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Tutorials on various IT applications.

What is tcp wrapper what are the config files and how to determine if a service is using it

Protects network services by applying ACLs that control which machines can access that service

example for sshd

ldd /usr/sbin/sshd | grep libwrap

if libwrap is used => using tcp wrapper

ACL files in /etc/hosts.allow & /etc/hosts.deny

References

[1] https://www.centos.org/docs/5/html/Deployment_Guide-en-US/ch-tcpwrappers.html