iptables

# In response to http://serverfault.com/questions/482992/iptables-tcp-handshake-on-centos-6-0/483003#comment537538_483003
# Generated by iptables-save v1.4.7 on Wed Feb 27 17:24:45 2013
*mangle
:PREROUTING ACCEPT [7:364]
:INPUT ACCEPT [7:364]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [7:876]
:POSTROUTING ACCEPT [7:876]
COMMIT
# Completed on Wed Feb 27 17:24:45 2013
# Generated by iptables-save v1.4.7 on Wed Feb 27 17:24:45 2013
*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [2:328]
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m multiport --dports 22,80,443 -m state --state NEW,ESTABLISHED -j ACCEPT
-A INPUT -p udp -m udp --sport 53 --dport 1024:65535 -j ACCEPT
COMMIT
# Completed on Wed Feb 27 17:24:45 2013
# Generated by iptables-save v1.4.7 on Wed Feb 27 17:24:45 2013
*nat
:PREROUTING ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
COMMIT
# Completed on Wed Feb 27 17:24:45 2013