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Subj: dialup ppp 4.0 - general
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DP - General Information
Overview
This software was developed to provide dialup on demand PPP over high speed
modems. In many situations, leased lines are used to provide TCP/IP links
over significant distances. With the advent of V.32bis (and later V.34)
modems, and with this software, another alternative exists. It appears to
the application that the modems remain connected all the time (like a leased
line). In reality, however, they disconnect whenever there is no traffic.
When a packet to be transmitted arrives at the interface, and the modems are
not connected, a connection is made and the packets begin to flow again.
Target Audience
This file contains information for those intending to install and use dp
(Dialup PPP), and is not aimed at teaching you about TCP/IP networking,
although subjects which may be new to you such as routing and nameservers
will be mentioned. This is a summary
Credits
The base for this software is several other free packages that have been
modified to support this purpose. The dialup code came from the BBN Dialup
Slip. The PPP program is from Carnegie Mellon University. The kernel PPP
streams driver originally came from Brad K. Clements. Since it now bears
such little resemblence to his work, he has relinquished all copyrights. The
TCP/IP header compression support came from Van Jacobson from the University
of California. Kirk Smith at Purdue University assembled all these pieces,
made them all work together, and added a number of features beyond the
original software.
The bulk of the work has been done at Purdue University by Kirk Smith
<ks@acn.purdue.edu> and has been supported by the Purdue Agricultural
Computer Network. The Purdue ACN is responsible for networking 98 remote
computers to the campus internet.
Peter Galbavy of Micromuse Ltd. <Peter.Galbavy@micromuse.co.uk> has provided
invaluable help in several areas. Among these, were the loadable module
support, integration of newer PPP revisions, significant work on this
document, and much testing and several bug fixes.
Ignatios Souvatzis <ignatios@cs.uni-bonn.de> has offered a great deal of
assistance in testing loadable modules and testing beta releases, providing
many fixes.
Jeff Schwab <jrs@ecn.purdue.edu> has provided updates to the PPP code to
bring the software in line with current revisions of the PPP standard.
Mark Seiden <mis@seiden.com> has edited this document and greatly improved
the readability.
Jim Thompson <jim@tadpole.com> has provided many fixes to the kernel modules
and the DP package in general.
Frank D. Cringle <fdc@cliwe.ping.de> has provided many fixes to the lock
management in the kernel modules as well as providing updates for the
correct operation of rfc1332 Van Jacobsen Header Compression negotiation.
Marc Boucher <marc@CAM.ORG>integrated SLIP support, support for terminal
server modems, and sync support. Also, Marc has been a great help in
tracking down numerous bug fixes.
Tim Rylance <tkr@puffball.demon.co.uk> integrated a number of pieces of the
Solaris 1.X software into the Solaris 2.X version to merge the source trees
together for the 4.0 release.
Release History
Major Versions
* dp-2 supports Solaris 1.X (SunOS4.X)
* dp-3 supports Solaris 2.X (SunOS5.X)
* dp-4 supports both Solaris 1.X (SunOS4.X) and Solaris 2.X (SunOS5.X).
Since the introduction of dp-4, the older releases are obsolete.
dp-4.0beta1
* Solaris 1 support is now merged in.
* No more pesky message at boot time about IFF_POINTOPOINT not set
(Sol2).
* Not setting ACCESS file in conf file will not cause core dump.
* Terminal server modems now supported.
* Running over pseudo tty now works reliably.
* PPP sync module now available.
* SLIP now supported.
* Snoop and tcpdump now supported in Solaris 2 as well as Solaris 1.
* Most C code is ANSI compatible
* Many compiler warnings fixed.
* Silly interface addresses flagged.
dp-3.1.4:
* Eliminated unecessary error messages on dropped lines.
* Fixed bug in dp device driver which could cause a kernel crash in
dp_activity().
* The vast majority of the updates in dp-3.1.4 are due to the work of Tim
Rylance . Thanks Tim.
