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IMP(4)											   IMP(4)

       imp - 1822 network interface

	    NIMP count	   # ARPAnet IMP 1822 interface

       The imp interface, as described in BBN Report 1822, provides access to an intelligent mes-
       sage processor normally used when participating in the Department of Defense ARPA network.
       The  network  interface	communicates through a device controller, usually an ACC LH/DH or
       HDH or a DEC IMP-11A, with the IMP.  The interface is "reliable" and "flow-controlled"  by
       the host-IMP protocol.

       To  configure IMP support, at least one of acc(4), css(4) or hdh(4) must be included.  The
       count specifies the total number of IMP connections.  The  network  number  on  which  the
       interface  resides is specified at boot time using the SIOCSIFADDR ioctl.  The host number
       is discovered through receipt of NOOP messages from the IMP.

       The network interface is always in one of four states: up, down,  initializing,	or  going
       down.   When  the  system  is  booted, the interface is marked down.  If the hardware con-
       troller is successfully probed, the interface enters the initializing state and	transmits
       three  NOOP  messages  to  the IMP.  It then waits for the IMP to respond with two or more
       NOOP messages in reply.	When it receives these messages it  enters  the  up  state.   The
       ``going	down''	state  is entered only when notified by the IMP of an impending shutdown.
       Packets may be sent through the interface only while it is  in  the  up	state.	 Outgoing
       packets	are dropped with the error ENETDOWN returned to the caller if the interface is in
       any other state.

       imp%d: not configured.  A hardware interface could not be attached  during  autoconfigura-
       tion because too few IMP pseudo-devices were configured.

       imp%d:  leader  error.  The IMP reported an error in a leader (1822 message header).  This
       causes the interface to be reset and any packets queued up for transmission to be purged.

       imp%d: going down in 30 seconds.
       imp%d: going down for hardware PM.
       imp%d: going down for reload software.
       imp%d: going down for emergency reset.  The Network Control Center (NCC)  is  manipulating
       the IMP.  By convention these messages are reported to all hosts on an IMP.

       imp?: host %x, lost %d rfnms.  The IMP had messages outstanding to the host listed, but no
       RFNM (Request for Next Message) messages were received from the IMP in 127  seconds.   The
       software state for that host is reinitialized.

       imp%d: interface reset.	The host has received an interface reset message from the IMP.

       imp%d: address reset to x%x (%d/%d).  The host has received a NOOP message which caused it
       to reset its notion of its current address.  The Internet address is printed in	hexadeci-
       mal,  with the host and IMP numbers following.  This indicates that the address originally
       set by ifconfig(8) was incorrect, that the IMP has undergone an identity crisis,  or  that
       communication between the IMP and the host is being garbled.

       imp%d: data error.  The IMP noted an error in data transmitted.	The host-IMP interface is
       reset and the host enters the init state (awaiting NOOP messages).

       imp%d: interface reset.	The reset process has been completed.

       imp%d: marked down.  After receiving a "going down in 30 seconds" message, and waiting  30
       seconds,  the  host has marked the IMP unavailable.  Before packets may be sent to the IMP
       again, the IMP must notify the host, through a series of NOOP messages, that  it  is  back

       imp%d: can't handle af%d.  The interface was handed a message with addresses formatting in
       an unsuitable address family; the packet was dropped.

       intro(4N), inet(4F), acc(4), css(4), hdh(4), implog(8), implogd(8)

3rd Berkeley Distribution		  August 2, 1987				   IMP(4)
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