RouterOS有無firewall規則Connections連線數有沒有差？

當設定好RouterOS撥接pppoe上網後，想比較看看防火牆有無啟動，對於連線Connections數的差異表現。
測試的防火牆過濾規則如下：

/ ip firewall filter
add chain=input connection-state=established comment="Accept established connections"
add chain=input connection-state=related comment="Accept related connections"
add chain=input connection-state=invalid action=drop comment="Drop invalid connections" 
add chain=input protocol=udp action=accept comment="UDP" disabled=no 
add chain=input protocol=icmp limit=50/5s,2 comment="Allow limited pings" 
add chain=input protocol=icmp action=drop comment="Drop excess pings" 
add chain=input in-interface=ether2 src-address=192.168.0.0/24 comment="From our LAN" action=accept
add chain=input action=log log-prefix="DROP INPUT" comment="Log everything else"
add chain=input action=drop comment="Drop everything else"

啟用防火牆閒置3小時後的Connections連線畫面內容

關閉防火牆閒置3小時後的Connections連線畫面內容

不太懂，好像沒什麼差耶~