In message <bc5348$7rk$1@main.gmane.org>, you write: 

-> Victor Sudakov <sudakov@sibptus.tomsk.ru> wrote:
-> 
-> >>        subclass "allocation-class-2" 1:08:00:2b:a1:11:31 {
-> >>          option root-path "samsara:/var/diskless/alphapc";
-> >>          filename "/tftpboot/netbsd.alphapc-diskless";
-> >>        }
-> > 
-> > Yes, option root-path is indeed option 17.
-> > Unfortunately ofwboot.net does not parse the option string as you expect.
-> 
-> My reading of sys/lib/libsa/bootp.c is that 'rootip' is inite from
-> option 16 (swap-server, doh!) if supplied.  root path (options 17)
-> should be just the pathname.

ISC's dhcpd has a 'next-server', here's what all my netboot-capable
entries look like:

host blah {
  option host-name "blah";
  hardware ethernet xx:xx:xx:xx:xx:xx;
  fixed-address 1.2.3.4;
  server-name "root-server:/roots/myroot";
  next-server root-server;
}

I'm not sure if I really need the "root-server:" in the server-name field, 
but it works, so I haven't mucked with it.  Most of my netbooting boxes
are sgimips machines, but I'm pretty sure the same type of syntax has 
worked for my Ultra5 and Shark as well.

--rafal

----
Rafal Boni                                                     rafal@attbi.com
  We are all worms.  But I do believe I am a glowworm.  -- Winston Churchill