Using TCP_WRAPPERS makes securing your servers against outside intrusion is a lot simpler and painless. TCP_WRAPPERS is controlled from two files:
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/etc/hosts.allowhosts.allow is checked first, and the rules are checked from first to last. If it finds a rule that explicitly allows you in (i.e., a rule allowing your host, domain, subnet mask, etc.) it lets you connect to the service. If it fails to find any rules that pertain to you in hosts.allow, it then goes to check hosts.deny for a rule denying you entry.
/etc/hosts.deny
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