FreeBSD 7.0 manual page repository

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edsc - Ethernet discard network interface



      edsc - Ethernet discard network interface


      device edsc


      The edsc interface is a software discard mechanism which may be used for
      performance analysis and software testing.  It imitates an Ethernet
      device, which allows for its use in conjunction with such drivers as
      if_bridge(4) and vlan(4).
      As with other network interfaces, an edsc 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) or
      ifconfig(8) utility.
      Each edsc interface is created at runtime using interface cloning.  This
      is most easily done with the ifconfig(8) create command or using the
      cloned_interfaces variable in rc.conf(5).
      ioctl(2), arp(4), if_bridge(4), inet(4), intro(4), vlan(4), rc.conf(5),
      arp(8), ifconfig(8)


      The edsc device was derived from the disc(4) device and first appeared in
      FreeBSD 6.3.  This manpage was adapted from disc(4).


      Since outgoing packets are just discarded by edsc, ARP requests stay
      unreplied.  Consequently, an IP packet cannot be sent via edsc until a
      static arp(4) entry is created for its next hop using arp(8).
      Initially an edsc interface has a zero link level address.  It can be
      changed with ifconfig(8) lladdr if needed.


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.