How to have sshd and syslogd bind to the “first IP address” of an interface?












0














I'm trying to learn to use FreeBSD jails, and following the tutorial here. One of the tasks requires that the host's services not listen to all IP addresses.



When I look for these with sockstat|grep "*:[0-9]", I get:



# sockstat|grep "*:[0-9]"
root sshd 670 3 tcp6 *:22 *:*
root sshd 670 4 tcp4 *:22 *:*
root syslogd 477 6 udp6 *:514 *:*
root syslogd 477 7 udp4 *:514 *:*


The document lists how to get these services to listen to specific IPs, but they change the services to listen to a static IP address.



For example, for /etc/ssh/sshd_config:



ListenAddress 10.0.0.1
ListenAddress 2002::7ea9


For syslogd, editing /etc/rc.conf:



syslogd_flags="-a 10.0.0.1"


My machine is assigned an IP by DHCP and I cannot know the IP address until after boot. How do I go about configuring these services to instead only listen on the first IP address and not a static IP address?









share



























    0














    I'm trying to learn to use FreeBSD jails, and following the tutorial here. One of the tasks requires that the host's services not listen to all IP addresses.



    When I look for these with sockstat|grep "*:[0-9]", I get:



    # sockstat|grep "*:[0-9]"
    root sshd 670 3 tcp6 *:22 *:*
    root sshd 670 4 tcp4 *:22 *:*
    root syslogd 477 6 udp6 *:514 *:*
    root syslogd 477 7 udp4 *:514 *:*


    The document lists how to get these services to listen to specific IPs, but they change the services to listen to a static IP address.



    For example, for /etc/ssh/sshd_config:



    ListenAddress 10.0.0.1
    ListenAddress 2002::7ea9


    For syslogd, editing /etc/rc.conf:



    syslogd_flags="-a 10.0.0.1"


    My machine is assigned an IP by DHCP and I cannot know the IP address until after boot. How do I go about configuring these services to instead only listen on the first IP address and not a static IP address?









    share

























      0












      0








      0







      I'm trying to learn to use FreeBSD jails, and following the tutorial here. One of the tasks requires that the host's services not listen to all IP addresses.



      When I look for these with sockstat|grep "*:[0-9]", I get:



      # sockstat|grep "*:[0-9]"
      root sshd 670 3 tcp6 *:22 *:*
      root sshd 670 4 tcp4 *:22 *:*
      root syslogd 477 6 udp6 *:514 *:*
      root syslogd 477 7 udp4 *:514 *:*


      The document lists how to get these services to listen to specific IPs, but they change the services to listen to a static IP address.



      For example, for /etc/ssh/sshd_config:



      ListenAddress 10.0.0.1
      ListenAddress 2002::7ea9


      For syslogd, editing /etc/rc.conf:



      syslogd_flags="-a 10.0.0.1"


      My machine is assigned an IP by DHCP and I cannot know the IP address until after boot. How do I go about configuring these services to instead only listen on the first IP address and not a static IP address?









      share













      I'm trying to learn to use FreeBSD jails, and following the tutorial here. One of the tasks requires that the host's services not listen to all IP addresses.



      When I look for these with sockstat|grep "*:[0-9]", I get:



      # sockstat|grep "*:[0-9]"
      root sshd 670 3 tcp6 *:22 *:*
      root sshd 670 4 tcp4 *:22 *:*
      root syslogd 477 6 udp6 *:514 *:*
      root syslogd 477 7 udp4 *:514 *:*


      The document lists how to get these services to listen to specific IPs, but they change the services to listen to a static IP address.



      For example, for /etc/ssh/sshd_config:



      ListenAddress 10.0.0.1
      ListenAddress 2002::7ea9


      For syslogd, editing /etc/rc.conf:



      syslogd_flags="-a 10.0.0.1"


      My machine is assigned an IP by DHCP and I cannot know the IP address until after boot. How do I go about configuring these services to instead only listen on the first IP address and not a static IP address?







      ssh networking freebsd sshd syslog





      share












      share










      share



      share










      asked 4 mins ago









      Roxy

      1813




      1813



























          active

          oldest

          votes











          Your Answer








          StackExchange.ready(function() {
          var channelOptions = {
          tags: "".split(" "),
          id: "106"
          };
          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',
          autoActivateHeartbeat: false,
          convertImagesToLinks: false,
          noModals: true,
          showLowRepImageUploadWarning: true,
          reputationToPostImages: null,
          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%2funix.stackexchange.com%2fquestions%2f491410%2fhow-to-have-sshd-and-syslogd-bind-to-the-first-ip-address-of-an-interface%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 Unix & Linux Stack Exchange!


          • 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%2funix.stackexchange.com%2fquestions%2f491410%2fhow-to-have-sshd-and-syslogd-bind-to-the-first-ip-address-of-an-interface%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

          サソリ

          広島県道265号伴広島線

          Accessing regular linux commands in Huawei's Dopra Linux