RFC 611 (rfc611) - Page 1 of 4

Two changes to the IMP/Host Protocol to improve user/network communications

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Network Working Group                                          D. Walden
RFC # 611                                                        BBN-NET
NIC # 21354                                            February 14, 1974

                  TWO CHANGES T0 THE IMP/HOST PROTOCOL
                TO IMPROVE USER/NETWORK COMMUNICATIONS*

1.  A Reminder

    When a host receives an IMP-Going Down message from its IMP (see
page 3-15 of BBN Report 1822, Specifications for the Interconnection of
a Host and an IMP), the Host should forward the information included in
the IMP-Going-Down message to its users from the network and its local
users of the network.  Further, we suggest that the Host keep this
information around after the IMP has gone down, in order to tell local
users who are attempting to use the network.

    In the next two sections of the RFC, we describe modifications to
the IMP/Host protocol which will allow the IMPs to distribute the same
sort of information about Hosts which are down.

2.  Expansion of the Host-Going-Down Message

    The type 2, Host-Going-Down, message described on page 3-1l of BBN
Report 1822 has not previously allowed for any provision by the Host for
additional information such as why, when, and for how long the Host is
going down. The following describes a modification to the Host-Going-
Down message which permits the Host to supply this additiona1
information.

    In a type 2, Host-Going-Down message, bits 17-28 give the time of
the Host's coming back up, bit-coded as follows:

bits 17-19:  the day of the week the Host is coming back up. Monday is
             day 0 and Sunday is day 6.

bits 20-24:  the hour of the day, from hour 0 to hour 23, that the Host
             is coming back up.

bits 25-28:  the five minute interval, from 0 to 11, in the hour that
             the Host is coning back up.

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*Please file this RFC with your copy of BBN Report 1822 until that
report is updated.






Walden
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