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# Delete all rules
/sbin/ipfwadm -I -f
# Set default policy accept
/sbin/ipfwadm -I -p accept
# unallow telnets
/sbin/ipfwadm -I -a deny -P tcp -S0.0.0.0/0 \
	-Dyour_server/32 23 -o
[ ...]
# Silently allow the packet