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Linux IPTABLES help
I'm new to Linux and I made a big mistake at work recently locking myself out of our own server
.I did iptables -F first as the tutorial said and then entered the rules. I wanted to start over again so I did iptables -F and it locked us out. We had to get someone to physically restart iptables before we could get back in. Any idea why the second iptables -F locked me out and how to avoid it and know when it will flush everything and when it will lock out? Thanks I used some rules I saw in a tutorial as follows: iptables -F iptables -A INPUT -I lo -p all -j ACCEPT iptables -A OUTPUT -o lo -p all -j ACCEPT iptables -A INPUT -I eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A INPUT -p tcp --tcp-option ! 2 -j REJECT --reject-with tcp-reset iptables -A INPUT -p tcp -I eth0 --dport 22 -j ACCEPT iptables -A INPUT -p udp -I eth0 --dport 22 -j ACCEPT iptables -A INPUT -p tcp -I eth0 --dport 80 -j ACCEPT iptables -A INPUT -p udp -I eth0 --dport 80 -j ACCEPT iptables -A INPUT -p tcp -I eth0 --dport 53 -j ACCEPT iptables -A INPUT -p udp -I eth0 --dport 53 -j ACCEPT iptables -P INPUT DROP |
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