{"id":153,"date":"2011-09-29T02:10:32","date_gmt":"2011-09-28T20:40:32","guid":{"rendered":"http:\/\/askadmin.com\/?p=153"},"modified":"2012-03-10T21:58:31","modified_gmt":"2012-03-10T16:28:31","slug":"virtual-box-and-virtual-interfaces-on-mac-os-x-loop-back-interfaces","status":"publish","type":"post","link":"https:\/\/askadmin.com\/aa\/virtual-box-and-virtual-interfaces-on-mac-os-x-loop-back-interfaces\/","title":{"rendered":"Virtual Box and Virtual interfaces on mac os X ( loop back interfaces)"},"content":{"rendered":"

GNS3 on mac osx\u00a0 – connecting gns3 lab to internet on mac osx – loopback interfaces on mac osx<\/p>\n

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When working with some applications we may need loop back interfaces.( I needed for GNS3 ,on which I could connect my gns3 lab routers to external world (internet) or vmware \/virtual box guests on my system.<\/p>\n

It is very easy to add a loop back interface on windows. But on macintosh it may appear difficult to get it work.<\/p>\n

I am quite familiar with mac os and I consider myself an advanced mac user\u00a0 ,but\u00a0 still it took 2 days for me to make gns3 work on macbook with all the features -not less than any of windows gns3 version.\u00a0 I will breifly write here how I did it.<\/p>\n

Though I have dual boot ( windows and mac osx using bootcamp)on my macbok\u00a0 , I wanted to completeley eliminate the need of running windows for my exam preparation . So i had 3 challanges<\/p>\n

1. Running GNS3 on mac osx with the tabbed connections terminal like how we use secure crt on windows ( see my post about tabbed connections with the combination of GNS3&secureCRT on windows<\/a>).<\/p>\n

2.Connecting lab routers to internet or vmware\/virtual box guests\u00a0 on mac osx..<\/p>\n

3. Running\u00a0 .vce files on mac\u00a0 os x ( vce file can be opened with visual cert exam suite which runs only on windows)<\/p>\n

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1.On the first day ,I downloaded and installed gns3 ( which, gns3 developers say it is experimental package on mac osx)\u00a0 on macbook on which i was running mac osx 10.5.8\u00a0\u00a0 . After installation when i click on gns3 app\u00a0 It just stayed without any response. I searched gns3 forums and found many people are having same issue with mac osx 10.5 .<\/p>\n

Then i gave a try with mac osx 10.6 on my mac book and it worked well\u00a0 ,but only thing i needed to do was , changing the directory&configuration paths for net files which are copied from windows environment.<\/p>\n

Then I wasted quite some time\u00a0 with secure CRT on mac osx to make it work for gns labs with tabbed connections , until I found that iTerm can also be used for the tabbed connections. I even changed the look of iTerm\u00a0 with a downloaded\u00a0 iTerm profile theme ( download iterm here<\/a>)<\/p>\n

2.I downloaded and installed virtualbox 4.1.2\u00a0 for my mac osx from here .<\/a><\/p>\n

Then I wanted to have tap interfaces ( virtual interfaces on my mac) . For this, I downloaded tuntap <\/a>which comes with tunnel&tap interfaces. But at first time it returned an error saying ” ifconfig : interface tap0 does not exist<\/span> ”\u00a0 when i typed in\u00a0 ifconfig tap0 10.0.0.200 up<\/span><\/em><\/p>\n

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Then I opened the gns3 project net file and added the line\u00a0f0\/0 = NIO_TAP:\/dev\/tap0<\/span><\/em> so my net filed looked like ,<\/p>\n

[[ROUTER R1]]
\nmodel = 2691
\nconsole = 2000
\nx = -119.0
\ny = -104.0
\nf0\/0 = NIO_tap:\/dev\/tap0<\/p>\n

and then I made dynamips\u00a0 to run with root permissions with this command<\/p>\n

#sudo chown root:wheel \/Applications\/GNS3.app\/Contents\/Resources\/dynamips-0.2.8-RC2-OSX-Leopard.intel.bindynamips-0.2.8-RC2-OSX-Leopard.intel.bin<\/em><\/span><\/p>\n

( Assuming I have GNS3 app in applications directory and i am running 32bit , if it was 64 bit I could replace dynamips-0.2.8-RC2-OSX-Leopard.intel.bindynamips-0.2.8-RC2-OSX-Leopard.intel.bin with dynamips-0.2.8-RC3-community-OSX.intel64.bin)<\/em><\/p>\n

But this time GNS3 thrown an error message saying “206-unable to create TAP NIO<\/span>“<\/em>\u00a0 .<\/p>\n

Finally I understood that 206-unable to create TAP NIO error\u00a0 is due to file permissions on \/dev\/tap and \/dev\/tun devices and I typed the commands which made my day .<\/p>\n

#chmod 666 \/dev\/tap*\u2028<\/span><\/em><\/p>\n

#chmod 666 \/dev\/tun*<\/span><\/em><\/p>\n

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Below\u00a0 is\u00a0 My gns3 test router which connected to loop-back interface.<\/p>\n

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3.To run vce files , I downloaded and installed crossover for macosx which allows to run windows applications from mac desktop itself, means no need to run parallel or vmware to run windows applications.<\/p>\n

The problem is crossover is not free , If you can spare some time and take it as challenge then try wine\u00a0 <\/a>which is free and many people say difficult to install ( Hope I will be writing how to install wine on Macintosh in my next post !).<\/p>\n

crossover ( free version is wine) is a kind of emulator , but run cross-platform applications( windows,macintosh,linux) natively without the need of having\u00a0 actual OS ( on vmware we should have installation disk to install os first).<\/p>\n

I created a bottle and installed internet explorer,visual cert exam suite on mac osx\u00a0 .<\/p>\n

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GNS3 on mac osx\u00a0 – connecting gns3 lab to internet on mac osx – loopback interfaces on mac osx ———————————————————————————————————————————————————   When working with some applications we may need loop back interfaces.( I needed for GNS3 ,on which I could connect my gns3 lab routers to external world (internet) or […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false},"categories":[10],"tags":[30,12,26,27,29,28,25,24,11,132,22,23,14,13],"yoast_head":"\nVirtual Box and Virtual interfaces on mac os X ( loop back interfaces) - Ask Admin - A Lifelong Learner<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/askadmin.com\/aa\/virtual-box-and-virtual-interfaces-on-mac-os-x-loop-back-interfaces\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Virtual Box and Virtual interfaces on mac os X ( loop back interfaces) - 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