$Id$ 

The dhcpd server recognizes the pxe clients and supplies them
with the boot image filename to fetch via tftp.  It also tells
the clients the location of the root filesystem, which is used to
grab the kernel.  The following specifies this in dhcpd.ex0:

    class "pxe-clients-ia32" {
            match if substring (option vendor-class-identifier, 0, 20)
                     = "PXEClient:Arch:00000";
            filename "pxeboot_ia32_com0.bin";
    }
    option root-path "/exports/cuwpxe/root";

Note that the -current version of the pxeboot image is broken as
of Thu May 6, 2004.  The version we are using was pulled out of
the stable binary/sets/base.tgz.  This file is placed at
/tftpboot/.  The tftp deamon is run by the inetd superserver.

nfsd/mountd are also required.  /etc/exports looks like:

    /exports/cuwpxe/root -maproot=root:wheel    -network 192.168.29
    /exports/cuwpxe/swap -maproot=root:wheel    -network 192.168.29

The root filesystem for the PXE boot was created by unpacking a
staboot.tgz and replacing the etc/fstab with:

    192.168.29.1:/export/cuwpxe/root  /    nfs  rw 0 0
    192.168.29.1:/export/cuwpxe/swap   none  swap  sw,nfsmntpt=/swap

and placing rc_configured=NO in /etc/rc.conf in order to
have it drop straight to single-user.

PXE booting a node into multiuser mode so that it can be flashed 
without console access remains TDB.

$Id$