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</aside>
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</section>
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<section data-transition="slide" data-background="#4d7e65" data-background-transition="convex">
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<h2>Verschlüsselung mit GnuPG</h2>
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</section>
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<section>
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<h3>Geschichte</h3>
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<ul>
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<li class="fragment">1991 - Phil Zimmermann - Pretty Good Privacy ( PGP ).</li>
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<li class="fragment">Exportbeschränkungen der USA verhinderten Internationale Verbreitung</li>
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<li class="fragment">Der Quellcode wurde 1995 als Buch „PGP Source Code and Internals“ exportiert ;-) </li>
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<li class="fragment">1997 - Aufkauf durch McAffee: Quellcode wurde nicht mehr offengelegt</li>
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<li class="fragment">1997 - OpenPGP Standard</li>
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<li class="fragment">1997 - Werner Koch veröffentlicht GnuPG unter der GPL</li>
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</ul>
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</section>
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<section>
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<h3>Funktionsweise</h3>
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<h4>Key Generierung</h4>
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<img src="img/Orange_blue_public_private_keygeneration_de.svg">
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</section>
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<section>
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<h4>Verschlüsselung</h4>
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<img src="img/Orange_blue_public_key_cryptography_de.svg">
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</section>
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<section>
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<h4>Signierung</h4>
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<img src="img/Orange_blue_digital_signature_de.svg">
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</section>
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<section>
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<h4>Verschlüsselung für jmd. Anderen</h4>
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<!-- <img style="margin: 0; max-height: 80vh !important; background: antiquewhite;" src="img/PGP_diagram_de.svg">
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<p style="font-size: .3em">
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Von <a href="//commons.wikimedia.org/w/index.php?title=User:Gregorerhardt&action=edit&redlink=1" class="new" title="User:Gregorerhardt (page does not exist)">Gregorerhardt</a> - <span class="int-own-work" lang="de">Eigenes Werk</span>, <a href="https://creativecommons.org/licenses/by-sa/4.0" title="Creative Commons Attribution-Share Alike 4.0">CC BY-SA 4.0</a>, <a href="https://commons.wikimedia.org/w/index.php?curid=37163956">Link</a>
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-->
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<img src="img/Public_key_encryption.svg">
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</section>
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<section data-transition="slide" data-background="lightblue" data-background-transition="zoom">
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<h2 style="text-shadow: 5px 4px 15px black;">Systemverwaltung</h2>
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</section>
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<section data-transition="slide" data-background="#4d7e65" data-background-transition="convex">
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<h2>Part 8 - Netzwerke</h2>
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</section>
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<section>
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Begriffe:
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<p>
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<table style="font-size: .5em">
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<tr>
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<td>IP = Internet Protocol</td>
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<td>Basis für TCP und UDP</td>
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</tr>
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<tr>
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<td>TCP = Transmission Control Protocol</td>
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<td>Ende-zu-Ende Verbindung zw. 2 Geräten</td>
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</tr>
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<tr>
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<td>UDP = User Datagram Protocol</td>
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<td>minimales, verbindungsloses Netzwerkprotokoll</td>
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</tr>
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<tr>
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<td>ICMP = Internet Control Message Protocol</td>
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<td>Austausch v. IP Status / Fehlern</td>
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</tr>
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<tr>
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<td>PPP = Point-to-Point Protocol</td>
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<td>Verbindung über Wählleitungen, zB ADSL / UMTS / ISDN</td>
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</tr>
