sl(4)
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SL(4) NetBSD Kernel Interfaces Manual SL(4)
NAME
sl -- Serial Line IP (SLIP) network interface
SYNOPSIS
pseudo-device sl
DESCRIPTION
The sl interface allows asynchronous serial lines to be used as IPv4 net-
work interfaces using the SLIP protocol. The sl interface can use Van
Jacobson TCP header compression and ICMP filtering.
However, SLIP can only transmit IPv4 packets between preconfigured hosts
on an asynchronous serial link. It has no provision for address negotia-
tion, carriage of additional protocols (e.g. XNS, AppleTalk, DECNET),
and is not designed for synchronous serial links. This is why SLIP has
been superceded by the Point-to-Point Protocol (PPP), which does all of
those things, and much more.
DIAGNOSTICS
sl%d: af%d not supported . The interface was handed a message with
addresses formatted in an unsuitable address family; the packet was
dropped.
SEE ALSO
inet(4), intro(4), ppp(4), slattach(8), sliplogin(8), slstats(8)
A Nonstandard for Transmission of IP Datagrams over Serial Lines: SLIP,
RFC, 1055, June 1988.
HISTORY
The sl device appeared in NetBSD 1.0.
NetBSD 3.0 December 5, 2004 NetBSD 3.0
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