Netware 5.1 Server Default Gateway

We have a Network running Netware 5.1 Our problem is that we have remote site that can not see the server in the Corp Location. The remote site can ping there router and our router but can not ping the Server. We do not have a Default Gateway setup on the server and I feel that this is the problem but don’t know how to setup a Default gateway on the Server and don’t know what services need to be loaded to run a Default Gateway.