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- The Diald README File
-
- ----------------------------------------------------------------------------
-
- This is release 0.16.5 of diald.
-
- Diald is a daemon that provides on demand IP links via SLIP or PPP. The
- purpose of diald is to make it transparently appear that you have a
- permanent connection to a remote site. Diald sets up a "proxy" device which
- stands in for the physical connection to a remote site. It then monitors the
- proxy, waiting for packets to arrive. When interesting packets arrive it
- will attempt to establish the physical link to the remote site using either
- SLIP or PPP, and if it succeeds it will forward traffic from the proxy to
- the physical link. As well, diald will monitor traffic once the physical
- link is up, and when it has determined that the link is idle, the remote
- connection is terminated. The criteria for bringing the link up and taking
- it down are configurable at run time, and are based upon the type of traffic
- passing over the link.
-
- Getting Diald
-
- The file is called diald-0.16.5.tar.gz. I've uploaded it to
- sunsite.unc.edu:/pub/Linux/incoming. It should move to
- sunsite.unc.edu:/pub/Linux/system/network/serial/diald-0.16.5.tar.gz after a
- suitable interval. It can also be obtained from the diald home page at
- "http://www.dna.lth.se/~erics/diald.html". Note that the diald home page has
- moved from its old location at the University of Toronto.
-
- Mailing List
-
- David S. Miller provides a mailing for the discussion of diald on his
- Majordomo server at vger.rutgers.edu. Send mail containing the line
- "subscribe linux-diald" in the BODY of the message to
- Majordomo@vger.rutgers.edu to join the list. Send mail with the word "help"
- in the body to get help on the correct use of the Majordomo list server. The
- mailing list is also mirrored in the USENET news linux hierarchy in the
- group "linux.dev.diald" for those who have news servers that get this
- hierarchy. Announcements of new releases are made on the mailing list, and
- its a good place to ask questions of users who already have diald up and
- running. I would prefer the mailing list to be my primary channel of
- communication with users. This gives you the added benefit of asking your
- questions of everyone on the list, many of whom may have the same question,
- or some of who may have already solved your problem. This minimizes the time
- I have to spend answering questions about diald, and gives me more time to
- spend improving the program. Let me repeat that. Please, if at all possible,
- use the mailing list to ask questions! I read the list every day, sometimes
- more than once, and your question will not be answered any more quickly if
- it is sent directly to me, in fact, if I don't see the answer to your
- question right away, then it may just get filed until I have time to deal
- with it. Someone on the mailing list will probably be able to suggest a
- solution to your problem well before that.
-
- The mailing list is being archived by Jeremy Hall . Copies of the archive
- can be obtained at ftp://rex.isdn.net/pub/diald. Currently the archives are
- updated once a month.
-
- FAQ
-
- There is a copy of the FAQ distributed with the diald release in the
- subdirectory "doc". This is the version that was current when the diald
- release was packaged. This may not be the most up to date version of the
- FAQ. The most up to date version can always be obtained from the diald home
- page. (See "Getting Diald" for the address of the home page.)
-
- Before Installation
-
- You must have SLIP devices in your kernel in order to use diald, EVEN IF YOU
- PLAN TO USE ONLY PPP CONNECTIONS! Let me repeat that, diald needs SLIP to
- work under all circumstances. It uses a SLIP link on a pseudo terminal to
- create the proxy device that stands in for the real connection. Naturally,
- if you plan on using diald to establish PPP connections, you must also have
- PPP devices in your kernel. You must also have a program like "chat" to do
- dialing.
-
- Configuring Diald
-
- Various pathnames that diald needs to know can be configured in "config.h".
- Edit this file appropriately. Most of what is here can be changed at run
- time, but it's nice to not have to specify extra runtime options because you
- where to lazy to edit the config.h file. The eventual installation location
- for the diald binaries, the man pages and the diald definitions files can be
- configured in the Makefile.
-
- Basic Installation (First Time Users)
-
- First run "make depend" then "make" and then "make install" as root. This
- makes the diald daemon and installs it. After installation you need to write
- a /etc/diald.conf file to be able to use diald. Read the manual page to find
- out what this file can contain. The diald-examples manual page gives several
- example diald.conf files.
-
- Installation If You Are Already Using an Earlier Version
-
- Unlike previous releases of diald, the basic installation procedure no
- longer installs an /etc/diald.conf file. Therefore, you can follow the same
- installation procedure as for first time users (above). The set of standard
- filters rules is now located in "/usr/lib/diald/standard.filter". This used
- to be installed as /etc/diald.conf. If you want, you can now include this
- file into your /etc/diald.conf file with the new "include" directive. If you
- wish to change the rules in this file you should just copy them into another
- file and edit them as desired. You can either place rules directly in
- /etc/diald.conf, or put then in another file that is included by
- /etc/diald.conf. In any case, the syntax of the filter rules has not changed
- between diald 0.14 and diald 0.15, so you should be able to continue using
- your old /etc/diald.conf file. If you want to use a particuarly old
- /etc/diald.conf file you may need to update some of the contents as the
- names and meanings of various commands have evolved a little over time. In
- particular a major change in syntax took place between version 0.3 and 0.4
- and a change in semantics took place between version 0.7 and 0.8 and again
- between 0.10 and 0.11. See the CHANGES file for more information. If you are
- planning to use diald with a kernel numbered 1.3.75 or greater, then you
- MUST compile diald using the include files for that kernel.
-
- Using Diald
-
- There are several manual pages that cover the use of diald. The "diald"
- manual page is the basic reference manual for diald. It will point you at
- other relevant manual pages. Of particular interest will be the
- "diald-examples" manual page, which will help you get diald configured. You
- might also want to look at the contents of the "contrib" directory in this
- distribution.
-
- Bugs, Limitations and Warnings
-
- There are some known problems and limitations.
-
- Lines in options files can contain at most 1024 characters. Longer lines are
- silently truncated.
-
- If there are no filter rules specified then no packets will be matched and
- the daemon won't do anything. It should probably match all packets by
- default in this case.
-
- Diald attempts to automatically adjust the MTU of the proxy to match the MTU
- of the actual connection negotiated by ppp, but this is not guaranteed to
- work, since changing the MTU on an active interface is not supported by the
- kernel. It is possible that an auto adjusted MTU will cause some long
- packets to get dropped on the floor. If you are having problems you should
- match these values manually. Diald will report the negotiated MTU in the
- system logs and warn you that you should adjust the settings.
-
- The monitor command represents a security risk as anyone who has access to a
- diald control fifo can ask diald to write to any named pipe in the system.
- Be careful with the permissions on your fifo's.
-
- Please send bug reports, patches or suggestions for improvements to me,
- preferably via the mailing list.
-
- Eric Schenk
- Eric.Schenk@dna.lth.se
-
- Lund, Sweden, January 28th, 1997.
-