2 domian on same vbulletin forum

[imnothacker]

Hello i wanna know HOW to run 2 domain on same vbulletin
example
site1.com
site2.com

mirror website

if anyone open site1 or site2 it should be same , if anyone register or post anything on site1 it shluld also be same as site2

in short 2 domains with same database

 

[gozmit]

If everything is same then why don't you setup a 301 redirect to original domain?