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Disable FirewallD and enable/import IPTables rules
1) Clear the default firewall rules in FirewallD. #iptables -F #iptables -t nat -F 2) Disable firewalld. #systemctl stop firewalld #systemctl disable firewalld #systemctl mask firewalld 3) Install iptables-services. #yum install iptables-services #systemctl start iptables #systemctl enable iptables 4)Clear again the iptables rules. #iptables -F #iptables -t nat -F 5) Import iptable rules and saved…
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Allow incoming/outgoing SNMP traffic in IPTables
Allow outgoing SNMP traffic in IPTables iptables -A INPUT -i eth0 -p udp -s–sport 161:162 -d –dport 1024:65535 -m state –state ESTABLISHED -j ACCEPT iptables -A OUTPUT -p udp -s –sport 1024:65535 -d –dport 161:162 -m state –state NEW,ESTABLISHED -j ACCEPT Allow incoming SNMP traffic in IPTables iptables -A INPUT -i eth0 -p udp -s…
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Allow Incoming/Outgoing ICMP traffic in IPTables
Enable or allow ICMP ping incoming client request. iptables -A INPUT -i eth0 -p icmp –icmp-type 8 -s-d -m state –state NEW,ESTABLISHED,RELATED -j ACCEPT iptables -A OUTPUT -p icmp –icmp-type 0 -s -d -m state –state ESTABLISHED,RELATED -j ACCEPT Allow or enable outgoing ping request. iptables -A INPUT -i eth0 -p icmp –icmp-type 0 -s-d…
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How to use IPTABLES
To Drop IP in iptables Port Specific: iptables -A INPUT -p tcp -s xx.xx.xx.xx –dport {PORT} -j DROP iptables -A INPUT -p tcp -s xx.xx.xx.xx –dport 80 -j DROP /sbin/service iptables save No Port Specified: iptables -A INPUT -s xx.xx.xx.xx -j DROP /sbin/service iptables save Example: /sbin/iptables -I INPUT -s {IP-HERE} -j DROP /sbin/iptables -I…