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  man pages->Tru64 Unix man pages -> dhcpcemu (8)              



NAME    [Toc]    [Back]

       dhcpcemu - Emulate a DHCP client

SYNOPSIS    [Toc]    [Back]

       /usr/sbin/dhcpcemu  [-b]  [-q]  [-m  | -n  | -v] [-dn] [-a
       server_address] [-c client_address] [-e  hardware_address]
       [-h      hostname]      [-i     client_identifier]     [-r
       requested_address] [-p bootp | discover | renew | rebind |
       request  |  select  |  decline] [-s size] [-t timeout] [-f
       file] interface

OPTIONS    [Toc]    [Back]

       Sets the broadcast bit.  Runs quietly: display neither the
       contents  of  the incoming nor the outgoing packets.  Sets
       the magic cookie in the outgoing packet to be the CMU (-m)
       or  the  RFC1048 (-v ) value (the default).  The -n option
       means to use no cookie  at  all.   The  server  identifier
       field  in the options of the outgoing packet is set to the
       IP address.  To properly emulate a client in the selecting
       DHCP state, this field is required regardless of the value
       given with the -p option.  Sets the ciaddr  field  in  the
       packet to the value client_address or to the IP address of
       the interface chosen  if  client_address  equals
       Pretend  to  be  at  the given hardware (MAC) address. The
       chaddr field  is  set  to  hardware_address.   Unless  the
       broadcast  bit  is  also  set,  this usually means that no
       replies will be received, as the server  or  relay  agents
       will  normally  try  a  link-level  unicast  to  the phony
       address.  Sets the hostname option in the outgoing  packet
       to  the given value.  Sets the client identifier option in
       the outgoing packet to the given  string.  The  string  is
       treated literally, not as a hex representation of an arbitrary
 octet string.  Sets the IP address value in the outgoing
  packet.  This  option  is  required if the outgoing
       packet is to validly represent a client in the DHCP states
       selecting  or rebooting or in a DHCP DECLINE message.  The
       string following determines the  kind  of  BOOTP  or  DHCP
       packet  sent,  and whether the packet is broadcast or unicast.
  The default is to emulate a BOOTP client.  Sends  a
       packet  of  size  octets  (by  default 548 octets).  Exits
       after timeout seconds if no responses are received.   Sets
       the file field in the outgoing packet to the given string.

DESCRIPTION    [Toc]    [Back]

       The  dhcpcemu  command  emulates  a   DHCP/BOOTP   client.
       Options  are  provided to set the most important fields in
       the BOOTP request packet.  A  packet  is  constructed,  is
       sent through the interface specified, and a reply awaited.
       The emulator exits after the first reply  is  received  or
       for a length of time specified by the -t option. Depending
       on the options specified and/or the DHCP server configuration,
  no  reply may in fact be forthcoming. If no timeout
       is specified, the emulator may be killed with any suitable
       asynchronous signal.  The SIGINT signal (usually generated
       from the keyboard with Ctrl/c) is available if dhcpcemu is
       running in the foreground.

       It  is  important to note that with the options available,
       it is quite possible to create an illegal packet. This  is
       one  of  the  primary  functions  of dhcpcemu; to test the
       behavior of servers when confronted with packets  that  do
       not conform to the standards.

RESTRICTIONS    [Toc]    [Back]

       A  cluster member should never be a DHCP client. It should
       always use static addressing.

       If a cluster is to support a DHCP  server,  there  can  be
       only  one  DHCP server for all the cluster members using a
       common database with failover.

SEE ALSO    [Toc]    [Back]

       RFC2031, RFC2032

[ Back ]
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