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<tr>
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<td>Gateway</td>
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<td>Router über den man ins Internet kommt</td>
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</tr>
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<tr>
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<td>Nameserver</td>
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<td>der für die Adressauflösung zuständige Rechner</td>
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</tr>
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<tr>
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<td>loopback</td>
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<td>lokale Netzwerkschnittstelle zum internen Gebrauch</td>
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</tr>
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</table>
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</section>
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<section>Netzwerke</section>
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<section>
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<h3>IP Adressen</h3>
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</section>
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<section>IP Adressen</section>
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<section>
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<h3>IPv4</h3>
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eine IPv4 Adresse: <br><pre><code>65.142.5.123</code></pre>
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<ul>
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<li class="fragment ">32 bits Länge, 4 x 8 Bit ( 0 - 255 )</li>
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<li class="fragment ">max. 4.294.967.296 Adressen</li>
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</ul>
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</section>
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<section>
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192.168.0.23/24
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<p>
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<table style="font-size: .5em">
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<thead></thead>
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<tbody>
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<section>SSH</section>
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<tr><td class="bl558_sc w65bb">Address</td><td class="bl558_sc w130b">192.168.0.23</td><td class="bl558_sc w160b">11000000.10101000.00000000<span>.00010111</span></td></tr>
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<tr><td class="bl558_sc w65bb">Netmask</td><td class="bl558_sc w130b">255.255.255.0 = 24</td><td>11111111.11111111.11111111<span>.00000000</span></td></tr>
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<tr><td class="bl558_sc w65bb">Wildcard</td><td class="bl558_sc w130b">0.0.0.255</td><td class="bl558_sc w160b">00000000.00000000.00000000<span>.11111111</span></td></tr><tr> </tr>
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</tbody>
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</table>
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</p>
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<hr>
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<p>
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<table style="font-size: .5em">
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<tbody>
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<tr><td class="bl558_sc w65bb">Network</td><td class="bl558_sc w130b">192.168.0.0/24</td><td class="bl558_sc w160b"><b>110</b>00000.10101000.00000000<span>.00000000</span></td></tr>
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<tr><td class="bl558_sc w65bb">Broadcast</td><td class="bl558_sc w130b">192.168.0.255</td><td class="bl558_sc w160b">11000000.10101000.00000000<span>.11111111</span></td></tr>
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<tr><td class="bl558_sc w65bb">First IP</td><td class="bl558_sc w130b">192.168.0.1</td><td class="bl558_sc w160b">11000000.10101000.00000000<span>.00000001</span></td></tr>
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<tr><td class="bl558_sc w65bb">Last IP</td><td class="bl558_sc w130b">192.168.0.254</td><td class="bl558_sc w160b">11000000.10101000.00000000<span>.11111110</span></td></tr>
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<tr><td class="bl558_sc w65bb">Hosts/Net</td><td class="bl558_sc w130b">254</td><td class="bl558_sc w160b">nnnnnnnn.nnnnnnnn.nnnnnnnn<span>.hhhhhhhh</span></td></tr>
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</tbody>
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</table>
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</p>
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</section>
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<section>
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Private IP Bereiche
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<p>
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<table style="font-size: .5em">
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<tbody><tr>
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<th>Adressbereich
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</th>
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<th>Beschreibung
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</th>
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<th>größter <a href="/wiki/Classless_Inter-Domain_Routing" title="Classless Inter-Domain Routing">CIDR</a>-Block
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</th>
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<th>Anzahl IP-Adressen
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</th></tr>
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<tr>
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<td class="hintergrundfarbe9"><b>10.0.0.0–10.255.255.255</b>
