I am experimenting GrSecurity ACL on a Gentoo machine. 
The default ACL is quite restrictive. As far as network is concerned,
it allows name resolution through NSCD and the local DNS server;
/bin and /usr/bin are allowed for execution
Here is what I got for Nessus & Nmap -- I don't understand why the
learning mode did not add any connect or bind ACL. Maybe because of
+CAP_NET_RAW and +CAP_NET_BIND_SERVICE

/usr/sbin/nessusd {
        /var/lib/nessus/users   rw
        /var/lib/nessus
        /var/lib
        /var
        /usr/lib/nessus/plugins/.desc   rw
        /proc/net/route         r
        /
        +CAP_NET_BIND_SERVICE
        +CAP_NET_RAW
}

/usr/bin/nmap {
        +CAP_NET_RAW
}
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