Security

1. Need to configure IPTables (there is a standard template)
2. Need to enable IPTables and disable Firewalld
- systemctl mask firewalld
- systemctl stop firewalld
-  systemctl enable iptables
- systemctl enable ip6tables
- systemctl start iptables
- systemctl start ip6tables

3. Set up denyhosts
4. Modify default SSH configuration 