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</td>
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<td>privat, 1 <b>8-Bit</b>-Netz
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</td>
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<td>10.0.0.0/8
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</td>
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<td>2<sup>24</sup> = 16.777.216
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</td></tr>
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<tr>
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<td class="hintergrundfarbe9"><b>172.16.0.0–172.31.255.255</b>
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</td>
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<td>privat, 16 <b>16-Bit</b>-Netze
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</td>
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<td>172.16.0.0/12
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</td>
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<td>2<sup>20</sup> = 1.048.576
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</td></tr>
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<tr>
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<td class="hintergrundfarbe9"><b>192.168.0.0–192.168.255.255</b>
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</td>
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<td>privat, 256 <b>24-Bit</b>-Netze
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</td>
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<td>192.168.0.0/16
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</td>
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<td>2<sup>16</sup> = 65.536
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</td></tr>
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<tr>
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<td>169.254.0.0–169.254.255.255
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</td>
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<td>link local, 1 <b>16-Bit</b>-Netz
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</td>
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<td>169.254.0.0/16
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</td>
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<td>2<sup>16</sup> = 65.536
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</td></tr></tbody></table>
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<p><small><a href="https://de.wikipedia.org/wiki/Classless_Inter-Domain_Routing">https://de.wikipedia.org/wiki/Classless_Inter-Domain_Routing</a></small></p>
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</section>
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<section>
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verfügbare ipv4 Adress-Blöcke
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<img style="background:white" src="img/1280px-Ipv4-exhaust.svg.png">
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</section>
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<section>
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<h3>IPv6</h3>
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<div class="fragment">eine IPv6 Adresse
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<pre><code>2002:58bf:13bb:0002:0000:0000:0020:1234 </code></pre>
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</div>
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<ul>
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<li class="fragment ">seit 1998 !</li>
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<li class="fragment ">moderne Betriebssysteme können es alle</li>
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<li class="fragment ">128 bits Länge ( 8 x 4 x 4 Bit )</li>
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<li class="fragment ">Notierung Hexadezimal</li>
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<li class="fragment ">max. 3,4x10^38 (ca 340 Sextillionen) Adressen</li>
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<li class="fragment ">URL Notation: <code>http://[2001:0db8:85a3:08d3::0370:7344]/</code></li>
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</ul>
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</section>
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<section>
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<ul>
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<li class="fragment ">NAT und DHCP sind nicht mehr nötig. In IPv6 ist eine Autokonfiguration eingebaut.</li>
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<li class="fragment ">Der Adressraum genügt auch für alle Toaster</li>
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<li class="fragment ">ipv6 Adressen können für ein Device immer gleich bleiben</li>
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<li class="fragment ">„Privacy Extension“ - Interface identifier wird alle paar Tage gewechselt</li>
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<li class="fragment ">mehrere ipv6 Adressen</li>
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<li class="fragment ">Geräte mit ipv6 sind aus dem Internet erreichbar</li>
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<li class="fragment ">Router hat noch Nutzen als Firewall</li>
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</ul>
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</section>
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<section style="font-size: .6em">
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Führende Nullen innerhalb eines Blockes dürfen ausgelassen werden: <code>2001:0db8:0000:08d3:0000:8a2e:0070:7344</code><br> ist gleichbedeutend mit <br><code>2001:db8:0:8d3:0:8a2e:70:7344</code>
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<p>Mehrere aufeinander folgende Blöcke, deren Wert 0 (bzw. 0000) beträgt, dürfen ausgelassen werden. Dies wird durch zwei aufeinander folgende Doppelpunkte angezeigt:<br><code> 2001:0db8:0:0:0:0:1428:57ab </code><br> ist gleichbedeutend mit <code> <br>2001:db8::1428:57ab</code>.
