EX(4)                  OpenBSD Programmer's Manual (VAX)                 EX(4)

NAME
     ex - Excelan 10 Mb/s Ethernet interface

SYNOPSIS
     device ex0 at uba0 csr 164000 vector excdint

DESCRIPTION
     The ex interface provides access to a 10 Mb/s Ethernet network through an
     Excelan controller used as a link-layer interface.

     Each of the host's network addresses is specified at boot time with an
     SIOCSIFADDR ioctl(2). The ex interface employs the address resolution
     protocol described in arp(4) to dynamically map between Internet and Eth-
     ernet addresses on the local network.

     The interface normally tries to use a ``trailer'' encapsulation to mini-
     mize copying data on input and output.  The use of trailers is negotiated
     with ARP. This negotiation may be disabled, on a per-interface basis, by
     setting the IFF_NOTRAILERS flag with an SIOCSIFFLAGS ioctl.

DIAGNOSTICS
     ex%d: HW %c.%c, NX %c.%c, hardware address %s.  This provides firmware
     revisions levels, and is expected during autoconfiguration.

     ex%d: can't initialize.  There was a failure in allocating unibus re-
     sources for the device.

     ex%d: configuration failed; cc = %x.  The hardware indicated an error
     when trying to initialize itself.  The error code returned is described
     at length in the device Reference Manual.

     ex%d: receive error %b.  The hardware indicated an error in reading a
     packet from the cable.  Specific Error bits are provided

     ex%d: transmit error %b.  The hardware indicated an error in transmitting
     a packet to the cable or an illegally sized packet.  Specific Error bits
     are provided

     ex%d: can't handle af%d.  The interface was handed a message with ad-
     dresses formatted in an unsuitable address family; the packet was
     dropped.

SEE ALSO
     arp(4), inet(4), netintro(4)

HISTORY
     The ex driver appeared in 4.3BSD.

OpenBSD 2.9                     March 27, 1991                               1
