once you installed Linux based firewall CSF and after installation your ping request has been blocked or it shows that packet are dropping at 80% or some time 90% , You need to reconfigure your firewall and here is the method of it
Rule to enable ICMP ping incoming client request ( assuming that default iptables policy is to drop all INPUT and OUTPUT packets)
SERVER_IP=”202.54.10.20″
iptables -A INPUT -p icmp –icmp-type 8 -s 0/0 -d $SERVER_IP -m state –state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A OUTPUT -p icmp –icmp-type 0 -s $SERVER_IP -d 0/0 -m state –state ESTABLISHED,RELATED -j ACCEPT
Restart your firewall
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Rule to enable ICMP ping incoming client request ( assuming that default iptables policy is to drop all INPUT and OUTPUT packets)
SERVER_IP=”202.54.10.20″
iptables -A INPUT -p icmp –icmp-type 8 -s 0/0 -d $SERVER_IP -m state –state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A OUTPUT -p icmp –icmp-type 0 -s $SERVER_IP -d 0/0 -m state –state ESTABLISHED,RELATED -j ACCEPT
Restart your firewall
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