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DownloadBelow you can download GNS3, a network simulator for making labs or topologies of routers (IOS, JunOS), firewalls (ASA, PIX) and hosts. It is particularly useful for training to Cisco certifications (CCNA, CCNP, CCIP, CCSP, CCVP or CCIE) or Juniper certifications (JNCIA, JNCIS or JNCIE). Thanks to VirtualBox integration, now even system engineers and administrators can take advantage of GNS3 to study Redhat (RHCE, RHCT), Microsoft (MSCE, MSCA), Novell (CLP) and many other vendor certifications.<br/><br/><h3 style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; padding-top: 20px; padding-bottom: 0px; font-family: verdana, arial, sans-serif; font-style: normal; font-variant: normal; margin-top: 10px; margin-bottom: 10px; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;">Windows</h3><p style="font: 13px="13px" /18px verdana, arial, sans-serif; margin: 1em="1em"  0px; padding: 0px; text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; display: block; white-space: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;">New users to GNS3, it is recommended to download the all-in-one package below.</p><ul style="font: 13px="13px" /18px verdana, arial, sans-serif; text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; padding-top: 0px; padding-bottom: 0px; margin-top: 10px; margin-bottom: 10px; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;"><li><a style="'background-position:" 100% 50%; color: rgb(129, 157, 38); padding-right: 13px; font-weight: normal; text-decoration: none; background-image: url("https://www.gns3.net/wp-content/plugins/sem-external-links/external.png"); background-repeat: no-repeat no-repeat;' class="external external_icon" href="http://sourceforge.net/projects/gns-3/files/GNS3/0.8.2/GNS3-0.8.2-all-in-one.exe/download" target="_blank">GNS3 v0.8.2 all-in-one</a><span class="Apple-converted-space"> </span>(installer which includes Dynamips, Qemu/Pemu, Putty, VPCS, WinPCAP and Wireshark)</li><li><a style="'background-position:" 100% 50%; color: rgb(129, 157, 38); padding-right: 13px; font-weight: normal; text-decoration: none; background-image: url("https://www.gns3.net/wp-content/plugins/sem-external-links/external.png"); background-repeat: no-repeat no-repeat;' class="external external_icon" href="http://sourceforge.net/projects/gns-3/files/GNS3/0.8.2/GNS3-0.8.2-Standalone-32-bit.zip/download" target="_blank">GNS3 v0.8.2 standalone 32-bit</a><span class="Apple-converted-space"> </span>(archive that includes Dynamips, Qemu/Pemu, Putty, VPCS)</li><li><a style="'background-position:" 100% 50%; color: rgb(129, 157, 38); padding-right: 13px; font-weight: normal; text-decoration: none; background-image: url("https://www.gns3.net/wp-content/plugins/sem-external-links/external.png"); background-repeat: no-repeat no-repeat;' class="external external_icon" href="http://sourceforge.net/projects/gns-3/files/GNS3/0.8.2/GNS3-0.8.2-Standalone-64-bit.zip/download" target="_blank">GNS3 v0.8.2 standalone 64-bit</a><span class="Apple-converted-space"> </span>(Windows 64-bit only, archive that includes Dynamips, Qemu/Pemu, Putty, VPCS)</li></ul><h3 style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; padding-top: 20px; padding-bottom: 0px; font-family: verdana, arial, sans-serif; font-style: normal; font-variant: normal; margin-top: 10px; margin-bottom: 10px; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;">Mac OS X</h3><ul style="font: 13px="13px" /18px verdana, arial, sans-serif; text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; padding-top: 0px; padding-bottom: 0px; margin-top: 10px; margin-bottom: 10px; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;"><li><a style="'background-position:" 100% 50%; color: rgb(129, 157, 38); padding-right: 13px; font-weight: normal; text-decoration: none; background-image: url("https://www.gns3.net/wp-content/plugins/sem-external-links/external.png"); background-repeat: no-repeat no-repeat;' class="external external_icon" href="http://sourceforge.net/projects/gns-3/files/GNS3/0.8.2/GNS3-0.8.2-intel-OSX-Lion.dmg/download" target="_blank">GNS3 v0.8.2 Lion DMG package</a><span class="Apple-converted-space"> </span>(OSX 10.7 Lion only, includes Dynamips).</li><li><a style="'background-position:" 100% 50%; color: rgb(129, 157, 38); padding-right: 13px; font-weight: normal; text-decoration: none; background-image: url("https://www.gns3.net/wp-content/plugins/sem-external-links/external.png"); background-repeat: no-repeat no-repeat;' class="external external_icon" href="http://sourceforge.net/projects/gns-3/files/GNS3/0.8.2/GNS3-0.8.2-intel-OSX-Snow_Leopard.dmg/download" target="_blank">GNS3 v0.8.2 Snow Leopard DMG package</a><span class="Apple-converted-space"> </span>(OSX 10.6 Snow Leopard only, includes Dynamips).</li></ul><h3 style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; padding-top: 20px; padding-bottom: 0px; font-family: verdana, arial, sans-serif; font-style: normal; font-variant: normal; margin-top: 10px; margin-bottom: 10px; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;">Sources</h3><ul style="font: 13px="13px" /18px verdana, arial, sans-serif; text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; padding-top: 0px; padding-bottom: 0px; margin-top: 10px; margin-bottom: 10px; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;"><li><a style="'background-position:" 100% 50%; color: rgb(129, 157, 38); padding-right: 13px; font-weight: normal; text-decoration: none; background-image: url("https://www.gns3.net/wp-content/plugins/sem-external-links/external.png"); background-repeat: no-repeat no-repeat;' class="external external_icon" href="http://sourceforge.net/projects/gns-3/files/GNS3/0.8.2/GNS3-0.8.2-src.zip/download" target="_blank">GNS3 v0.8.2 zip archive</a></li><li><a style="'background-position:" 100% 50%; color: rgb(129, 157, 38); padding-right: 13px; font-weight: normal; text-decoration: none; background-image: url("https://www.gns3.net/wp-content/plugins/sem-external-links/external.png"); background-repeat: no-repeat no-repeat;' class="external external_icon" href="http://sourceforge.net/projects/gns-3/files/GNS3/0.8.2/GNS3-0.8.2-src.tar.gz/download" target="_blank">GNS3 v0.8.2 tgz archive</a></li><li><a style="'background-position:" 100% 50%; color: rgb(129, 157, 38); padding-right: 13px; font-weight: normal; text-decoration: none; background-image: url("https://www.gns3.net/wp-content/plugins/sem-external-links/external.png"); background-repeat: no-repeat no-repeat;' class="external external_icon" href="http://sourceforge.net/projects/gns-3/files/GNS3/0.8.2/GNS3-0.8.2-src.tar.bz2/download" target="_blank">GNS3 v0.8.2 bz2 archive</a></li></ul>Associated softwaresDynamipsQemu 0.11.0 patched binaries for Windows (32 bits only)Patch for Qemu 0.11.0 to support multicast, udp tunnels, pcap and lcap interfacesQemu 0.13.0 patched 32 bits binary for WindowsPatches for Qemu 0.13.0 to support multicast and UDP tunnelsQemuwrapper 0.7.3 for WindowsQemu &amp; VirtualBox appliancesPemu 2008-03-03 binary for LinuxPemu 2008-03-03 binary for WindowsPemu 2008-03-03 source codeCisco image unpacker 0.1 binary for WindowsCisco image unpacker 0.1 source codeVPCS 0.21a