Iptables

OpenVZ IPtables:

# Generated by HyperSecure Solutions v1.2 on August 8, 2013
*filter
:FORWARD DROP [0:0]
:INPUT DROP [0:0]
:OUTPUT ACCEPT [187:19244]
:portdrop - [0:0]

# Block bad tcp flags
 [0:0] -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -j portdrop
[0:0] -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,SYN,RST,PSH,ACK,URG -j portdrop
[0:0] -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,SYN,RST,ACK,URG -j portdrop
[0:0] -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -j portdrop
[0:0] -A INPUT -p tcp -m tcp --tcp-flags SYN,RST SYN,RST -j portdrop
[0:0] -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -j portdrop

#ICMP Drops
-A INPUT -p icmp -m icmp --icmp-type 18 -j DROP
-A INPUT -p icmp -m icmp --icmp-type 17 -j DROP
-A INPUT -p icmp -m icmp --icmp-type 10 -j DROP
-A INPUT -p icmp -m icmp --icmp-type 9 -j DROP
-A INPUT -p icmp -m icmp --icmp-type 5 -j DROP
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -m icmp --icmp-type 8 -m limit --limit 1/sec -j ACCEPT

#Server Ports
-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
-A INPUT -p tcp -m tcp -j DROP
-A INPUT -p udp -m udp -j DROP
-A OUTPUT -o lo -j ACCEPT
-A OUTPUT -p icmp -m state --state NEW -j ACCEPT
-A portdrop -p tcp -m tcp -j REJECT --reject-with tcp-reset
-A portdrop -j DROP
COMMIT

KVM IPtables :

# Generated by HyperSecure Solutions v1.3 on June 26, 2015
*filter
:FORWARD DROP [0:0]
:INPUT DROP [0:0]
:OUTPUT ACCEPT [187:19244]
:portdrop - [0:0]

# Block bad tcp flags
[0:0] -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -j portdrop
[0:0] -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,SYN,RST,PSH,ACK,URG -j portdrop
[0:0] -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,SYN,RST,ACK,URG -j portdrop
[0:0] -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -j portdrop
[0:0] -A INPUT -p tcp -m tcp --tcp-flags SYN,RST SYN,RST -j portdrop
[0:0] -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -j portdrop

#ICMP Drops
-A INPUT -p icmp -m icmp --icmp-type 18 -j DROP
-A INPUT -p icmp -m icmp --icmp-type 17 -j DROP
-A INPUT -p icmp -m icmp --icmp-type 10 -j DROP
 -A INPUT -p icmp -m icmp --icmp-type 9 -j DROP
-A INPUT -p icmp -m icmp --icmp-type 5 -j DROP
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -m icmp --icmp-type 8 -m limit --limit 1/sec -j ACCEPT

#Server Ports
-A INPUT -i eth0 -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -i eth0 -p tcp -m tcp --dport 80 -j ACCEPT
-A INPUT -i eth0 -p tcp -m tcp -j DROP
-A INPUT -i eth0 -p udp -m udp -j DROP
-A OUTPUT -o lo -j ACCEPT
-A OUTPUT -p icmp -m state --state NEW -j ACCEPT
-A portdrop -i eth0 -p tcp -m tcp -j REJECT --reject-with tcp-reset
-A portdrop -i eth0 -j DROP
COMMIT