How to run dd-wrt on VirtualBox

Go to dd-wrt's official website:
http://www.dd-wrt.com/site/support/router-database

search for "x86" in the input box.

Download dd-wrt for x86 platform:
DD-WRT X86 Public Vga: Console image

Convert the downloaded image file to virtualbox image:
cmd> "C:\Program Files\Oracle\VirtualBox\vboxmanage.exe" convertdd dd-wrt_public_vga.image dd-wrt.vdi

Create a new virtual machine on VirtualBox:
Opearting System: Linux
Version: Other Linux

Use existing virtual disk: dd-wrt.vdi

VirtualBox Network Setting:
Attached to: Host-only Adapter

Go to File > Preferences > Network > Select "VirtualBox Host-Only Ethernet Adapter" > Edit:
IPv4 Address: 192.168.1.254
IPv4 Network Mask: 255.255.255.0

default password is:
username: root
password: admin

or admin/admin