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</section>
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<section>
|
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Hat z. B. ein Netzwerkgerät die IPv6-Adresse
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<pre><code>2001:0db8:85a3:08d3:1319:8a2e:0370:7347/64</code></pre>
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so lautet das Präfix ( vom Provider zuget. )
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||||
|
||||
<pre><code>2001:0db8:85a3:08d3::/64</code></pre>
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||||
und der Interface-Identifier
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<pre><code>1319:8a2e:0370:7347</code></pre>
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</section>
|
||||
|
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<section>
|
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<h4>speziellle adressen</h4>
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localhost<pre><code>::1/128</code></pre>
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||||
link local <pre><code>fe80::/64</code></pre> ( entspr. 169.254.0.0/16 in ipv4)
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</section>
|
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|
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<section>
|
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<ul>
|
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<li>Netzwerk wird mit Netzwerkmanager konfiguriert</li>
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<li class="fragment ">geht auch im terminal : <pre><code>nmcli -h</code></pre></li>
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</ul>
|
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</section>
|
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|
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<section style="font-size: .6em" >
|
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|
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/etc/NetworkManager/system-connections/Wired connection 1
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<pre><code>[connection]
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id=Wired connection 1
|
||||
uuid=180051c9-6df6-4a96-8d8f-8a0c2eb9050e
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type=ethernet
|
||||
permissions=
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||||
timestamp=1531903725
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|
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[ethernet]
|
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mac-address-blacklist=
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[ipv4]
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dns=192.168.1.4;9.9.9.9;
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dns-search=
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ignore-auto-dns=true
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method=auto
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|
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[ipv6]
|
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addr-gen-mode=eui64
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||||
dns=2a02:8071:4280:ba00:f640:6751:3af0:bb97;2620:fe::10;
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dns-search=
|
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ignore-auto-dns=true
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||||
ip6-privacy=1
|
||||
method=auto
|
||||
</code></pre>
|
||||
</section>
|
||||
|
||||
<section>
|
||||
<section>
|
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<h3>DNS</h3>
|
||||
<h4>Domain Name System</h4>
|
||||
Das Telefonbuch des Internet
|
||||
</section>
|
||||
<section>
|
||||
<ul>
|
||||
<li>geht zurück auf die „hosts“ Datei d. ARPANET</li>
|
||||
<li class="fragment ">händisch gepflegte Liste aller Hosts -> seriously??</li>
|
||||
<li class="fragment ">Einführung des DNS ab 1983</li>
|
||||
<li class="fragment ">übersetzt domain Namen ( www.omikron.net ) in IP Adressen</li>
|
||||
<li class="fragment ">https://de.wikipedia.org/wiki/Domain_Name_System</li>
|
||||
<li class="fragment ">Jeder kann einen DNS Server betreiben ( zb Pi-Hole )</li>
|
||||
</ul>
|
||||
</section>
|
||||
</section>
|
||||
|
||||
<section>
|
||||
<span style="color: orange">Aufgabe:</span> ändert euren voreingestellten DNS Server per network Manager, z.B. <br>
