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cent OS is install inside the virtualbox. virtualbox is inside windows seven 64 bit .
even there is many choice i don't know wich setting/option to use to have cent os in the same network .
my ip on seven is given by ADSL modem gateway ( DhCP 192.168.10.1)
i wanted that when Cent OS boot the IP is for example 192.168.10.4)
my aim is to be able to connect to Cent os web server using firefox under seven.
i wanted that cent os webserver could be see in from outsidee user ( internet user)
thank's for any help

Please read chapter 6 of the User Manual. Then you know what you need to configure for the Guest. To access the VM from outside your network (i.e. the internet), read www.portforward.com for your router configuration.