1.\" Copyright (c) 1986, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)ex.4 8.1 (Berkeley) 06/05/93 7.\" 8.Dd 9.Dt EX 4 vax 10.Os BSD 4.2 11.Sh NAME 12.Nm ex 13.Nd Excelan 10 Mb/s Ethernet interface 14.Sh SYNOPSIS 15.Cd "device ex0 at uba0 csr 164000 vector excdint" 16.Sh DESCRIPTION 17The 18.Nm ex 19interface provides access to a 10 Mb/s Ethernet network through 20an Excelan controller used as a link-layer interface. 21.Pp 22Each of the host's network addresses 23is specified at boot time with an 24.Dv SIOCSIFADDR 25.Xr ioctl 2 . 26The 27.Nm ex 28interface employs the address resolution protocol described in 29.Xr arp 4 30to dynamically map between Internet and Ethernet addresses on the local 31network. 32.Pp 33The interface normally tries to use a 34.Dq trailer 35encapsulation 36to minimize copying data on input and output. 37The use of trailers is negotiated with 38.Tn ARP . 39This negotiation may be disabled, on a per-interface basis, 40by setting the 41.Dv IFF_NOTRAILERS 42flag with an 43.Dv SIOCSIFFLAGS 44.Xr ioctl . 45.Sh DIAGNOSTICS 46.Bl -diag 47.It "ex%d: HW %c.%c, NX %c.%c, hardware address %s." 48This provides firmware revisions levels, and is expected during 49autoconfiguration. 50.Pp 51.It ex%d: can't initialize. 52There was a failure in allocating unibus resources for the device. 53.Pp 54.It "ex%d: configuration failed; cc = %x." 55The hardware indicated an error when trying to initalize itself. 56The error code returned is described at length in the device 57Reference Manual. 58.Pp 59.It ex%d: receive error %b. 60The hardware indicated an error 61in reading a packet from the cable. 62Specific Error bits are provided 63.Pp 64.It ex%d: transmit error %b. 65The hardware indicated an error 66in transmitting a packet to the cable or an illegally sized packet. 67Specific Error bits are provided 68.Pp 69.It ex%d: can't handle af%d. 70The interface was handed 71a message with addresses formatted in an unsuitable address 72family; the packet was dropped. 73.El 74.Sh SEE ALSO 75.Xr netintro 4 , 76.Xr inet 4 , 77.Xr arp 4 78.Sh HISTORY 79The 80.Nm 81driver appeared in 82.Bx 4.3 . 83