FreeBSD 7.0 manual page repository

FreeBSD is a free computer operating system based on BSD UNIX originally. Many IT companies, like DeployIS is using it to provide an up-to-date, stable operating system.

lo - software loopback network interface



      lo - software loopback network interface


      device loop


      The loop interface is a software loopback mechanism which may be used for
      performance analysis, software testing, and/or local communication.  As
      with other network interfaces, the loopback interface must have network
      addresses assigned for each address family with which it is to be used.
      These addresses may be set or changed with the SIOCSIFADDR ioctl(2).  The
      loopback interface should be the last interface configured, as protocols
      may use the order of configuration as an indication of priority.  The
      loopback should never be configured first unless no hardware interfaces


      lo%d: can     t handle af%d.  The interface was handed a message with
      addresses formatted in an unsuitable address family; the packet was
      inet(4), intro(4)


      The lo device appeared in 4.2BSD.


      Previous versions of the system enabled the loopback interface automatiā€
      cally, using a nonstandard Internet address (127.1).  Use of that address
      is now discouraged; a reserved host address for the local network should
      be used instead.


Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.