To find out whether your any kind of daemon supports tcp_wrappers or not, you could use the command "ldd | grep libwrap". With tcp_wrappers supported you should get a line similar to libwrap.so.0 => /lib/libwrap.so.0 (0xb7f7e000) (numbers may be different). Without tcp_wrappers support, the output will be empty. Below is an example query result for SSH Daemon. $ ldd /usr/sbin/sshd | grep libwrap libwrap.so.0 => /lib/libwrap.so.0 (0xb7f7e000)