Clients IP instead of mine login in to wpadmin

Hi!

I wonder if following is possible to do, and how to do it.

I have a place at a server (myplace.com) there I have a couple of WP installed, and different IP-adresses (otherplace.com, anotherplace.com etc) linked to the different WPs folders.
If I want to login to wp-admin at one of the places, let say otherplace.com, I must use myplace.com/otherplacefolder/wp-admin to login. But I want to use otherplace.com/wp-admin to login, doing so dont work for me, is it possible to fix that?

Any help to fix or point in direction to help is apreciated.

Regard
Tompad