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IMP System Announcement (RFC0374)

IP.com Disclosure Number: IPCOM000003558D
Original Publication Date: 1972-Jul-19
Included in the Prior Art Database: 2000-Sep-13
Document File: 2 page(s) / 4K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

A.M. McKenzie: AUTHOR

Abstract

NEW IMP SYSTEM IS RELEASED ! On Tuesday July 18, the new IMP software described in previous RFC's (#331,#343,#359) was apparently successfully released. We ran from 10:00am on that day until Wednesday afternoon with very few network problems attributable to the new system. We are quite pleased with this performance, and expect to leave the new system up permanently!!

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 78% of the total text.

Network Working Group Alex McKenzie

RFC #374 BBN

NIC 11099 19 July 1972

There are two significant developments in the operation of the network

which should be of interest to all sites:

NEW IMP SYSTEM IS RELEASED !

On Tuesday July 18, the new IMP software described in previous RFC's

(#331,#343,#359) was apparently successfully released. We ran from

10:00am on that day until Wednesday afternoon with very few network

problems attributable to the new system. We are quite pleased with

this performance, and expect to leave the new system up permanently!!

We are, of course, aware that in any system of this size, bugs may

crop up at any time, and we solicit the help of the network community

in finding them. We also believe that the new system may have a

different "feel" to users, both terminal users and Hosts. We urge

everyone to have a bit of patience while getting used to any change in

the "feel" of the network. On the other hand, PLEASE REPORT ANY

SUSPECTED NETWORK MALFUNCTION TO THE NCC AS SOON AS POSSIBLE.

Evidence of bugs, guesses as to what went wrong, etc., are always

useful in hunting bugs, but don't let the lack of positive proof delay

the reporting of suspected system malfunction. The NCC telephone

number is (617) 661-0100. Feel free to call collect!

The one known shortcoming of the new software is the exacerbation of a

long-standing TIP software problem. The TIP now often appears to

neglect sending an Allocate control message for some active

connection, with the effect that the Server-to-User path becomes

blocked. We are giving the solution of this problem the highest

priority! (Our current data seems to indicate that this problem is

most likely to occur when there are several users and when the Server

Host is a TENEX system. If you know of other situations where this

problem has occurred, please let us know!)

Now that the new system is up, all sites with Model 516 IMPs will be

contacted by telephone and asked to reset the switches on their IMPs

as follows:

HALT INH - on

W.D.T. - on

AUTO RSTRT - on

MEMORY PRTCT - on

SITE POWER PROBLEMS

The network has recently been experiencing serious difficulties

related to the annual problem of more demand for electricity than is

available during the summer months. For example:

During the month of June, between 1/4 and 1/2 of the

IMP down time was due to site power failure.

During the weekend of July 15-16, two sites were down

all weekend due to air-conditioning failure which was

apparently related to power failures or brownouts.

This left several sites connected to the rest of the

net through only one path which, according to Murphy's

law, eventually failed - leaving nine sites partitioned

from the remainder.

...