How to set global ip in lan

hi guys.
I am new to cisco .i have some basic question to ask.
in my situation .i use a cisco 1841 .
ethernet 0/0 .i set serval vlan in this port .with the address 10.x.x.x /24
ethernet 0/1 .i set a global ip in it .with address of 219.x.x.x .and i have another global ip preserved .
the nat is ethernet 0/0 ----> ethernet 0/1 .
and my question is: how to create DMZ .i want to set another global ip in my Lan.
how can i do this setting.
any suggetsion?

Thanks a lot .
it work well for me now .
i have a another question.
i set the nat to gloable ip .and it works.i set it by the Cisco Configuration Professional
in the edit the static nat.
but there is a abnormal .
when the electronic is down. the setting change to the old one.
so what is the problem?

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