* PPP is now based on ppp-2.1.2, whereas dp-3.1.3 and dp-2.3.2 are based
on ppp-1.3 or 1.4.
* Advantages of the new version include
o working CHAP and PAP authentication (see newdoc/Authentication)
o negotiation automaton conforms to the current PPP RFCs and seems
to have fewer convergence problems
o much better LOG_LEVEL=3 tracing makes negotiation problems much
easier to diagnose
* I have tested it on both Solaris 2 and SunOS 4 against
o Morningstar (Demon Internet)
o Ascend (BTnet, using CHAP authentication)
o ppp-2.1.2 (using CHAP and PAP authentication)
dp-3.1.3
* New PPP option "dynamic" should allow dynamic addresses.
* Comments are allowed in /etc/dp/hostnames
* Static routes can be placed in /etc/dp/routes
* PPP talks to rfc1332 PPP's by default
* Support for pre1332 PPP's tested
* PPP options -vjcomp and vj-max-slots now available
* Bugs in VJ compression now fixed
* Very Short IP packets not dropped on input
* Several rare panics fixed in dp driver
* dpd works with more than 50 interfaces by increasing the limit of open
files
* MAGMA serial port speed mapping supported.
* US Robotics V.everything modem tested (modem/usr.com script/usr-dial)
dp-3.1.2
* Three bugs fixed in sys/dp.c that would cause kernel panics
o restarted dpd could cause message buffers to be freed twice,
leading to Data Fault
o panic on input when messages are processed after I_UNLINK, causing
Data Fault in dplrput().
o panic when incoming and outgoing calls happen simultaneously and
mutex_exit got called twice from dp_state().
* callwait timeout was increased in access files
* t3000-dial and telebit.com files were updated to be compatible with
FlexFax
* The daily cron script was updated a bit
* Refuses to accept loopback addresses for interfaces
* recv and use can have more arguments in dial scripts
* Central Data 115.1 and 230.2 support added
* Uucp locking locks both incoming and outgoing devices
dp-3.1
* /var/spool/locks handled better for interface to ttymon
* strtok_r function provided for older OS (Solaris 2.0 & 2.1)
* Two calls to alloca changed to malloc in ppp/main.c
* New access file format
* Does not drop routes in Solaris 2.2
* Should work for x86 Solaris
* Dptrace works
* Alternate phone numbers can be listed for busy conditions
* ppp does not core dump due to freeing non-malloced memory
* now supports PRE_AUX, POST_AUX, and FAIL_AUX scripts
* Lots of little fixes
Supported Platforms
dp-4.0 runs on all versions of Solaris available as of July 28, 1995. It is
known to run on SPARC, x86, and Sun3 hardware. If you have problems with
specific hardware/software configurations, please relay the fixes to Kirk
Smith (ks@acn.purdue.edu)
Commercial Software
Companies sell products that do things similar to this. I believe that this
software incorporates some unique features and has value in itself. However,
if you want a supported product, you might want to shop around.
Morning Star Technologies is one company that I know of. Try sending mail to
marketing@morningstar.com for more information. From what I can tell, they
have a top notch product and top notch support.
Sun provides PPP bundled with Solaris 2.3 or later. This product is somewhat
limited and has some problems, but continues to improve with each release.
Mailing List
A mailing list "dp@acn.purdue.edu" is available. This list is a group of
people either using or thinking about using this software. To subscribe to
this list, send an email message to majordomo@acn.purdue.eduwith the text
index dp
To retrieve an archive, send mail to majordomo@acn.purdue.edu with the text
get dp
for example:
get dp 95.03
Majordomo will respond by sending you all of the messages in the selected
archive as individual mail messages.
To interactively search the archives using your Web browser, use the URL
http://www.acn.purdue.edu/maise/cgi-bin/maise/dp
------------------------------------------------------------------------
o DP Documentation
o DP Home Page
------------------------------------------------------------------------
Kirk Smith / ks@acn.purdue.edu Last updated: 16 August 1995
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