141 lines
5.7 KiB
HTML
141 lines
5.7 KiB
HTML
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<TITLE>Diald Howto: Conecting a computer to a group of different ISPs with a modem and PPP</TITLE>
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<LINK HREF="Diald-HOWTO-8.html" REL=next>
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<LINK HREF="Diald-HOWTO-6.html" REL=previous>
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<LINK HREF="Diald-HOWTO.html#toc7" REL=contents>
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<A HREF="Diald-HOWTO-8.html">Next</A>
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<A HREF="Diald-HOWTO-6.html">Previous</A>
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<A HREF="Diald-HOWTO.html#toc7">Contents</A>
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<HR>
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<H2><A NAME="s7">7. Conecting a computer to a group of different ISPs with a modem and PPP</A></H2>
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<P>
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<P>Many times, one standalone computer does not only connect to just one
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network. It is common to connect to different networks or to the Internet
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using some different service providers. In this case, changing
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configuration files each time you want to connect to a different site can
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be annoying.
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<P>The solution i propose here consist in using different sets of
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configuration files for each different connection. You can find here some
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scripts to automate changing from one to another.
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<P>
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<H2><A NAME="ss7.1">7.1 Note about sending mail using a relay host</A>
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</H2>
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<P>
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<P>If your email client program uses a local Message Transfer Agent with a
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<CODE>smtp</CODE> relay host to send all messages, or if you use a email client
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program that sends the messages directly to your provider's <CODE>smtp</CODE>
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server, changing where you are connecting means you need to reconfigure
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this option for the <CODE>smtp</CODE> relay server. This is because the providers
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usually check if the receipt mailbox is local or to any domain directly
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maintained by this provider or if the origin ip address is from the range
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of ip addresses that this provider assigns, to avoid having an open relay
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server that can be used to send spam, anonymous message and so on.
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<P>In the following examples, you will find how to change this parameter in
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the <EM>Smail</EM> configuration files in a simple configuration where all
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external messages are sent to a <CODE>smtp</CODE> relay server. If you use another
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Message Transfer Agent (MTA) in your system, you can send me what you must
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change in your MTA to include it here. If you use an email client program
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that directly sends to the external <CODE>smtp</CODE> server (Kmail, Netscape,
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etc.) send me your changes too.
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<P>
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<H2><A NAME="ss7.2">7.2 Scripts to automate multiple connections and changing from one to another</A>
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</H2>
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<H3>Starting up</H3>
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<P>
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<P>First of all, create a subdirectory of <CODE>/etc/diald</CODE> called
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<CODE>providers</CODE> where you store your scripts to automatically change from
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one to another provider and the subdirectories with the set of files to
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configure each of the providers connections.
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<P>With the next script this directory is created and filled with the
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current configuration files from <EM>Diald</EM>, <EM>chat</EM>, <EM>pppd</EM> and
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<EM>Smail</EM>, that will be treated as a template for the next
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configurations.
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<P>
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<BLOCKQUOTE><CODE>
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<PRE>
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#!/bin/sh
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#File /etc/diald/providers/setupdialdmultiprovider
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mkdir /etc/diald/providers
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mkdir /etc/diald/providers/setup
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cp /etc/ppp/pap-secrets /etc/diald/providers/setup
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cp /etc/ppp/chap-secrets /etc/diald/providers/setup
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cp /etc/resolv.conf /etc/diald/providers/setup
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cp /etc/diald/diald.options /etc/diald/providers/setup
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cp /etc/diald/standard.filter /etc/diald/providers/setup
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cp /etc/diald/personal.filter /etc/diald/providers/setup
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cp /etc/diald/diald.connect /etc/diald/providers/setup
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cp /etc/chatscripts/provider /etc/diald/providers/setup
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cp /etc/diald/ip-up /etc/diald/providers/setup
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cp /etc/diald/ip-down /etc/diald/providers/setup
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cp /etc/smail/routers /etc/diald/providers/setup
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</PRE>
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</CODE></BLOCKQUOTE>
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<P>
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<H3>New provider</H3>
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<P>
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<P>With the next script the template configuration will be copied to a new
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directory to prepare it for a new provider connection or a new net
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connection. This script (<CODE>/etc/diald/providers/newdialdprovider</CODE>)
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will need a parameter with the provider or net name.
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<P>
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<BLOCKQUOTE><CODE>
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<PRE>
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#!/bin/sh
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#File /etc/diald/providers/newdialdprovider
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mkdir /etc/diald/providers/$1
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cp /etc/diald/providers/setup/* /etc/diald/providers/$1
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</PRE>
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</CODE></BLOCKQUOTE>
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<P>Now, you will modify as you need the new files in
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<CODE>/etc/diald/providers/provdidername</CODE>, being <CODE>providername</CODE>
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the parameter passed to <CODE>newdialdprovider</CODE>.
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<P>
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<H3>Changing from one to another</H3>
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<P>
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<P>At the end, with this script you will change all your configuration files
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related to <EM>Diald</EM> to connect to another provider or net. I use
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symbolic links to avoid using duplicate files. Using symbolic links, if
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you change any config file in its original location like
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<CODE>/etc/resolv.conf</CODE>, the change is really made in the
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<CODE>/etc/diald/providers/providername/resolv.conf</CODE> file.
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<P>
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<BLOCKQUOTE><CODE>
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<PRE>
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#!/bin/sh
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#File /etc/diald/providers/setdialdprovider
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/etc/init.d/diald stop
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#wait for Diald to stop.
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sleep 4
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ln -sf /etc/diald/providers/$1/pap-secrets /etc/ppp
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ln -sf /etc/diald/providers/$1/chap-secrets /etc/ppp
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ln -sf /etc/diald/providers/$1/resolv.conf /etc
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ln -sf /etc/diald/providers/$1/diald.options /etc/diald
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ln -sf /etc/diald/providers/$1/standard.filter /etc/diald
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ln -sf /etc/diald/providers/$1/personal.filter /etc/diald
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ln -sf /etc/diald/providers/$1/diald.connect /etc/diald
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ln -sf /etc/diald/providers/$1/provider /etc/chatscripts
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ln -sf /etc/diald/providers/$1/ip-up /etc/diald
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ln -sf /etc/diald/providers/$1/ip-down /etc/diald
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ln -sf /etc/diald/providers/$1/routers /etc/smail
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/etc/init.d/diald start
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</PRE>
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</CODE></BLOCKQUOTE>
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<P>
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<HR>
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<A HREF="Diald-HOWTO-8.html">Next</A>
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<A HREF="Diald-HOWTO-6.html">Previous</A>
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<A HREF="Diald-HOWTO.html#toc7">Contents</A>
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