|
||||
<p>google: 8.8.8.8 <br> Quad9: 9.9.9.9 <br> bzw ipv6 Äquivalent
|
||||
</section>
|
||||
|
||||
<section><h2>Manuelle Konfiguration</h2></section>
|
||||
|
||||
<section>
|
||||
/etc/hosts
|
||||
<pre><code class="bash">127.0.0.1 localhost
|
||||
127.0.0.1 dev.local
|
||||
127.0.1.1 workhorse.fcknzs workhorse
|
||||
|
||||
192.168.1.5 pi
|
||||
|
||||
|
||||
# The following lines are desirable for IPv6 capable hosts
|
||||
::1 localhost ip6-localhost ip6-loopback
|
||||
ff02::1 ip6-allnodes
|
||||
ff02::2 ip6-allrouters
|
||||
|
||||
2a01:4f8:191:6204::2 lk.schubertdaniel.de
|
||||
</code></pre>
|
||||
</section>
|
||||
<section>
|
||||
/etc/resolf.conf
|
||||
<pre><code class="bash">#Generated by NetworkManager
|
||||
nameserver 192.168.1.4 #pihole
|
||||
nameserver 9.9.9.9
|
||||
nameserver 2a02:8071:4280:ba00:f640:6751:3af0:bb97 #pi hole
|
||||
|
||||
# NOTE: the libc resolver may not support more than 3 nameservers.
|
||||
# The nameservers listed below may not be recognized.
|
||||
nameserver 2620:fe::10
|
||||
</code></pre>
|
||||
</section>
|
||||
|
||||
<section>
|
||||
/etc/network/interfaces
|
||||
<pre><code class="bash" style="font-size: .7em"># The loopback network interface
|
||||
auto lo
|
||||
iface lo inet loopback
|
||||
|
||||
# dhcp
|
||||
auto eth0
|
||||
allow-hotplug eth0
|
||||
iface eth0 inet dhcp
|
||||
|
||||
iface eth0 inet6 dhcp # stateful
|
||||
iface eth0 inet6 auto # stateless
|
||||
</code></pre>
|
||||
</section>
|
||||
<section>
|
||||
/etc/network/interfaces
|
||||
<pre><code class="bash" style="font-size: .7em"># statische konfiguration
|
||||
auto eth0
|
||||
iface eth0 inet static
|
||||
address 192.0.2.7
|
||||
netmask 255.255.255.0
|
||||
gateway 192.0.2.254
|
||||
|
||||
iface eth0 inet6 static
|
||||
address 2001:db8::c0ca:1eaf
|
||||
netmask 64
|
||||
gateway 2001:db8::1ead:ed:beef
|
||||
|
||||
</code></pre>
|
||||
</section>
|
||||
<section>
|
||||
/etc/hostname
|
||||
<pre><code>laptop</code></pre>
|
||||
|
||||
</section>
|
||||
|
||||
<section>
|
||||
Befehle zur Konfiguration der Netzwerkschnitstelle
|
||||
|
||||
<pre style="font-size: .4em"><code class="bash"># netzwerk geräte anzeigen
|
||||
~$ ip link show
|
||||
|
||||
# ip adressen anzeigen
|
||||
~$ ip addr
|
||||
|
||||
# netzwerk device de-/aktivieren
|
||||
~$ ip link set enp0s7 down
|
||||
~$ ip link set enp0s7 up
|
||||
|
||||
# ip setzen
|
||||
~$ ip addr add 192.168.1.2/24 dev enp0s7
|
||||
|
||||
# route zeigen
|
||||
~$ ip route
|
||||
|
||||
#route ( gateway ) hinzufügen
|
||||
~$ ip route add default via 192.168.1.1
|
||||
</code></pre>
|
||||
</section>
|
||||
|
||||
|
||||
<section>
|
||||
Befehle zur Konfiguration der WLAN-Netzwerkschnitstelle
|
||||
|
||||
<pre style="font-size: .4em"><code class="bash">~$ iw dev wlan0 info
|
||||
~$ iw dev wlan0 link
|
||||
|
||||
~$ iw dev wlan0 scan #...
|
||||
|
||||
~$ iw dev wlan0 connect gastnetz-01
|
||||
~$ dhclient wlan0 # holt dhcp ein
|
||||
|
||||
~$ iw dev wlan0 disconnect
|
||||
|
||||
</code></pre>
|
||||
|
||||
|
||||
</section>
|
||||
|
||||
<section>
|
||||
|
||||
<small>für WPA gesicherte Netzwerke muss wpa_supplicant bemüht werden <br>
|
||||
https://wiki.ubuntuusers.de/WLAN/wpa_supplicant/
|
||||
</small>
|
||||
<p>
|
||||
/etc/network/interfaces
|
||||
<pre><code class="bash" style="font-size: .7em"># statische konfiguration
|
||||
auto wlan0
|
||||
iface wlan0 inet dhcp
|
||||
wpa-conf /etc/wpa.conf</code></pre>
|
||||
/etc/wpa.conf
|
||||
<pre><code class="bash" style="font-size: .55em">network={
|
||||
ssid="Netzwerkname"
|
||||
scan_ssid=1
|
||||
proto=RSN
|
||||
key_mgmt=WPA-PSK
|
||||
pairwise=CCMP
|
||||
group=CCMP
|
||||
psk="meinschluessel"
|
||||
}</code></pre>
|
||||
|
||||
|
||||
</section>
|
||||
|
||||
<section>
|
||||
per Systemd
|
||||
<p>/etc/systemd/network/20-wired.network</p>
|
||||
|
||||
<pre><code>
|
||||
[Match]
|
||||
Name=enp1s0
|
||||
|
||||
[Network]
|
||||
Address=10.1.10.9/24
|
||||
Gateway=10.1.10.1
|
||||
DNS=10.1.10.1
|
||||
#DNS=8.8.8.8</code></pre>
|
||||
</section>
|
||||
|
||||
<section>
|
||||
prüfen ob Device im Netz ist:
|
||||
<pre><code>~$ ping -c 3 192.168.1.2</code></pre>
|
||||
</section>
|
||||
|
||||
<section>
|
||||
Benennung der Netzwerkschnittstelle
|
||||
<pre class="fragment "><code class="plain">wlan0 wlan1 wlan2 ...</code></pre>
|
||||
<pre class="fragment "><code class="plain">eth0 eth1 eth2 .. </code></pre>
|
||||
aktuelle Distributionen verw.
