Due to the nature of both Telnet & FTP services, they are sometimes hard to remove or shutdown on the system. TCP wrapper programs are used to control the access to these services by limiting access by Hosts and IP addresses. It works as an IP packet filtering facility and provides more specific control over Network services. It also makes use of the standard syslog facility to track local network use. TCP wrappers provide an Access control mechanism by using two files host.deny and host.allow which you install in /etc. You can download a precompiled copy of tcp_wrappers from ftp://ftp.uwsg.indiana.edu/pub/security/wrapbin.
If you are not familiar with the installation, the instructions are available in text format with examples on how to configure host.deny and host.allow files.
Hope this helps. Please write back if you need any more information.
This was first published in September 2002