<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1457006881739_4253">Hi,</div><div id="yui_3_16_0_1_1457006881739_4315"><br></div><div dir="ltr" id="yui_3_16_0_1_1457006881739_4283">I am running ubuntu 14.04.4 64 bit and lxd (2.0.0.beta4) from ppa.</div><div id="yui_3_16_0_1_1457006881739_4445" dir="ltr">The kernel version is : Linux N5110 3.19.0-51-generic #58~14.04.1-Ubuntu SMP Fri Feb 26 22:02:58 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux<br></div><div id="yui_3_16_0_1_1457006881739_4330" dir="ltr">I created a trusty tahr amd64 container and installed unetlab on it.</div><div id="yui_3_16_0_1_1457006881739_4363" dir="ltr">Here is an extract from unetlab's log file when I start a node on a network topology:</div><div id="yui_3_16_0_1_1457006881739_4443" dir="ltr"><br></div><div id="yui_3_16_0_1_1457006881739_4422" dir="ltr">sh: 1: cannot create /sys/class/net/vnet0_4/bridge/group_fwd_mask: Permission denied<br>Mar 03 13:17:34 ERROR: Failed to set group_fwd_mask on bridge (80028).<br></div><div id="yui_3_16_0_1_1457006881739_4328" dir="ltr"><br></div><div id="yui_3_16_0_1_1457006881739_4472" dir="ltr">There's no way I can change the permission of the group_fwd_mask file.</div><div id="yui_3_16_0_1_1457006881739_4523" dir="ltr">And you can tell me to use unetlab's kernel, but the problem is my laptop uses the F** Nvidia optimus and the driver wouldn't compile on unetlab's kernel.</div><div id="yui_3_16_0_1_1457006881739_4557" dir="ltr"><br></div><div id="yui_3_16_0_1_1457006881739_4558" dir="ltr">I have only used lxd/lxc for less than a week so I don't know what to do.</div><div id="yui_3_16_0_1_1457006881739_4566" dir="ltr"><br></div><div id="yui_3_16_0_1_1457006881739_4567" dir="ltr">Thank you a lot.<br></div><div id="yui_3_16_0_1_1457006881739_4524" dir="ltr"><br></div><div id="yui_3_16_0_1_1457006881739_4548" dir="ltr"><br></div><div id="yui_3_16_0_1_1457006881739_4306" dir="ltr"><br></div></div></body></html>