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206-unable to create linux raw or generic ethernet

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eof

Post subject: 206-unable to create linux raw or generic ethernet

Posted: Sat Jun 21, 2014 7:32 am

Joined: Sat Jun 21, 2014 5:10 am
Posts: 2

Hi there,

Some info on my setup:
- GNS3 0.86/also tried 0.84
- Debian Testing x64
- dynamips 0.2.12-amd64/also tried 0.28-RC3

What have I tried:
* give root permissions to dynamips.

Code:

-rwsr-xr-x 1 root root 857904 Apr 17 23:32 dynamips

Code:

zarek:GNS3$ ps -jef | grep dynamips
root     14370 14207 14204 14204  0 09:06 ?        00:00:00 dynamips -H 127.0.0.1:7200

* start gns3 with gksu prefix so that it also runs with root privileges

Code:

zarek    14203     1  3168  3168  0 08:50 ?        00:00:00 gksu gns3-old
root     14204 14203 14204 14204  0 08:50 ?        00:00:00 /usr/bin/sudo -H -S -p GNOME_SUDO_PASS -u root -- gns3-old
root     14207 14204 14204 14204  0 08:50 ?        00:00:04 /usr/bin/python /usr/bin/gns3-old

This issue is also present on GNS3 1.0

Code:

[I 140621 11:13:35 router:1298] router "R1" [id=1]: adapter NM-16ESW inserted into slot 1
[I 140621 11:13:55 ethernet_switch:57] Ethernet switch "SW1" [id=1] has been created
[I 140621 11:14:14 nio_udp_auto:58] NIO UDP AUTO nio_udp_auto0 created with laddr=0.0.0.0, lport_start=10001, lport_end=20000
[I 140621 11:14:14 __init__:415] R1 [id=1] has allocated UDP port 10001 with host 0.0.0.0
[I 140621 11:14:14 nio_udp_auto:58] NIO UDP AUTO nio_udp_auto1 created with laddr=0.0.0.0, lport_start=10001, lport_end=20000
[I 140621 11:14:14 __init__:415] SW1 [id=1] has allocated UDP port 10002 with host 0.0.0.0
[I 140621 11:14:14 nio_udp_auto:126] NIO UDP AUTO nio_udp_auto0 connected to 127.0.0.1:10002
[I 140621 11:14:14 router:1466] router "R1" [id=1]: NIO nio_udp_auto0 bound to port 1/10
[I 140621 11:14:14 nio_udp_auto:126] NIO UDP AUTO nio_udp_auto1 connected to 127.0.0.1:10001
[I 140621 11:14:14 ethernet_switch:177] Ethernet switch "SW1" [id=1]: NIO nio_udp_auto1 bound to port 1
[I 140621 11:14:14 ethernet_switch:227] Ethernet switch "SW1" [id=1]: port 1 set as an access port in VLAN 1
[I 140621 11:14:21 jsonrpc_websocket:161] calling built-in method builtin.interfaces
[I 140621 11:14:37 base:213] ZeroMQ client (dynamips) sending JSON-RPC custom error: unable to create generic ethernet NIO for call id 34e14aca-0c49-4a0f-95f6-cde0a8d381c2
[I 140621 11:15:02 base:213] ZeroMQ client (dynamips) sending JSON-RPC custom error: unable to create generic ethernet NIO for call id 8450ae39-5434-421a-af88-09d48d165be9

Please share any ideas. I am so stuck on this one :(

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grossmj

Post subject: Re: 206-unable to create linux raw or generic ethernet

Posted: Sat Jun 21, 2014 12:57 pm

Site Admin

Joined: Sat Oct 11, 2008 1:41 pm
Posts: 2668
Location: Canada

Hi,

Try to set the capture capability on Dynamips: post19569.html#p19569

_________________
Jeremy, GNS3 Programmer & Benevolent Dictator for Life.

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eof

Post subject: Re: 206-unable to create linux raw or generic ethernet

Posted: Sat Jun 21, 2014 10:17 pm

Joined: Sat Jun 21, 2014 5:10 am
Posts: 2

grossmj wrote:

Hi,

Try to set the capture capability on Dynamips: post19569.html#p19569

Thanks for the idea. Here's what I did:

Code:

root /usr/bin # apt-get install libcap2-bin
libcap2-bin is already the newest version.

root /usr/bin # chmod 755 dynamips 
root /usr/bin # chown root.root dynamips 
root /usr/bin # setcap cap_net_raw,cap_net_admin+eip dynamips
root /usr/bin # getcap dynamips 
dynamips = cap_net_admin,cap_net_raw+eip

The issue is that it did not work.
Any log files that dynamips writes will not be granted to write to the current directory (/usr/bin) which does not have write permissions for normal users. See also http://forum.gns3.net/post7234.html#p7234.
So I added this:

Code:

cap_dac_override,cap_net_admin,cap_net_raw+eip

What cap_dac_override does is:
Bypass file read, write, and execute permission checks. (DAC is an abbreviation of "discretionary access control".)
Without write permissions I got theese error messages:

Quote:

Unable to create lock file "c7200_i0_lock".
VM default: unable to create instance!
c7200: unable to create instance default!

But I still receive the error.

Later edit:
Found my error.
When adding interfaces to the cloud in Linux make sure not to add it like this:
nio_gen_eth lo100
in Linux subinterface indexes are separated by a colon (:) between the name of the interface and it's index:
nio_gen_eth lo:100
The only settings I will keep is:

Code:

cap_dac_override,cap_net_admin,cap_net_raw+eip

That way, the dynamips binary has the proper permissions.
and just let the default file permissions as is:

Code:

root /usr/bin # stat dynamips 
  File: ‘dynamips’
Access: (0755/-rwxr-xr-x)  Uid: (    0/    root)   Gid: (    0/    root)

After doing that I added two interfaces (one tap0 and one lo:101):

Then at the terminal I had to make then:
Note: For installing tap devices I used this guide.

Code:

ifconfig tap0 10.100.100.100 netmask 255.255.255.0 up
ifconfig lo:101 10.100.100.101 netmask 255.255.255.0 up

Then I started the router and configured the e0/0 interface with the ip address 10.100.100.101, and after the no shut command.
Ping worked.

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