anubis:~# ufw disable
Firewall stopped and disabled on system startup
anubis:~# iptables -A PREROUTING -t nat -i eth1 -p tcp --dport 81 -j DNAT --to 192.168.16.8:3000
anubis:~# iptables -A INPUT -p tcp -m state --state NEW --dport 81 -i eth1 -j ACCEPT
anubis:~# iptables -I FORWARD -p tcp --dport 81 -i eth1 -j ACCEPT
anubis:~# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
fail2ban-apache  tcp  --  anywhere             anywhere            multiport dports www,https
fail2ban-ssh  tcp  --  anywhere             anywhere            multiport dports ssh
fail2ban-apache-overflows  tcp  --  anywhere             anywhere            multiport dports www,https
fail2ban-ssh-ddos  tcp  --  anywhere             anywhere            multiport dports ssh
ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:81

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:81

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain fail2ban-apache (1 references)
target     prot opt source               destination
RETURN     all  --  anywhere             anywhere

Chain fail2ban-apache-overflows (1 references)
target     prot opt source               destination
RETURN     all  --  anywhere             anywhere

Chain fail2ban-ssh (1 references)
target     prot opt source               destination
RETURN     all  --  anywhere             anywhere

Chain fail2ban-ssh-ddos (1 references)
target     prot opt source               destination
RETURN     all  --  anywhere             anywhere
anubis:~#