Показывайте iptables-save
# Generated by iptables-save v1.4.21 on Fri Jul 1 10:12:29 2016
*mangle
:PREROUTING ACCEPT [87323:63616408]
:INPUT ACCEPT [3195:190610]
:FORWARD ACCEPT [83112:63390270]
:OUTPUT ACCEPT [372:45214]
:POSTROUTING ACCEPT [83483:63435444]
COMMIT
# Completed on Fri Jul 1 10:12:29 2016
# Generated by iptables-save v1.4.21 on Fri Jul 1 10:12:29 2016
*nat
:PREROUTING ACCEPT [4143:216232]
:INPUT ACCEPT [81:5935]
:OUTPUT ACCEPT [72:4971]
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING -o eth0 -j MASQUERADE
COMMIT
# Completed on Fri Jul 1 10:12:29 2016
# Generated by iptables-save v1.4.21 on Fri Jul 1 10:12:29 2016
*filter
:INPUT DROP [2496:128371]
:FORWARD DROP [0:0]
:OUTPUT DROP [0:0]
-A INPUT -i lo -j ACCEPT
-A INPUT -i eth1 -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -m state --state INVALID -j DROP
-A INPUT -p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -m state --state NEW -j DROP
-A INPUT -i eth0 -p tcp -m tcp --dport 53 -j ACCEPT
-A INPUT -i eth0 -p udp -m udp --dport 53 -j ACCEPT
-A INPUT -i eth0 -p tcp -m tcp --dport 22 -j ACCEPT
-A FORWARD -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
-A FORWARD -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -m state --state INVALID -j DROP
-A FORWARD -i eth1 -o eth0 -j ACCEPT
-A OUTPUT -o lo -j ACCEPT
-A OUTPUT -o eth1 -j ACCEPT
-A OUTPUT -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT
-A OUTPUT -p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -m state --state NEW -j DROP
COMMIT
# Completed on Fri Jul 1 10:12:29 2016