add some additional documentation and references
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.\" $NetBSD: sl.4,v 1.2 1997/04/09 04:36:34 mikel Exp $
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.\" $NetBSD: sl.4,v 1.3 1998/04/30 05:42:40 fair Exp $
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.\"
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.\"
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.\" Copyright (c) 1983, 1991, 1993
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.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\" The Regents of the University of California. All rights reserved.
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@ -38,17 +38,41 @@
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.Os NetBSD
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.Os NetBSD
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.Sh NAME
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.Sh NAME
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.Nm sl
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.Nm sl
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.Nd slip network interface
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.Nd Serial Line IP (SLIP) network interface
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.Sh SYNOPSIS
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.Sh SYNOPSIS
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.Cd pseudo-device sl Op Ar count
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.Cd pseudo-device sl Op Ar count
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.Sh DESCRIPTION
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.Sh DESCRIPTION
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The
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The
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.Nm
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.Nm
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interface allows serial lines to be used as network interfaces using the
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interface allows asynchronous serial lines to be used as
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.Em SLIP
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.Tn IP
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protocol. The
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network interfaces using the
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.Tn SLIP
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protocol.
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The
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.Nm
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.Nm
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interface can use Van Jacobson TCP header compression and ICMP filtering.
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interface can use Van Jacobson
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.Tn TCP
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header compression and
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.Tn ICMP
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filtering.
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.Pp
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However,
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.Tn SLIP
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can only transmit
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.Tn IP
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packets between preconfigured hosts on an asynchronous serial link.
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It has no provision for address negotiation,
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carriage of additional protocols (e.g.
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.Tn XNS ,
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.Tn AppleTalk ,
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.Tn DECNET ) ,
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and is not designed for synchronous serial links.
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This is why
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.Tn SLIP
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has been superceded by the Point-to-Point Protocol
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.Pq Tn PPP ,
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which does all of those things, and much more.
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.Sh DIAGNOSTICS
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.Sh DIAGNOSTICS
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.Bl -diag
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.Bl -diag
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.It sl%d: af%d not supported.
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.It sl%d: af%d not supported.
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@ -59,9 +83,17 @@ family; the packet was dropped.
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.Sh SEE ALSO
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.Sh SEE ALSO
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.Xr intro 4 ,
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.Xr intro 4 ,
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.Xr inet 4 ,
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.Xr inet 4 ,
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.Xr ppp 4 ,
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.Xr slattach 8 ,
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.Xr slattach 8 ,
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.Xr sliplogin 8 ,
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.Xr sliplogin 8 ,
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.Xr slstats 8
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.Xr slstats 8
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.Rs
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.%J RFC
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.%N 1055
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.%A John Romkey
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.%D June 1988
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.%T "A Nonstandard for Transmission of IP Datagrams over Serial Lines: SLIP"
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.Re
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.Sh HISTORY
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.Sh HISTORY
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The
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The
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.Nm
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.Nm
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