Administration Guide : Security settings : Built-in ACLs

Built-in ACLs
Three built-in ACLs appear in most ACL-selection pull-downs:
None
The service is available to anyone
No Access
Hides the service from everyone
Local Hosts only
Allows access from networks physically connected or bridged to the server
It is, however, also possible to establish custom ACLs. That’s what this chapter describes.