logging outbound traffic iptables











up vote
0
down vote

favorite












I am pretty new to iptables and I make some exercices for myself to gain knowledge. Let assume the following scenario:



I have a gateway (internal IP=192.168.1.1, external IP=172.17.0.28, interface eth0) and I have a client in the subnet of the gateway (internal IP=192.168.1.2).



Now, I masqueraded the gateway that I have the possibility to use internet from the client over the gateway with the following nat table entry:
-A POSTROUTING -o eth0 -j MASQUERADE



My current target is to log all ICMP packets from client, which are routed over the gateway to the internet and all coming from the internet to the client. I want to log all "internet communication" from client over the gateway. How I can reach that?



My first approach was an entry by the gateway:
iptables -A FORWARD -i eth0 -d 192.168.1.2 -p icmp -j NFLOG
iptables -A FORWARD -d eth0 -s 192.168.1.2 -p icmp -j NFLOG



But that doesn't work. Could you give me a little hint what I miss by my thoughts?



Greetings










share|improve this question


























    up vote
    0
    down vote

    favorite












    I am pretty new to iptables and I make some exercices for myself to gain knowledge. Let assume the following scenario:



    I have a gateway (internal IP=192.168.1.1, external IP=172.17.0.28, interface eth0) and I have a client in the subnet of the gateway (internal IP=192.168.1.2).



    Now, I masqueraded the gateway that I have the possibility to use internet from the client over the gateway with the following nat table entry:
    -A POSTROUTING -o eth0 -j MASQUERADE



    My current target is to log all ICMP packets from client, which are routed over the gateway to the internet and all coming from the internet to the client. I want to log all "internet communication" from client over the gateway. How I can reach that?



    My first approach was an entry by the gateway:
    iptables -A FORWARD -i eth0 -d 192.168.1.2 -p icmp -j NFLOG
    iptables -A FORWARD -d eth0 -s 192.168.1.2 -p icmp -j NFLOG



    But that doesn't work. Could you give me a little hint what I miss by my thoughts?



    Greetings










    share|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I am pretty new to iptables and I make some exercices for myself to gain knowledge. Let assume the following scenario:



      I have a gateway (internal IP=192.168.1.1, external IP=172.17.0.28, interface eth0) and I have a client in the subnet of the gateway (internal IP=192.168.1.2).



      Now, I masqueraded the gateway that I have the possibility to use internet from the client over the gateway with the following nat table entry:
      -A POSTROUTING -o eth0 -j MASQUERADE



      My current target is to log all ICMP packets from client, which are routed over the gateway to the internet and all coming from the internet to the client. I want to log all "internet communication" from client over the gateway. How I can reach that?



      My first approach was an entry by the gateway:
      iptables -A FORWARD -i eth0 -d 192.168.1.2 -p icmp -j NFLOG
      iptables -A FORWARD -d eth0 -s 192.168.1.2 -p icmp -j NFLOG



      But that doesn't work. Could you give me a little hint what I miss by my thoughts?



      Greetings










      share|improve this question













      I am pretty new to iptables and I make some exercices for myself to gain knowledge. Let assume the following scenario:



      I have a gateway (internal IP=192.168.1.1, external IP=172.17.0.28, interface eth0) and I have a client in the subnet of the gateway (internal IP=192.168.1.2).



      Now, I masqueraded the gateway that I have the possibility to use internet from the client over the gateway with the following nat table entry:
      -A POSTROUTING -o eth0 -j MASQUERADE



      My current target is to log all ICMP packets from client, which are routed over the gateway to the internet and all coming from the internet to the client. I want to log all "internet communication" from client over the gateway. How I can reach that?



      My first approach was an entry by the gateway:
      iptables -A FORWARD -i eth0 -d 192.168.1.2 -p icmp -j NFLOG
      iptables -A FORWARD -d eth0 -s 192.168.1.2 -p icmp -j NFLOG



      But that doesn't work. Could you give me a little hint what I miss by my thoughts?



      Greetings







      logging iptables






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 22 at 15:02









      user3461406

      11




      11





























          active

          oldest

          votes











          Your Answer






          StackExchange.ifUsing("editor", function () {
          StackExchange.using("externalEditor", function () {
          StackExchange.using("snippets", function () {
          StackExchange.snippets.init();
          });
          });
          }, "code-snippets");

          StackExchange.ready(function() {
          var channelOptions = {
          tags: "".split(" "),
          id: "1"
          };
          initTagRenderer("".split(" "), "".split(" "), channelOptions);

          StackExchange.using("externalEditor", function() {
          // Have to fire editor after snippets, if snippets enabled
          if (StackExchange.settings.snippets.snippetsEnabled) {
          StackExchange.using("snippets", function() {
          createEditor();
          });
          }
          else {
          createEditor();
          }
          });

          function createEditor() {
          StackExchange.prepareEditor({
          heartbeatType: 'answer',
          convertImagesToLinks: true,
          noModals: true,
          showLowRepImageUploadWarning: true,
          reputationToPostImages: 10,
          bindNavPrevention: true,
          postfix: "",
          imageUploader: {
          brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
          contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
          allowUrls: true
          },
          onDemand: true,
          discardSelector: ".discard-answer"
          ,immediatelyShowMarkdownHelp:true
          });


          }
          });














          draft saved

          draft discarded


















          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53433671%2flogging-outbound-traffic-iptables%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown






























          active

          oldest

          votes













          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes
















          draft saved

          draft discarded




















































          Thanks for contributing an answer to Stack Overflow!


          • Please be sure to answer the question. Provide details and share your research!

          But avoid



          • Asking for help, clarification, or responding to other answers.

          • Making statements based on opinion; back them up with references or personal experience.


          To learn more, see our tips on writing great answers.





          Some of your past answers have not been well-received, and you're in danger of being blocked from answering.


          Please pay close attention to the following guidance:


          • Please be sure to answer the question. Provide details and share your research!

          But avoid



          • Asking for help, clarification, or responding to other answers.

          • Making statements based on opinion; back them up with references or personal experience.


          To learn more, see our tips on writing great answers.




          draft saved


          draft discarded














          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53433671%2flogging-outbound-traffic-iptables%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown





















































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown

































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown







          Popular posts from this blog

          What visual should I use to simply compare current year value vs last year in Power BI desktop

          Alexandru Averescu

          Trompette piccolo