Hi,
In both database servers, you must have installed the client "informix connect, informix setnet32", it has one tab to configure your server information, first informix server: ol_<machinename>, 2nd. host name: <machinename> or ip address, 3rd. protocol name: ol_soctcp (i supouse tcp/ip), 4th: service : nameservice.
Donīt forget edit your host file to register both machine names and ip address, that acelerate your time connection, and also your service file to register your informix service like turbo 1526/tcp.
For simplicity work with all parameter similiar to first database server only change <machinename>.
I hope that help you.
M.E.