I need some help with a BM 3.7 installation another consultant have done at
a customer, the server is NW 5.1 SP4.

It looks like he had the public interface as the first as that IP is the
only one in the hosts-file and the only one you can surf to the webserver
(Netscape Enterprise Server) to. They are running GW Webaccess on this
server and they are connecting from both the inside and the outside.

Is there a simple way to solve this is or should I let it be as it is?

There seems to be some problems with the filters also, but that I will ask
about in the filters-section.