|
||||
<pre class="fragment "><code class="plain">eno1 eno2 eno3 ...</code></pre>
|
||||
<pre class="fragment "><code class="plain">ens1 ens2 ens3 ...</code></pre>
|
||||
<pre class="fragment "><code class="plain">enp1s2 enp2s4 enp1s7 ...</code></pre>
|
||||
<pre class="fragment "><code class="plain">wlp1s2 wlp2s8...</code></pre>
|
||||
</section>
|
||||
|
||||
|
||||
</div>
|
||||
</div>
|
||||
|
||||
2
gpg.html
2
gpg.html
@ -188,7 +188,7 @@ gpg -K
|
||||
|
||||
<section>
|
||||
<span style="color: orange">Aufgabe:</span><p> Tauscht eure öffentlichen Schlüssel; <br>Sendet euch verschlüsselte Emails; <br>signiert gegenseitig eure Schlüssel; <br>Verschlüsselt eine Datei mit gpg.<br>
|
||||
Sucht meinen Schlüssel und sendet mir verschlüsselte emails ;-)
|
||||
Sucht meinen Schlüssel und sendet mir verschlüsselte emails ;-)<br> mail@schubertdaniel.de
|
||||
</section>
|
||||
|
||||
|
||||
|
||||
BIN
img/1280px-Ipv4-exhaust.svg.png
Normal file
BIN
img/1280px-Ipv4-exhaust.svg.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 76 KiB |
@ -26,6 +26,8 @@
|
||||
<li><a href="8.html">Systemd</a></li>
|
||||
<li><a href="9.html">Dateisysteme</a></li>
|
||||
<li><a href="gpg.html">GnuPG</a></li>
|
||||
<li><a href="10.html">Netzwerke 1</a></li>
|
||||
|
||||
</ol>
|
||||
|
||||
<div class="ui left aligned padded grid">
|
||||
@ -84,6 +86,9 @@
|
||||
<h3>systemd</h3>
|
||||
<li><a href="https://wiki.archlinux.org/index.php/Systemd" target="_blank">Arch Wiki - Systemd</a></li>
|
||||
<li><a href="https://wiki.debian.org/systemd" >Debian.org - Systemd</a></li>
|
||||
<h3>Netzwerk Einstellungen</h3>
|
||||
<li><a href="https://wiki.debian.org/NetworkConfiguration#Setting_up_an_Ethernet_Interface">https://wiki.debian.org/NetworkConfiguration</a></li>
|
||||
<li><a href="https://wiki.ubuntuusers.de/interfaces/">wikiw.ubuntuusers.de</a></li>
|
||||
<h3>diverse</h3>
|
||||
<li><a href="ftp://ftp.gwdg.de/pub/linux/knoppix/dvd/">Knoppix</a></li>
|
||||
<li><a href="https://wiki.archlinux.de/title/Image-Erstellung_mit_dd">Nutzung von <code>dd</code> </a></li>
|
||||
|
||||
Loading…
Reference in New Issue
Block a user