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NDBOOTD(8) BSD System Manager's Manual NDBOOTD(8) NAME
ndbootd -- Sun Network Disk (ND) Protocol server SYNOPSIS
ndbootd [-s boot2] [-i interface] [-w windowsize] [-d] boot1 DESCRIPTION
ndbootd is a server which supports the Sun Network Disk (ND) Protocol. This protocol was designed by Sun before they designed NFS. ND sim- ply makes the raw blocks of a disk available to network clients. Contrast this with the true namespace and file abstractions that NFS pro- vides. The only reason you're likely to encounter ND nowadays is if you have an old Sun 2 machine, like the 2/120 or 2/50. The Sun 2 PROMs can only use ND to boot over the network. (Later, the Sun 3 PROMs would use RARP and TFTP to boot over the network.) ndbootd is a very simple ND server that only supports client reads for booting. It exports a disk that the clients consider to be /dev/ndp0 (ND public unit zero). The disk is available only to clients that are listed in /etc/ethers and have valid hostnames. (Sun 2 PROMs don't do RARP, but they do learn their IP address from the first ND response they receive from the server.) boot1 is a file containing the mandatory first-stage network boot program, typically /usr/mdec/bootyy. The layout of the exported disk is: o block 0: normally a Sun disklabel (but ignored by the PROM) o blocks 1-15: the first-stage network boot program With the -s boot2 option, ndbootd will also make a second-stage network boot program available to clients, typically /usr/mdec/netboot. When boot2 is a filename, that file is the single second-stage network boot program to be served to all clients. When boot2 is a directory name, typically /tftpboot, ndbootd finds a client's second-stage network boot program by turning its IP address into a filename in that directory, in the same manner later Sun 3 PROMs do when TFTPing (i.e., if a client has IP address 192.168.1.10, ndbootd expects to find /tftpboot/C0A8010A.SUN2 ). When used in this last manner with an ND-aware first-stage boot program, ndbootd serves the same purpose in the Sun 2 netboot process as tftpd(8) serves in the Sun 3 netboot process. Any second-stage network boot program always begins at block 16 of the exported disk, regardless of the length of the first-stage network boot program. All first- and second-stage network boot programs must have all executable headers stripped off; they must be raw binary programs. The remaining options are: -i interface Only listen for ND clients on interface interface. Normally ndbootd listens for clients on the first non-loopback IP interface that is up and running. -w windowsize This adjusts the window size of the ND protocol. This is the number of 1-kilobyte packets that can be transmitted before waiting for an acknowledgement. Defaults to 6. -d Run in debug mode. Debugging output goes to standard error and the server will not fork. FILES
/etc/ethers /etc/hosts SEE ALSO
tftpd(8) BUGS
Whether or not there is a second-stage network boot program, the exported disk appears to all clients to have infinite length. The content of all blocks not used by the first- or second-stage network boot programs is undefined. All client reads of undefined blocks are silently allowed by the server. BSD
May 9, 2001 BSD
