128 lines
4.5 KiB
Groff
128 lines
4.5 KiB
Groff
.\" $NetBSD: bah.4,v 1.10 1999/12/15 23:44:51 abs Exp $
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.\"
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.\" Copyright (c) 1995, 1997 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Ignatios Souvatzis.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" The following requests are required for all man pages.
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.Dd May 31, 1995
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.Os
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.Dt BAH 4 amiga
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.Sh NAME
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.Nm bah
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.Nd ARCnet network driver for SMC COM90C26 based boards
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.Sh SYNOPSIS
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.Cd "bah* at zbus0"
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.Sh DESCRIPTION
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The
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.Nm
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interface provides access to the 2.5 Mb/s ARCnet network via the
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.Tn SMC
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COM90C26 + COM90C32
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ARCnet chip set.
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.Pp
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Each of the host's network addresses
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is specified at boot time with an
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.Dv SIOCSIFADDR
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.Xr ioctl .
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The interface MTU is 507 for protocols that do not use link level fragmentation
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and 60480 bytes for the others. The routing layer may specify additional
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limits.
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.br
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Currently supported protocols are IPv4(+ARP), and IPv6.
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.Sh IP version 4 considerations
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When the NOARP flag is set on the
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.Nm
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interface,
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it does not employ the address resolution protocol described in
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.Xr arp 4
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to dynamically map between Internet and Ethernet addresses on the local
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network. Instead, it uses the least significant 8 bits of the IP address
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as hardware address, as described in
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.Xr RFC 1051
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and
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.Xr RFC 1201 .
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.Pp
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With the IFF_LINK0 flag cleared, IP and ARP encoding is done according to the
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deprecated, but popular among Amiga users, RFC 1051 encoding (that
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is, with simple header, packet type 240 / 241), and the MTU is 507.
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.Pp
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With the IFF_LINK0 flag set, IP/ARP/RARP encoding is done according to RFC 1201
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(that is, with Packet Header Definition Standard header and packet type
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212/213). The MTU is normally 1500.
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.Pp
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When switching between the two modes, do a
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.Cd ifconfig interfacename down up
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to switch the mtu.
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.Pp
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When the IFF_LINK2 flag is set, ARP packets are sent with the protocol type
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encoded as it would be in the ARCnet header, and decoded to the right protocol
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encoding on reception. According to "assigned numbers", this is wrong, but
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some legacy software (namely, AmiTCP 3.0beta) shows this bug.
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.Pp
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.Sh HARDWARE
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The
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.Nm
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interface supports the following Zorro II expansion cards:
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.Bl -tag -width "AMERISTAR" -offset indent
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.It Em A2060
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Commodore's ARCnet card, manufacturer\ 514, product\ 9
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.It Em AMERISTAR
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Ameristar's ARCnet card, manufacturer\ 1053, product\ 9
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.El
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.Sh SEE ALSO
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.Xr arp 4 ,
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.Xr ifconfig 8 ,
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.Xr inet 4 ,
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.Xr intro 4 ,
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.Xr RFC1051
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,
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.Xr RFC1201
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,
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.Xr RFC2497
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.br
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ARCnet Packet Header Definition Standard, Novell Inc., 1989
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.Sh STANDARDS
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RFC 1051 / RFC1201 with ARP, or without, using direct mapping of lower 8 IP
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address bits instead.
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.Sh HISTORY
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The
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.Tn Amiga
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.Nm
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interface first appeared in
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.Nx 1.1 .
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ARP support was added in
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.Nx 1.3 .
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.Sh AUTHOR
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Ignatios Souvatzis
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