I would run chmod 0 on the actual programs:
# ls -l /usr/sbin/snmpd*
lrwxrwxrwx 1 root system 9 Oct 18 18:59 /usr/sbin/snmpd -> snmpdv3ne
-rwxr-x--- 1 root system 363992 Oct 2 21:51...
The AIX scheme has two attributes: hostsallowed, hostsdenied - if I recall correctly. They are exclusive to each other, i.e., you specify what is allowed, all else is denied, or what is denied -...