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<sect1 id="connectivity-ppp-server">
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<title>The Server Computer</title>
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1c6890 |
<para>
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1c6890 |
When you are configuring the server computer, you need to
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install and configure both <application>mgetty</application>
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and <application>pppd</application> programs. The
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1c6890 |
<application>mgetty</application> program lets you attend
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incoming calls and must be configured to run through
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<systemitem class="daemon">init</systemitem> daemon in order
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to take control over the Modem device. By default, inside
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1c6890 |
&TC;; (release 5.5), <application>mgetty</application> isn't
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1c6890 |
configured to start with
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1c6890 |
class="daemon">init</systemitem> daemon so you need to do it
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yourself (see
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linkend="connectivity-ppp-server-mgetty-inittab" />).
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1c6890 |
Later, for attending connection requests, you need to
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1c6890 |
configure <application>mgetty</application> to use the
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<application>pppd</application> program, so the Point-to-Point
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Protocol (PPP) can be talked and IP packages can be exchange
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between the client computer and the server computer. Later,
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9846e2 |
you need to configure <application>pppd</application> to
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9846e2 |
adjust it to your needs (see
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linkend="connectivity-ppp-server-pppd-options" />). Once
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9846e2 |
you've configured both <application>mgetty</application> and
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1c6890 |
<application>pppd</application> programs, the server computer
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should be ready to attend incoming calls.
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1c6890 |
</para>
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1c6890 |
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73737d |
<sect2 id="connectivity-ppp-server-mgetty">
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1c6890 |
<title><package>mgetty</package></title>
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1c6890 |
<para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
Taken from <command>mgetty</command> man page: — Mgetty
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1c6890 |
is a <quote>smart</quote> getty replacement, designed to be
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1c6890 |
used with hayes compatible data and data/fax modems. Mgetty
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1c6890 |
knows about modem initialization, manual modem answering (so
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1c6890 |
your modem doesn’t answer if the machine isn’t ready), UUCP
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1c6890 |
locking (so you can use the same device for dial-in and
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dial-out). Mgetty provides very extensive logging facilities
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1c6890 |
—.
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1c6890 |
</para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
<para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
Before using the configuration provided here, it would be
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2746a1 |
useful for you to read the documentation provided in the
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1c6890 |
<package>mgetty</package> and <package>SysVinit</package>
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packages. This will let you to understand what you are
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1c6890 |
configuring.
