Original vpn firewall

src/freedombone-utils-firewall

 }
 
 function firewall_disable_vpn {
-    iptables -D INPUT -p udp --dport 1194 -j ACCEPT
+    iptables -D INPUT -i ${FIREWALL_EIFACE} -m state --state NEW -p udp --dport 1194 -j ACCEPT
     iptables -D INPUT -p tcp --dport 1194 -j ACCEPT
     iptables -D INPUT -i tun+ -j ACCEPT
     iptables -D FORWARD -i tun+ -j ACCEPT
 }
 
 function firewall_enable_vpn {
-    iptables -A INPUT -p udp --dport 1194 -j ACCEPT
+    iptables -A INPUT -i ${FIREWALL_EIFACE} -m state --state NEW -p udp --dport 1194 -j ACCEPT
     iptables -A INPUT -p tcp --dport 1194 -j ACCEPT
     iptables -A INPUT -i tun+ -j ACCEPT
     iptables -A FORWARD -i tun+ -j ACCEPT