Linux Iptables — Easy and Simple guide
So you just installed linux and is wondering for a good rule set for a secure firewall which does not interfere with your basic internet usage? Well no difficult at all…The following configuration is good to be implemented for a Workstation.
First lets flush all the previous iptables rules:
[root@linux ~]# iptables -F
[root@linux ~]# iptables -X
[root@linux ~]# iptables -t nat -F
[root@linux ~]# iptables -t nat -X
It is better to drop ALL packets by default and allow only the ones we want explicitly, rather than blocking stuff as threats occur:
[root@linux ~]# iptables -P INPUT DROP
[root@linux ~]# iptables -P OUTPUT DROP
[root@linux ~]# iptables -P FORWARD DROP
Let’s open up stuff as we need it, first allow all INCOMING traffic to Local Ethernet Interface ‘lo’:
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