alpha netboot documentation addendum

I've just updated an old AlphaStation 400 to 5.2
and found out that following INSTALL.alpha step by
step, I couldn't netboot it, it will always give
this error: "No response for RARP request" then
I googled a bit, and found that I'd also had
to put the MAC address of the workstation in
the /etc/ethers file, followed by it's hostname
and then I had to start not only dhcpd and
rpc.bootparamd, but also rarpd
then it worked like a charm :)