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gate# ldd /usr/sbin/sshd | grep wrap
http://ubuntu-tutorials.com/2007/09/02/network-security-with-tcpwrappers-hostsallow-and-hostsdeny/
gate# cat /etc/hosts.allow
ALL: 127.0. sshd: 192.168.X.10
gate# cat /etc/hosts.deny
ALL:ALL
# :> /etc/hosts.allow
# cat /etc/hosts.deny
ALL: 172.16.1.249