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SLIP/PPP Emulator mini-HOWTO
SLIP/PPP Emulator mini−HOWTO
Irish
irish@eskimo.com
Glen Reesor − Converted document from HTML to DocBook v4.1 (SGML)
2001−02−21
Revision History
Revision 3.1
21 February 2001
Revised by: GCR
Revision 3.0
7 August 1997
Revised by: Irish
This document will describe how to get your Linux box to connect to a generic site via a SLIP/PPP emulator,
such as SLiRP or TIA. I take no responsibility for your use of this information, but corrections are welcome.
I will not attempt to describe all that can be done over this connection once established, but I will refer you to
other documents or sites that will contain the relevant information.
That done, let's do it!
SLIP/PPP Emulator mini−HOWTO
Table of Contents
1. Introduction. ....................................................................................................................................................1
1.1. Copyright Information. .....................................................................................................................1
1.2. Disclaimer. ........................................................................................................................................1
1.3. New Versions. ...................................................................................................................................2
1.4. Feedback. ..........................................................................................................................................2
2. How Does an Emulator Work?. .....................................................................................................................3
2.1. What is TIA?. ....................................................................................................................................3
2.2. What is SLiRP?. ................................................................................................................................3
2.3. What about Term?.. ...........................................................................................................................3
2.4. What about real SLIP/PPP?. .............................................................................................................3
3. Prerequisites. ...................................................................................................................................................5
4. Preparing your Linux Machine. ....................................................................................................................6
4.1. Compiling your Kernel. ....................................................................................................................6
4.2. Edit some files in /etc. .......................................................................................................................6
4.3. DIP. ...................................................................................................................................................7
4.3.1. DIP Notes. .........................................................................................................................8
4.4. PPP. ...................................................................................................................................................9
5. Now What?. ...................................................................................................................................................11
5.1. Mail. ................................................................................................................................................11
5.2. News ...............................................................................................................................................11
5.3. Mosaic/Netscape. ............................................................................................................................11
6. Miscellaneous. ................................................................................................................................................12
6.1. References. ......................................................................................................................................12
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1. Introduction
I am Irish, < irish@eskimo.com > , available for comment on Linux almost everyday, when I'm not
petting my cat or hugging my kid.
This HOWTO is available in the following places:
·
1.1. Copyright Information
This document is copyrighted (c) 2001 Irish and is distributed under the terms of the Linux Documentation
Project (LDP) license, stated below.
Unless otherwise stated, Linux HOWTO documents are copyrighted by their respective authors. Linux
HOWTO documents may be reproduced and distributed in whole or in part, in any medium physical or
electronic, as long as this copyright notice is retained on all copies. Commercial redistribution is allowed and
encouraged; however, the author would like to be notified of any such distributions.
All translations, derivative works, or aggregate works incorporating any Linux HOWTO documents must be
covered under this copyright notice. That is, you may not produce a derivative work from a HOWTO and
impose additional restrictions on its distribution. Exceptions to these rules may be granted under certain
conditions; please contact the Linux HOWTO coordinator at the address given below.
In short, we wish to promote dissemination of this information through as many channels as possible.
However, we do wish to retain copyright on the HOWTO documents, and would like to be notified of any
plans to redistribute the HOWTOs.
If you have any questions, please contact < irish@eskimo.com >
1.2. Disclaimer
No liability for the contents of this documents can be accepted. Use the concepts, examples and other content
at your own risk. As this is a new edition of this document, there may be errors and inaccuracies, that may of
course be damaging to your system. Proceed with caution, and although this is highly unlikely, the author(s)
do not take any responsibility for that.
All copyrights are held by their by their respective owners, unless specifically noted otherwise. Use of a term
in this document should not be regarded as affecting the validity of any trademark or service mark.
Naming of particular products or brands should not be seen as endorsements.
You are strongly recommended to take a backup of your system before major installation and backups at
regular intervals.
1. Introduction
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SLIP/PPP Emulator mini−HOWTO
1.3. New Versions
The latest version number of this document can be found at:
·
1.4. Feedback
Feedback is most certainly welcome for this document. Without your submissions and input, this document
wouldn't exist. Please send your additions, comments and criticisms to the following email address :
1.3. New Versions
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2. How Does an Emulator Work?
It is important to understand how a SLIP/PPP emulator works in general, to be aware of its limitations. First,
you do not need to install the emulator on your machine. It runs on your remote host only. What you need on
your machine is the TCP/IP and SLIP or PPP protocols installed in your kernel (more on that in a bit), and
some clients.
Here's what happens: you send network requests from your machine to your remote host over the SLIP/PPP
link. The emulator grabs them and sends them out to the Net at large. Then, incoming data is sent back from
the Net to your account on the remote host, where the emulator grabs it and sends it back over the SLIP/PPP
link to your machine. So, to the Net it appears as if you are working out of your account on the remote host,
but to you it looks like you are really connected right to the Net.
As you can see, this can confuse stuff that is incoming from the Net. For example, talk doesn't work via an
emulator, because the incoming talk request tries to start the remote hosts talk daemon, not yours.
The other big difference between an emulator and real SLIP/PPP is you are NOT assigned your own IP
address; remember, you are only converting a dialup account to a SLIP/PPP connection.
2.1. What is TIA?
The Intenet Adaptor was written by the fine folks at marketplace.com. They have quit working on it now, and
consider it a 'mature' product. The last version is 2.05; if you are going to use TIA, please get this version.
Note: At last report, marketplace.com have gone out of business.
2.2. What is SLiRP?
This is a freeware application, covered under the GNU Public License. It is out of beta, and is real stable. It
sports a few more features than TIA, and is (reportedly) easier on host resources. Available at fine Linux FTP
sites everywhere.
2.3. What about Term?
If you don't have root access to your machine for one reason or another, and you can't persuade someone who
does to install SLIP and dip, then you won't have much choice except to use Term. If you want to know more
about Term, please read the HOWTO on Sunsite.
2.4. What about real SLIP/PPP?
Hey, a lot of places are offering real SLIP/PPP at reasonable prices for non−dedicated dialup nowadays. If
you can afford it, or feel the need, go for it. The Real Thing is always better than emulation. However, one of
the things an emulator provides is security; it acts as an impregnable firewall, and with it you are pretty much
2. How Does an Emulator Work?
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