GNS3 on Gentoo Linux

Install and Configure GNS3

First, You should install gns3:

sudo emerge --autounmask-write gns3
sudo dispatch-conf
sudo emerge gns3

Then you need to prepare for ios images, You can download them from:

ftp://ftp.unikon-ua.net/pub/Cisco/IOS/
http://115.com/file/clsclmjb

Then you should configure them:

Edit>IOS Images and Hypervisors

And calculate 'Idle PC'。

You may want to get rid of warning of baseconfig.txt, refer to:

http://forum.gns3.net/post12717.html

If you are using KDE, you may use konsole's preconfigured terminal commands.

Edit>Preferences>General>Terminal Settings

You need to install and configure virtualbox at Edit>Preferences>VirtualBox:

modify Path to vboxwrapper to:

/usr/libexec/gns3/vboxwrapper.py
emerge virtualbox with sdk and python USE flags
install vboxapi:

cd usr/lib/virtualbox/sdk/installer export VBOX\_INSTALL\_PATH=/usr/lib/virtualbox/ python vboxapisetup.py install
install xdotool(It's quite an interesting tool!) sudo emerge xdotool
add virtual system: Edit>Preferences>VirtualBox>VirtualBox Guest

You need to install qemu at Edit>Preferences>Qemu:

modify Path to qemu:

qemu-system-x86\₆₄
modify path to qemuwrapper to:

/usr/libexec/gns3/qemuwrapper.py
kernel should support kvm-intel:

⮀ ~ ⮀ lsmod|grep kvm kvm\_intel 117933 0 kvm 225670 1 kvm\_intel
and add you user to:

gpasswd -a username kvm
add virtual system, which can be vdi
If you want to use PIX firewall, download pemu from Sourceforge and cp them to the directory which has qemuwrapper.py. You can reffer to: http://www.gns3.net/documentation/gns3/pix-firewall-emulation/
if you re-compile kernel, don't forget to re-compile kernel modules for virtualbox and modprobe them

More configuration and downloads(I tried and failed, do not know what is actually is and how to use it):

configure the router with the help of OSPF configure(中文)

A better choice to learn without these configuration, try GNS3 WorkBench