ルータPCのLAN側配下のクライアントPCから、ルータPCのWAN側IPを使ってルータPCと通信できない

[mitty]

• Ubuntuでルータを構成している場合、LAN側のクライアントPCからルータPCのLAN側IPへの通信は当然出来るが、WAN側IPを用いてルータPCと通信することが出来ない。

[mitty]

133.xy.zz.39

• ネットワーク図

       133.xy.zz.39
            |
         <eth1>
     <<ubuntu-napt>>
         <eth0>
            |
     192.168.100.254
            |
            |
  ((192.168.100.0/24))
                |
                |
          Win Vista(192.168.100.250)
  

• Vista> ping 133.xy.zz.39 -n 1
  • timed out
  1. ubuntu-napt:eth0 icmp

     16:03:26.761563 IP 192.168.100.250 > 133.xy.zz.39: ICMP echo request, id 1, seq 7590, length 40
     

  2. ubuntu-napt:eth1 icmp

     16:03:26.761625 IP 133.xy.zz.39 > 192.168.100.250: ICMP echo reply, id 1, seq 7590, length 40
     

• Vista => https://133.xy.zz.39:443/ にアクセスした場合
  • 接続不能
  1. ubuntu-napt:eth0 port 443

     16:07:18.202831 IP 192.168.100.250.49492 > 133.xy.zz.39.443: S 1239710250:1239710250(0) win 8192 <mss 1460,nop,nop,sackOK>
     16:07:21.186875 IP 192.168.100.250.49492 > 133.xy.zz.39.443: S 1239710250:1239710250(0) win 8192 <mss 1460,nop,nop,sackOK>
     16:07:27.187690 IP 192.168.100.250.49492 > 133.xy.zz.39.443: S 1239710250:1239710250(0) win 8192 <mss 1460,nop,nop,sackOK>
     

  2. ubuntu-napt:eth1 port 443

     16:07:18.203252 IP 133.xy.zz.39.443 > 192.168.100.250.49492: S 2405461547:2405461547(0) ack 1239710251 win 5840 <mss 1460,nop,nop,sackOK>
     16:07:21.187170 IP 133.xy.zz.39.443 > 192.168.100.250.49492: S 2405461547:2405461547(0) ack 1239710251 win 5840 <mss 1460,nop,nop,sackOK>
     16:07:21.462811 IP 133.xy.zz.39.443 > 192.168.100.250.49492: S 2405461547:2405461547(0) ack 1239710251 win 5840 <mss 1460,nop,nop,sackOK>
     16:07:27.187721 IP 133.xy.zz.39.443 > 192.168.100.250.49492: S 2405461547:2405461547(0) ack 1239710251 win 5840 <mss 1460,nop,nop,sackOK>
     16:07:27.463155 IP 133.xy.zz.39.443 > 192.168.100.250.49492: S 2405461547:2405461547(0) ack 1239710251 win 5840 <mss 1460,nop,nop,sackOK>
     16:07:31.262990 IP 133.xy.zz.39.443 > 192.168.100.250.49491: S 1142715877:1142715877(0) ack 2564162534 win 5840 <mss 1460,nop,nop,sackOK,nop,wscale 5>
     16:07:39.462611 IP 133.xy.zz.39.443 > 192.168.100.250.49492: S 2405461547:2405461547(0) ack 1239710251 win 5840 <mss 1460,nop,nop,sackOK>
     16:08:03.462984 IP 133.xy.zz.39.443 > 192.168.100.250.49492: S 2405461547:2405461547(0) ack 1239710251 win 5840 <mss 1460,nop,nop,sackOK>