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ADD RULE with PORT and IPADDRESS | |
sudo iptables -A INPUT -p tcp -m tcp --dport port_number -s ip_address -j ACCEPT | |
ADD RULE for PORT on all addresses | |
sudo iptables -A INPUT -p tcp -m tcp --dport port_number --sport 1024:65535 -j ACCEPT | |
DROP IPADRESS | |
sudo iptables -I INPUT -s x.x.x.x -j DROP | |
VIEW IPTABLES with rule numbers | |
sudo iptables -L INPUT -n --line-numbers | |
REMOVE A RULE | |
#Use above command and note rule_number | |
sudo iptables -D INPUT rule_number | |
#DEFAULT POLICY | |
-P INPUT DROP | |
-P OUTPUT DROP | |
-P FORWARD DROP | |
-A INPUT -i lo -j ACCEPT #allow lo input | |
-A OUTPUT -o lo -j ACCEPT #allow lo output | |
-A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables-INPUT denied: " --log-level 7 #log INPUT Denied | |
-A OUTPUT -m limit --limit 5/min -j LOG --log-prefix "iptables-OUTPUT denied: " --log-level 7 #log OUTPUT Denied | |
#ALLOW OUTPUT PING/MTR (or traceroute -I, traceroute by default uses UDP - force with ICMP) | |
-A OUTPUT -p icmp --icmp-type 8 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT | |
-A INPUT -p icmp --icmp-type 0 -m state --state ESTABLISHED,RELATED -j ACCEPT | |
-A INPUT -p icmp --icmp-type 11 -m state --state ESTABLISHED,RELATED -j ACCEPT | |
#ALLOW INPUT PING/MTR | |
-A INPUT -p icmp --icmp-type 8 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT | |
-A OUTPUT -p icmp --icmp-type 0 -m state --state ESTABLISHED,RELATED -j ACCEPT | |
#ALLOW OUTPUT | |
-A OUTPUT -p tcp -m multiport --dports 80,443 -m state --state NEW,ESTABLISHED -j ACCEPT | |
-A INPUT -p tcp -m multiport --sports 80,443 -m state --state ESTABLISHED -j ACCEPT | |
-A OUTPUT -p udp -m multiport --dports 53,123 -m state --state NEW,ESTABLISHED -j ACCEPT | |
-A INPUT -p udp -m multiport --sports 53,123 -m state --state ESTABLISHED -j ACCEPT |
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