DHCPD(8)                                                 DHCPD(8)

     NAME
          dhcpd, dhcpleases, rarpd, tftpd - Internet booting

     SYNOPSIS
          ip/dhcpd [-dmnprsSZ] [-f ndb-file] [-M secs] [-x netmtpt]
          [-Z secs] [ address n ] ...

          ip/dhcpleases

          ip/rarpd [-d] [-e etherdev] [-x netmtpt]

          ip/tftpd [-dr] [-h homedir] [-x netmtpt]

     DESCRIPTION
          These programs support booting over the Internet.  They
          should all be run on the same server to allow other systems
          to be booted.  Dhcpd and tftpd are used to boot everything;
          rarpd is an extra piece just for Suns.

          Dhcpd runs the BOOTP and DHCP protocols.  Clients use these
          protocols to obtain configuration information.  This infor-
          mation comes from attribute/value pairs in the network data-
          base (see ndb(6) and ndb(8)). DHCP requests are honored both
          for static addresses found in the NDB and for dynamic
          addresses listed in the command line.  DHCP requests are
          honored if either:
          - there exists an NDB entry containing both the ethernet
          address of the requester and an IP address on the originat-
          ing network or subnetwork.
          - a free dynamic address exists on the originating network
          or subnetwork.

          A BOOTP request is honored if all of the following are true:
          - there exists an NDB entry containing both the ethernet
          address of the requester and an IP address on the originat-
          ing network or subnetwork.
          - the entry contains a bootf= attribute
          - the file in the bootf= attribute is readable.

          Dynamic addresses are specified on the command line as a
          list of addresses and number pairs.  For example,
               ip/dhcpd 10.1.1.12 10 10.2.1.70 12
          directs dhcpd to return dynamic addresses 10.1.1.12 through
          10.1.1.21 inclusive and 10.2.1.70 through 10.2.1.81 inclu-
          sive.

          Dhcpd maintains a record of all dynamic addresses in the
          directory /lib/ndb/dhcp, one file per address.  If multiple
          servers have access to this common directory, they will cor-
          rectly coordinate their actions.

     DHCPD(8)                                                 DHCPD(8)

          Attributes come from either the NDB entry for the system,
          the entry for its subnet, or the entry for its network.  The
          system entry has precedence, then the subnet, then the net-
          work.  The NDB attributes used are:

          ip      the IP address
          ipmask  the IP mask
          ipgw    the default IP gateway
          dom     the domain name of the system
          fs      the default Plan 9 file server
          auth    the default Plan 9 authentication server
          dns     a domain name server
          ntp     a network time protocol server
          time    a time server
          wins    a NETBIOS name server
          www     a World Wide Web proxy
          pop3    a POP3 mail server
          smtp    an SMTP mail server
          bootf   the default boot file; see ndb(6)

          Dhcpd will answer BOOTP requests only if it has been specif-
          ically targeted or if it has read access to the boot file
          for the requester.  That means that the requester must spec-
          ify a boot file in the request or one has to exist in NDB
          for dhcpd to answer.  Dhcpd will answer all DHCP requests
          for which it can associate an IP address with the requester.
          The options are:

          d    Print debugging to standard output.

          f    Specify a file other than /lib/ndb/local as the network
               database.

          m    Mute: don't reply to requests, just log them and what
               dhcpd would have done.

          M    Use secs as the minimum lease time for dynamic
               addresses.

          n    Don't answer BOOTP requests.

          p    Answer DHCP requests from PPTP clients only.

          r    Mute static addresses: don't reply to requests for
               static addresses, just log them and what dhcpd would
               have done.

          s    Sleep 2 seconds before answering requests for static
               addresses.  This is used to make a server be a backup
               only.

          S    Sleep 2 seconds before answering requests for dynamic

     DHCPD(8)                                                 DHCPD(8)

               addresses.

          x    The IP stack to use is mounted at netmtpt. The default
               is /net.

          Z    Use secs as the minimum lease time for static
               addresses.

          Dhcpleases prints out the currently valid DHCP leases found
          in the /lib/ndb/dhcp directory.

          Rarpd performs the Reverse Address Resolution Protocol,
          translating Ethernet addresses into IP addresses.  The
          options are:

          d    Print debugging to standard output.

          e    Use the Ethernet mounted at /net/etherdev.

          x    The IP stack to use is mounted at netmtpt. The default
               is /net.

          Tftpd transfers files to systems that are booting.  It runs
          as user none and can only access files with global read per-
          mission.  The options are:

          d    Print debugging to standard output.

          x    The IP stack to use is mounted at netmtpt. The default
               is /net.

          h    Change directory to homedir. The default is /lib/tftpd.
               All requests for files with non-rooted file names are
               served starting at this directory with the exception of
               files of the form xxxxxxxx.SUNyy.  These are Sparc ker-
               nel boot files where xxxxxxxx is the hex IP address of
               the machine requesting the kernel and yy is an archi-
               tecture identifier.  Tftpd looks up the file in the
               network database using ipinfo (see ndb(2)) and responds
               with the boot file specified for that particular
               machine.  If no boot file is specified, the transfer
               fails.  Tftpd supports only octet mode.

          r    Restricts access to only those files rooted in the
               homedir.

     FILES
          /lib/ndb/dhcp    directory of dynamic address files

     SOURCE
          /sys/src/cmd/ip

     DHCPD(8)                                                 DHCPD(8)

     SEE ALSO
          ndb(6), booting(8)