core/system/base/tcp-wrappers/files/hosts.allow

# hosts.allow:
#   This file describes the names of the hosts which are allowed to use
#   the local INET services and tcp-wrappers aware programs, as decided by the '/usr/sbin/tcpd' server.
#
# Tcp-wrappers aware progs: Rpcbind, OpenSSH, vsftpd, nfs-utils (mountd), ClamAV
# PS: NFS uses rpcbind