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Hello.
I know Linux firewalls can detect most of services automatically and add properly rules about them. For example, when you install a web server then a rule about open the port 80 added, but these kind of firewalls can be enough for protect a web server? Can they block some tools like Nmap or MSF?
Can Linux firewalls like SuSEfirewall2, Firewall-cmd and UFW detect scanners and inform system administrator? For example, write in a log file, "Nmap" detected.
The task of a firewall is to block some traffic and let specific traffic through. But there is no law that limits tools to do only that. There might be firewall tools that are self-learning (e.g. the one in Windows) and add IDS functionality. It seems to me that firewalld concentrates on the firewall task. I think ufw, which stands for “uncomplicated firewall”, and SUSEfirewall2 do as well.
Car analogy: It’s the task of a car to bring you from A to B, but some cars have an entertainment system, internet and a kitchen.
Last edited by berndbausch; 12-21-2018 at 03:38 AM.
Hello.
I know Linux firewalls can detect most of services automatically and add properly rules about them. For example, when you install a web server then a rule about open the port 80 added, but these kind of firewalls can be enough for protect a web server? Can they block some tools like Nmap or MSF?
Can Linux firewalls like SuSEfirewall2, Firewall-cmd and UFW detect scanners and inform system administrator? For example, write in a log file, "Nmap" detected.
Thank you.
If you set firewalld or SuSEfirewall2 to allow port 80/443, it will allow from any IPs for those ports, then you have to create rules for any additional things (nmap etc) to block. Perhaps only limit traffic from certain subnets, and block everything else (if that meets your requirements).
The task of a firewall is to block some traffic and let specific traffic through. But there is no law that limits tools to do only that. There might be firewall tools that are self-learning (e.g. the one in Windows) and add IDS functionality. It seems to me that firewalld concentrates on the firewall task. I think ufw, which stands for “uncomplicated firewall”, and SUSEfirewall2 do as well.
Car analogy: It’s the task of a car to bring you from A to B, but some cars have an entertainment system, internet and a kitchen.
Can these kind of firewalls block DDoS attack? Or a hardware firewall needed?
There is no "silver-bullet" when it comes to DDoS. For SSH and Apache, I have used fail2ban.
I came across this while I was looking for something similar, thought to share here: https://www.configserver.com/cp/csf.html
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SuSEfirewall2, Firewall-cmd and UFW
