Tap driver and loopback
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Author:  rgarcia1801 [ Tue Nov 02, 2010 1:00 am ]
Post subject:  Tap driver and loopback


I am not a mac os x expert and I need to fix the issues I am having with the tap drivers. I can see the tap devices when I do ls /dev but when I try to configure it using sudo ifconfig tap0 x.x.x.x netmask x.x.x.x it says that it doesn't exist.

There are many posts out there but for other platforms. If you have the answer or a link to a black and white answer to resolve this problem, pls post it here.

Your help is very much appreciated. Thank you.

Author:  ScotchBritt [ Mon Nov 15, 2010 1:34 am ]
Post subject:  Re: Tap driver and loopback

Hey there, i am having exactly the same problem i will post here what i did to get where i am at, for installation i follow this post:

So, what i did is i installed GNS3 and dynamips(installed dynagen and am using dynamips from /Application/Dynagen/) i had some troubles at beggining with dynamips, because it wasn’t inside GNS3 .dmg, dont know why, but now, i have it working alright, i have everything set up, and working, i installed tuntaposx correctly and i can see the tap0-15 tun0-15(i followed this post ) when i ls /dev, so all seems ok, but when i try to open the .net with the confs you have it gives this error on dynamips:

netio_tap_create: unable to open TAP device dev/tap0 (No such file or directory)

in gns3:
206-unable to create TAO NIO

my .net is:

autostart = False
workingdir = /Users/”usr”/Documents/GNS3/Projectos/SvM/Lab7/Lab7_working
udp = 10000
image = /Applications/Dynagen/IOS/c2600-advipservicesk9-mz.124-19.bin
ram = 128
idlepc = 0x81fa91bc
sparsemem = True
ghostios = True
chassis = 2621
model = 2621
console = 2000
x = -107.0
y = -58.0
f0/0 = NIO_tap:dev/tap0
configs = Lab7_configs
workdir = Lab7_working
[[Cloud C1]]
x = -360.5
y = -69.0
connections = R1:f0/0:NIO_tap:/dev/tap0

i am running dynamips and gns3 has root user(checked with mac activity monitor), i dont know what else to do, but if i dont get any solution in next 2 days, i think i will try to uninstall all and reinstall, cause i have alot to work on and i cant… =/ Need to study for school&CCNA, i am loving GNS3, great APP :) Ty all for atention. Wilson[]

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