Basis CentOS minimum

• yum upgrade

Vervangen van Firewalld voor Iptables (geen regels mee nemen)

• sudo yum install iptables-services
• sudo systemctl stop firewalld
• sudo systemctl start iptables
• sudo systemctl start ip6tables

• sudo systemctl enable iptables
• sudo systemctl enable ip6tables
• sudo systemctl disable firewalld
• sudo systemctl mask firewalld

Howto source

Aanpassen van standaard SSH settings:

• vi /etc/ssh/sshd_config
  • Poort nummer
    • Port 22522
  • Disable root login
    • PermitRootLogin no
  • Disable X11
    • X11Forwarding no
•  systemctl restart sshd

Toevoegen van remote SSH toegang:

• iptables -L
• vi /etc/sysconfig/iptables
• Standaard : “-A INPUT -p tcp -m state –state NEW -m tcp –dport 22 -j ACCEPT”
• specifieker met source IP (vb 192.0.2.1)
  • -A INPUT -p tcp -s 192.0.2.1 -m state –state NEW -m tcp –dport 22522 -j ACCEPT
• systemctl restart iptables.service
• iptables -L

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