
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is a server which supports the
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Sun Network Disk (ND) Protocol.
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This protocol was designed by Sun before they designed
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.Tn NFS .
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ND simply
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makes the raw blocks of a disk available to network clients. Contrast
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this with the true namespace and file abstractions that
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.Tn NFS
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provides.
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.Pp
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The only reason you're likely to encounter ND nowadays is if you have
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an old Sun 2 machine, like the 2/120 or 2/50. The Sun 2 PROMs can
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only use ND to boot over the network. (Later, the Sun 3 PROMs would
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use
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.Tn RARP
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and
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.Tn TFTP
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to boot over the network.)
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.Pp
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.Nm
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is a very simple ND server that only supports client reads for
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booting. It exports a disk that the clients consider to be
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.Pa /dev/ndp0
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(ND public unit zero). The disk is available only to clients that are
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listed in
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.Pa /etc/ethers
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and have valid hostnames.
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(Sun 2 PROMs don't do RARP, but they do learn their IP
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address from the first ND response they receive from the server.)
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.Pp
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.Ar boot1
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is a file containing the mandatory first-stage network boot
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program, typically
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.Pa /usr/mdec/bootyy .
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The layout of the exported disk is:
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.Bl -bullet -offset indent
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.It
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block 0: normally a Sun disklabel (but ignored by the PROM)
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.It
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blocks 1-15: the first-stage network boot program
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.El
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.Pp
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With the
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.Fl s Ar boot2
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option,
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.Nm
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will also make a second-stage network
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boot program available to clients, typically
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.Pa /usr/mdec/netboot .
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When
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.Ar boot2
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is a filename, that file is the single second-stage network boot program
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to be served to all clients.
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.Pp
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When
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.Ar boot2
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is a directory name, typically
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.Pa /tftpboot ,
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.Nm
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finds a
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client's second-stage network boot program by turning its IP address
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into a filename in that directory, in the same manner later Sun 3
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PROMs do when TFTPing (i.e., if a client has IP address 192.168.1.10,
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.Nm
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expects to find
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.Pa /tftpboot/C0A8010A.SUN2
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).
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.Pp
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When used in this last manner with an ND-aware first-stage boot program,
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.Nm
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serves the same purpose in the Sun 2 netboot process as
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.Xr tftpd 8
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serves in the Sun 3 netboot process.
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.Pp
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Any second-stage network boot program always begins at block 16 of the
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exported disk, regardless of the length of the first-stage network
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boot program.
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.Pp
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All first- and second-stage network boot programs must have all
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executable headers stripped off; they must be raw binary programs.
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.Pp
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The remaining options are:
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.Bl -tag -width "directory"
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.It Fl i Ar interface
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Only listen for ND clients on interface
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.Ar interface .
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Normally
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.Nm
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listens for clients on the first non-loopback IP interface
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that is up and running.
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.It Fl w Ar windowsize
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This adjusts the window size of the ND protocol. This is
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the number of 1-kilobyte packets that can be transmitted before
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waiting for an acknowledgement. Defaults to 6.
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.It Fl d
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Run in debug mode. Debugging output goes to standard error
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and the server will not fork.
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.El
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.Pp
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.Sh FILES
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.Bl -tag -width Pa -compact
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.It Pa /etc/ethers
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.It Pa /etc/hosts
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.\" .It Pa /tftpboot
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.El
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.Sh SEE ALSO
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.Xr tftpd 8
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.Sh BUGS
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Whether or not there is a second-stage network boot program, the
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exported disk appears to all clients to have infinite length. The
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content of all blocks not used by the first- or second-stage network
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boot programs is undefined. All client reads of undefined blocks
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are silently allowed by the server.
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