
42 EFS Systems on a Linux Base: Additional Topics
With our router, there was a browser panel to define rules. These rules connected specific
services (ftp, telnet, finger, http, and so forth)
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to specific local IP addresses. Rules exist for
inbound and outbound services. By default, all local systems (Linux, z/OS, and Windows in
our example) were permitted to use all outbound services. By default, no local system is
connected to any inbound service. An inbound service (such as an ftp request) should be
connected to only one local system (such as z/OS, in our example).
In addition to connecting service requests (inbound and outbound), the r