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637.
The purpose of IP Masquerading is to allow machines with private, non-routable IP addresses on your network to access the Internet through the machine doing the masquerading. Traffic from your private network destined for the Internet must be manipulated for replies to be routable back to the machine that made the request. To do this, the kernel must modify the <emphasis>source</emphasis> IP address of each packet so that replies will be routed back to it, rather than to the private IP address that made the request, which is impossible over the Internet. Linux uses <emphasis>Connection Tracking</emphasis> (conntrack) to keep track of which connections belong to which machines and reroute each return packet accordingly. Traffic leaving your private network is thus "masqueraded" as having originated from your Ubuntu gateway machine. This process is referred to in Microsoft documentation as Internet Connection Sharing.
Le but du masquage IP (forme de translation d'adresses) est de permettre à des machines d'un réseau doté d'adresses IP privées non routables d'accéder à l'Internet en passant par une autre machine effectuant la translation. Le trafic sortant du réseau privé pour aller vers Internet doit être manipulé pour que les réponses puissent être acheminées vers la machine qui a fait la requête correspondante. Pour cela, le noyau doit modifier l'adresse IP <emphasis>source</emphasis> de chaque paquet pour que les réponses lui soient renvoyées à lui plutôt qu'à l'adresse privée qui a fait la requête, ce qui est impossible sur l'Internet. Linux utilise <emphasis>Connection Tracking</emphasis> (conntrack) pour savoir à chaque instant quelle connexion appartient à quelle machine, et re-router ensuite les paquets vers la bonne machine. Le trafic sortant du réseau privé apparaît donc «[nbsp]masqué[nbsp]», comme s'il provenait de la passerelle Ubuntu. Ce procédé est appelé «[nbsp]Partage de connexion Internet[nbsp]» dans la documentation de Microsoft.
Translated and reviewed by Bruno
Located in serverguide/C/security.xml:597(para)
638.
ufw Masquerading
Masquage IP avec ufw
Translated and reviewed by Bruno
Located in serverguide/C/security.xml:613(title)
639.
IP Masquerading can be achieved using custom <application>ufw</application> rules. This is possible because the current back-end for <application>ufw</application> is <application>iptables-restore</application> with the rules files located in <filename>/etc/ufw/*.rules</filename>. These files are a great place to add legacy iptables rules used without <application>ufw</application>, and rules that are more network gateway or bridge related.
Le masquage IP peut être accompli en utilisant des règles <application>ufw</application> spécifiques. Ceci est possible car <application>ufw</application> se base actuellement sur <application>iptables-restore</application> avec des fichiers de règles situés dans <filename>/etc/ufw/*.rules</filename>. Ces fichiers sont le meilleur endroit pour ajouter des anciennes règles iptables sans passer par <application>ufw</application>, ainsi que des règles qui touchent au routage et aux ponts réseau.
Translated and reviewed by Bruno
Located in serverguide/C/security.xml:614(para)
640.
The rules are split into two different files, rules that should be executed before <application>ufw</application> command line rules, and rules that are executed after <application>ufw</application> command line rules.
Les règles sont scindées en deux fichiers différents, celles qui doivent être exécutées avant les règles en ligne de commande de <application>ufw</application> et celles qui doivent être exécutées après les règles en ligne de commande de <application>ufw</application>.
Translated and reviewed by Bruno
Located in serverguide/C/security.xml:620(para)
641.
First, packet forwarding needs to be enabled in <application>ufw</application>. Two configuration files will need to be adjusted, in <filename>/etc/default/ufw</filename> change the <emphasis>DEFAULT_FORWARD_POLICY</emphasis> to <quote>ACCEPT</quote>:
Tout d'abord, la retransmission (forwarding) des paquets doit être activée dans <application>ufw</application>. Deux fichiers de configuration doivent être modifiés. Dans <filename>/etc/default/ufw</filename> ajustez la valeur de <emphasis>DEFAULT_FORWARD_POLICY</emphasis> à <quote>ACCEPT</quote>[nbsp]:
Translated and reviewed by Bruno
Located in serverguide/C/security.xml:626(para)
642.

DEFAULT_FORWARD_POLICY="ACCEPT"
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DEFAULT_FORWARD_POLICY="ACCEPT"
Translated and reviewed by seb35690
Located in serverguide/C/security.xml:630(programlisting)
643.
Then edit <filename>/etc/ufw/sysctl.conf</filename> and uncomment:
Modifiez ensuite <filename>/etc/ufw/sysctl.conf</filename> et décommentez[nbsp]:
Translated and reviewed by Bruno
Located in serverguide/C/security.xml:633(para)
644.

net.ipv4.ip_forward=1
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net.ipv4.ip_forward=1
Translated and reviewed by seb35690
Located in serverguide/C/security.xml:714(programlisting)
645.
Similarly, for IPv6 forwarding uncomment:
De manière similaire, pour IPV6 décommentez[nbsp]:
Translated and reviewed by Bruno
Located in serverguide/C/security.xml:639(para)
646.

net.ipv6.conf.default.forwarding=1
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net.ipv6.conf.default.forwarding=1
Translated and reviewed by seb35690
Located in serverguide/C/security.xml:720(programlisting)
637646 of 2030 results

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Contributors to this translation: 65GYgzf, Alain Lebret, Alban CLERGEOT, AlbinOz, Alexandre Franke, Alexandre Imache, Anis CHEBBI, Arnaud Soyez, Aurélien Luciani, Bertrand JUGLAS, Bruno, CarZ, Christophe Painchaud, Claude Paroz, Colin GILLE, Coster David, DI RUSCIO Fernand, Damien Deroussen, Damien H, David Bertho, Denis Bisaro, Denis Choveaux, Didier Roche-Tolomelli, Donk, Emmanuel Sunyer, Etienne Malandain, Fabián Rodríguez, Fabrice Coutadeur, Florian Neyret, Frank Bob, Fred Saunier, Ghimli, Gilles Accad, Gougnaf, GroNox, Guillaume Damiens, Gwi, Huygens, James Dupin, Jean Champémont, Jean-Luc Villoué, Jean-Philippe, Jerome CK, Joanna Tordjeman, Jonathan Clarke, Jérémie Corbier, KHALIFA Yanis, Knah Tsaeb, Laurent RICHARD, Lionel Porcheron, Loic Treyvaud, Louis DEMAY, ManuPeng, Marc Auer, Mathieu Goeminne, Mathieu Trudel-Lapierre, Matthieu CHAUVEAU, Michel, Mika, NSV, Nebaff, Nicolas Borboën, Nicolas DERIVE, Nicolas Michel, Nicolas Réau, Olivier, Onra, Pascal, Pascal Corpet, Pascal Havet, Paul Darby, Philippe Piquer, Pierre Buard, Pierre Slamich, Pierrick Vandenbroucke, Psykocrash, Rafik Elouerchefani, Removed by request, Rodolphe Ortalo, Stéphane V, Surfoo, Sylvain Doctrinal, Sylvain Lasnier, Sébastien GRIPON, T0m-S, TaZmaniak, Valentin Rocher, Vincent Esposito, Vincent Labreche, Will Hunting, X, Xavier Verne, Yann Dìnendal, Yves MATHIEU, baptiste, blob, bruno, ivan, kos!, lann, madden, olivier perrin, pouchat, prunier charly, sam101, seb35690, sun-wukong, thebachman, tomestla, vouzico.