/ and /usr filesystems
diskless:\
        :ht=ether:\
        :ha=0000c01f848a:\
        :sm=255.255.255.0:\
        :hn:\
        :ds=192.1.2.3:\
        :ip=192.1.2.4:\
        :gw=192.1.2.5:\
        :vm=rfc1048:
cfg.X.X.X.X (or
/tftpboot/cfg.X.X.X.X, it will try both)
where X.X.X.X is the IP address of the
client.  The contents of this file can be any valid
netboot commands.  Under 2.0, netboot has the
following commands:
help			- print help list
ip <X.X.X.X>		- print/set client's IP address
server <X.X.X.X>	- print/set bootp/tftp server address
netmask <X.X.X.X>	- print/set netmask
hostname <name>		- print/set hostname
kernel <name>		- print/set kernel name
rootfs <ip:/fs>		- print/set root filesystem
swapfs <ip:/fs>		- print/set swap filesystem
swapsize <size>		- set diskless swapsize in Kbytes
diskboot		- boot from disk
autoboot		- continue boot process
trans <on|off>		- turn transceiver on|off
flags [bcdhsv]		- set boot flags
rootfs 192.1.2.3:/rootfs/myclient
swapfs 192.1.2.3:/swapfs
swapsize 20000
hostname myclient.mydomain
rootfs 192.1.2.3:/rootfs/myclient
hostname myclient.mydomain
/etc/exports file on FreeBSD might
look like:
/rootfs/myclient -maproot=0:0 myclient.mydomain
/swapfs -maproot=0:0 myclient.mydomain
/rootfs/myclient -root=myclient.mydomain
/swapfs -root=myclient.mydomain
dd.  If your swapfs command has the
arguments /swapfs and the size 20000 as in the
example above, the swapfile for myclient will be called
/swapfs/swap.X.X.X.X where X.X.X.X
is the client's IP addr, eg:   
# dd if=/dev/zero of=/swapfs/swap.192.1.2.4 bs=1k count=20000
# chmod 0600 /swapfs/swap.192.1.2.4
/rootfs/myclient in the example above).
/dev in
/rootfs/myclient, beware that some
systems (HPUX) will not create device files that
FreeBSD is happy with.  You may have to go to
single user mode on the first bootup (press
control-c during the bootup phase), cd
/dev and do a "sh ./MAKEDEV
all" from the client to fix this.netboot.com on the client or make an EPROM
from the netboot.rom file/ and /usr filesystems