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13 .\"    may be used to endorse or promote products derived from this software
17 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 .\" *troff -ms
34 of Berkeley\s-2\fP
55 has now embarked on a new development phase to
56 update other major components of the system, as well as to offer
59 The first is to develop an OSI network protocol suite and to integrate
61 The second is to develop and support an interface compliant with the
63 The third is to refine the TCP/IP networking to improve
65 The fourth is to provide a standard interface to file systems
68 The fifth is to evaluate alternate access control mechanisms and
70 with respect to network services.
71 Other areas of work include multi-architecture support, 
73 extensions to the 4.2BSD fast filesystem.
75 We are planning to finish implementation prototypes for each of the
90 Multi-architecture support
96 non-VAX processor, the CCI Power 6/32 and 6/32SX.  (This addition also
98 Harris HCX-7 and HCX-9, as well as the Sperry 7000/40 and ICL machines.)
101 and is otherwise similar to the VAX release of 4.3BSD.
102 The entire source tree, including all kernel and user-level sources,
104 of other processor families.  A MIPS R2000 has been donated to us,
115 patterns in the UNIX kernel and a hybrid strategy that is time-efficient
116 for small allocations and space-efficient for large allocations.
118 with a single easy-to-program interface,
122 performance loss is observed relative to the current implementations.
132 A utility was written to create and maintain the disk information,
133 and other user-level programs that use such information now obtain
136 knowledge of irregular disk geometries such as track-to-track skew.
145 The new ``fat'' filesystem allows these limits to be set at filesystem
147 Old kernels will treat the new filesystems as read-only,
150 The filesystem check facility, \fBfsck\fP, has also been modified to check
158 Since the release of 4.3BSD in mid 1986,
160 Our goal is to apply leading edge research ideas into a stable
166 The network architecture of 4.2BSD was designed to accommodate
170 We plan to 
173 to integrate these with an OSI transport class 4 (TP-4) implementation.
186 Wisconsin TP-4 to match GOSIP requirements.
188 implementation for the 4.2BSD kernel under contract to Mitre.
189 This implementation must be updated to reflect the National Institute
192 We will make this TP-4 operate with an OSI IP,
193 as the original implementation was built to run over the DoD IP.
195 A kernel version of the OSI IP and ES-IS protocols must be produced.
198 The required device drivers need to be integrated into a BSD kernel.
212 approach is to provide access to OSINET at UCB.
213 A second approach is to do the interoperability testing at
226 POSIX related changes to the BSD system have included a new terminal
228 functionality, restructured directory access routines, and new set-user
229 and set-group id facilities.
231 POSIX driver with extensions to provide binary compatibility with
233 We also have a prototype implementation of the 4.2BSD-based POSIX
240 The other groups are in comparatively early phases, with drafts
241 coming to ballot sometime in the 90's.
242 Berkeley will continue to participate in these groups, and
246 already implemented, and have other parties willing to contribute
249 Improvements to the TCP/IP Networking Protocols
251 The Internet and the Berkeley collection of local-area networks
254 connecting several UC campuses, Stanford and NASA-Ames
265 Laboratory has led to the design and implementation of several new algorithms
266 for TCP that improve throughput on both local and long-haul networks
270 The new algorithms include ``slow-start,''
275 A modification of this technique allows the sender to dynamically modify
276 the send window size to adjust to changing network conditions.
277 In addition, the round-trip timer has been modified to estimate the variance
278 in round-trip time, thus allowing earlier retransmission of lost packets
279 with less spurious retransmission due to increasing network delay.
288 We are continuing to refine the TCP and IP implementations
292 into the TP-4 protocol implementation.
301 It is frequently necessary to support several different remote
302 file system protocols, just as it is necessary to run several 
321 many of them by modifications to the C I/O library
322 similar to those in the Newcastle Connection [Brownbridge82].
324 Each design attempts to isolate file system-dependent details
325 below a generic interface and to provide a framework within which
334 Our effort in this area is aimed at providing a common framework to
335 support these different distributed file systems simultaneously rather than to
338 and discussion with their implementors to determine whether
339 they could modify their implementation to fit within our proposed
340 framework.  We have studied the various file system interfaces to determine
346 have been presented to major software vendors as an early step
349 name lookup but otherwise is closely related to Sun's VFS
357 Until now, we have taken a passive approach to dealing with
363 expeditiously disseminating the fix to the BSD mailing list.
364 This procedure has proven itself to be effective in
367 However, we feel that it would be useful to take a more active
370 utilities and network servers to find unintended system access mechanisms.
372 As a part of the work to make the system more resistant to attack
373 from local users or via the network, it will be necessary to produce
391 how to best integrate ACLs with the existing mechanism.
398 such processes are easy for a workstation user to obtain;
402 server [Steiner88] provides the best solution to this problem.
403 We propose to investigate Kerberos further as well as other
404 authentication mechanisms and then to integrate
412 We hope to replace the existing password authentication on each host
420 \fISoftware\- Practice and Experience\fP, Vol. 12, pp. 1147-1162, 1982.
427 pp. 131-150, June, 1985.
433 \fICSC-STD-001-83\fP,
440 Manchester, England, pp. 481-496, September 1986.
446 pp. 238-247, June, 1986.
451 \fIUsenix Conference Proceedings\fP, pp. 237-252, June, 1984.
457 pp 181-197, August 1984.
462 \fIUsenix Conference Proceedings\fP, pp. 519-531, June, 1985.
468 Manchester, England, pp. 451-460, September 1986.
474 pp. 295-303, June, 1988.
479 pp. 248-259, June, 1986.
485 pp. 260-269, June, 1986.
491 pp. 119-130, June, 1985.
496 \fIProc. 10th Symposium on Operating Systems Principles\fP, pp. 35-50,
502 \fIUsenix Conference Proceedings\fP, pp. 191-202, February, 1988.