Linux系统，gns3中连接cloud 或者vpc 到路由器的时候，会报错unable to create generic linux nio
解决办法：
一. kdesu(gnome应该是用gksu吧) gns3 以root启动gns3。但是我不喜欢以root身份去运行，并且这样启动后gns3的gtk界面很难看
二. 转自：http://7200emu.hacki.at/viewtopic.php?t=6134&sid=8b8708b3e62f71fcfb7f7e104ac2759d
1. Set owner and group of dynamips binary as root and wheel:
$ sudo chown root:wheel dynamips-0.2.8-RC2-OSX-Leopard.intel.bin
2. Set setuid and setgid bits accordingly:
$ sudo chmod 6755 dynamips-0.2.8-RC2-OSX-Leopard.intel.bin
3. Check the result:
$ ls -la dynamips-0.2.8-RC2-OSX-Leopard.intel.bin
-rwsr-sr-x 1 root wheel 815568 Dec 1 2007 dynamips-0.2.8-RC2-OSX-Leopard.intel.bin
4. Start GNS3 and open a network file. Check that Dynamips is run as root:
$ ps -jef | grep dynamips
root 363 328 328 31ad998 1 S ?? 0:08.61 /Applications/GNS3.app/Contents/Resources/dynamips-0.2.8-RC2-OSX 0 0 0:05.89 ??