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1c6890 |
</para>
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1c6890 |
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73737d |
<sect3 id="connectivity-ppp-server-mgetty-inittab">
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
<title><filename>/etc/inittab</filename></title>
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1c6890 |
<screen>
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1c6890 |
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1c6890 |
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1c6890 |
# initalization.
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1c6890 |
ACM0:2345:respawn:/sbin/mgetty -D ttyACM0
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1c6890 |
</screen>
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1c6890 |
</sect3>
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73737d |
<sect3 id="connectivity-ppp-server-mgetty-login">
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1c6890 |
<title><filename>/etc/mgetty+sendfax/login.config</filename></title>
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1c6890 |
<screen>
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1c6890 |
# Automatic PPP startup on receipt of LCP configure request (AutoPPP).
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1c6890 |
# mgetty has to be compiled with "-DAUTO_PPP" for this to work.
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1c6890 |
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1c6890 |
# Consult the "pppd" man page to find pppd options that work for you.
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1c6890 |
#
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1c6890 |
# NOTE: for *some* users, the "-detach" option has been necessary,
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1c6890 |
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1c6890 |
# it.
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
#
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
# NOTE2: "debug" creates lots of debugging info. LOOK AT IT if
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1c6890 |
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
#
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
# NOTE3: "man pppd" is your friend!
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
#
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
# NOTE4: max. 9 arguments allowed.
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1c6890 |
#
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1c6890 |
#/AutoPPP/ - a_ppp /usr/sbin/pppd auth -chap +pap login debug
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cc1234 |
/AutoPPP/ - a_ppp /usr/sbin/pppd 192.168.1.1:192.168.1.2
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1c6890 |
</screen>
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1c6890 |
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1c6890 |
<para>
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9846e2 |
In this configuration, we set both local and remote IP
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9846e2 |
addresses to fix the IP information used by computers once the
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9846e2 |
PPP connection has been established. All other options are
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9846e2 |
taken from the <filename>options</filename> file (see
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73737d |
linkend="connectivity-ppp-server-pppd-options" />). If we
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1c6890 |
don't specify both local and remote IP addresses when pppd is
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1c6890 |
initialized, pppd will try to take such information from the
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1c6890 |
first Modem device you configured (e.g., ppp0) and will expect
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1c6890 |
the remote peer to provide its IP address. This situation can
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1c6890 |
introduce some contraditions (e.g., the local and remote
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1c6890 |
address may be on a different network.) that would make the
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1c6890 |
connection to fail.
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1c6890 |
</para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
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1c6890 |
<para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
Another issue we might face out would be the netmask
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1c6890 |
specification of the poin-to-point network established between
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1c6890 |
the two computers. Inside the pppd-2.4.4 man page there is no
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1c6890 |
reference to the <option>netmask</option> option, however,
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1c6890 |
there is a mention to it on the sample files installed with it
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1c6890 |
which is quiet confussing. It seems to be required that one of
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1c6890 |
the two computers establishing connection defines the netmask
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1c6890 |
information of the network they are creating. So, to do it on
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1c6890 |
the server computer (the one receiving calls), it is needed to
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1c6890 |
set the netmask definition in the Modem device configuration
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73737d |
file of it (
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1c6890 |
/>) along with the local IP address. Otherwise, even local and
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1c6890 |
remote IP addresses be specified through the pppd, the
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1c6890 |
connection will end up having the 255.255.255.255 netmask
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1c6890 |
which would let you ping the computer on the other end but
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1c6890 |
that will not last too long before it fails and iptables seems
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1c6890 |
to get very confused about it.
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1c6890 |
</para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
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1c6890 |
<para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
Since we are already using
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1c6890 |
class="daemon">pppd</systemitem> to attend login requests,
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1c6890 |
there is no need to invoke the
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1c6890 |
<application>login</application> program. So, comment the
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1c6890 |
related line as described below.
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1c6890 |
</para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
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1c6890 |
<screen>
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1c6890 |
#* - - /bin/login @
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1c6890 |
</screen>
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1c6890 |
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1c6890 |
</sect3>
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1c6890 |
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73737d |
<sect3 id="connectivity-ppp-server-mgetty-dialin">
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
<title><filename>/etc/mgetty+sendfax/dialin.config</filename></title>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
<para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
I didn't touch this file, but you might need to.
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1c6890 |
</para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
</sect3>
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1c6890 |
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73737d |
<sect3 id="connectivity-ppp-server-mgetty-config">
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1c6890 |
<title><filename>/etc/mgetty+sendfax/mgetty.config</filename></title>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
<para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
I didn't touch this file, but you might need to.
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
</para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
</sect3>
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1c6890 |
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1c6890 |
</sect2>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
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73737d |
<sect2 id="connectivity-ppp-server-pppd">
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
<title><package>pppd</package></title>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
<para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
Taken from pppd man page: — PPP is the protocol used for
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1c6890 |
establishing internet links over dial-up modems, DSL
|
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
connections, and many other types of point-to-point links.
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
The pppd daemon works together with the kernel PPP driver to
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
establish and maintain a PPP link with another system (called
|
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
the peer) and to negotiate Internet Protocol (IP) addresses
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1c6890 |
for each end of the link. Pppd can also authenticate the peer
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
and/or supply authentication information to the peer. PPP can
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
be used with other network protocols besides IP, but such use
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
is becoming increasingly rare —.
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
</para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
<para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
Before using the configuration provided here, it would be
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
2746a1 |
useful for you to read the documentation provided in the
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1c6890 |
<package>ppp</package> package. This will let you to
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
understand what you are configuring.
