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?






ssh networking freebsd sshd syslog






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?






    ssh networking freebsd sshd syslog






    share

























      0












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      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?






      ssh networking freebsd sshd syslog






      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




      ssh networking freebsd sshd syslog





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      asked 4 mins ago









      Roxy

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