Enable icmp on mesh installs

src/freedombone-mesh-batman

@@ -213,6 +213,8 @@ function start {
         ifconfig $BRIDGE up
     fi
 
+    iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT
+    iptables -A OUTPUT -p icmp --icmp-type echo-reply -j ACCEPT
     iptables -A INPUT -p tcp --dport 548 -j ACCEPT
     iptables -A INPUT -p udp --dport 548 -j ACCEPT
     iptables -A INPUT -p tcp --dport 5353 -j ACCEPT