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
</para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
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73737d |
<sect3 id="connectivity-ppp-server-pppd-options">
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1c6890 |
<title><filename>/etc/pppd/options</filename></title>
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1c6890 |
<screen>
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1c6890 |
# Enables connection debugging facilities. If this option is given,
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1c6890 |
# facility daemon and level debug. This information can be directed
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1c6890 |
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1c6890 |
# syslog.conf(5)).
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1c6890 |
debug
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1c6890 |
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1c6890 |
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1c6890 |
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1c6890 |
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1c6890 |
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1c6890 |
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1c6890 |
auth
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
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1c6890 |
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1c6890 |
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1c6890 |
lock
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
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1c6890 |
# Specify which DNS Servers the incoming Win95 or WinNT Connection
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9846e2 |
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cc1234 |
ms-dns 192.168.1.1
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1c6890 |
# no packets have been received from the peer for n seconds. Normally
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1c6890 |
# echo-reply. This option can be used with the lcp-echo-failure
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1c6890 |
lcp-echo-interval 30
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1c6890 |
# LCP echo-requests are sent without receiving a valid LCP echo-reply.
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1c6890 |
# parameter. This option can be used to enable pppd to terminate
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1c6890 |
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1c6890 |
# hung up) in situations where no hardware modem control lines are
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1c6890 |
# available.
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1c6890 |
lcp-echo-failure 4
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1c6890 |
# Specifies that pppd should disconnect if the link is idle for n
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1c6890 |
# seconds.
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1c6890 |
idle 60
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1c6890 |
# for n seconds.
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1c6890 |
maxconnect 900
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1c6890 |
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1c6890 |
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1c6890 |
noipx
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1c6890 |
</screen>
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1c6890 |
</sect3>
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1c6890 |
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73737d |
<sect3 id="connectivity-ppp-server-pppd-cha">
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1c6890 |
<title><filename>/etc/pppd/cha-secrets</filename></title>
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1c6890 |
<screen>
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1c6890 |
# Secrets for authentication using CHAP
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1c6890 |
# client server secret IP addresses
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1c6890 |
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1c6890 |
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1c6890 |
# `system-config-network' utility.
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1c6890 |
#
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1c6890 |
#
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1c6890 |
#
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1c6890 |
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1c6890 |
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1c6890 |
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1c6890 |
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1c6890 |
# `system-config-network' utility. By default, there is one line to
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1c6890 |
# verify client's identity with authenticating it and one line to let
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1c6890 |
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1c6890 |
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1c6890 |
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1c6890 |
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1c6890 |
# empty client identity (as explained in pppd's man page) in order to
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1c6890 |
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1c6890 |
#
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cc1234 |
"faith" "projects" "mail4u.2k10" "192.168.1.2"
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
cc1234 |
#"" "projects" "" "192.168.1.2"
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1c6890 |
"projects" * "mail4u.2k10"
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1c6890 |
</screen>
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1c6890 |
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1c6890 |
<para>
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1c6890 |
Assuming the hostname of the server computer is
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1c6890 |
<quote>projects</quote>, when a client computer uses the faith
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
username to login on it, the
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
cc1234 |
class="ipaddress">192.168.1.2</systemitem> IP address will be
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
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assigned to that client computer after a successful
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
authentication. This configuration is just for one Modem
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
device attached to the server computer. In case you have more
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
than one Modem device attached to the server computer, it
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
would be necessary to add one username for each Modem device
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
you have, in order to permit the client computers to connect
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
simultaneously. It is not possible to have two or more
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
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computers with the same IP address in the same network.
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
</para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
</sect3>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
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73737d |
<sect3 id="connectivity-ppp-server-pppd-pap">
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
<title><filename>/etc/pppd/pap-secrets</filename></title>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
<para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
This file contains the same information of
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
9846e2 |
<filename>cha-secrets</filename> file does. See
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
73737d |
linkend="connectivity-ppp-server-pppd-cha" />.
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
</para>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
</sect3>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
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1c6890 |
</sect2>
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![](https://seccdn.libravatar.org/avatar/6547be6a776b3f31e43b7f4b6dd82ebcede0f2d11be196e3a70e28760a760a3c?s=16&d=retro) |
1c6890 |
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1c6890 |
</sect1>
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