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NetBSD 6.1.5 - man page for slip (netbsd section 4)

SL(4)				   BSD Kernel Interfaces Manual 			    SL(4)

     sl -- Serial Line IP (SLIP) network interface

     pseudo-device sl

     The sl interface allows asynchronous serial lines to be used as IPv4 network interfaces
     using the SLIP protocol.

     To use the sl interface, the administrator must first create the interface and assign a tty
     line to it.  The sl interface is created using the ifconfig(8) create subcommand, and
     slattach(8) is used to assign a tty line to the interface.  Once the interface is attached,
     network source and destination addresses and other parameters are configured via

     The sl interface can use Van Jacobson TCP header compression and ICMP filtering.  The fol-
     lowing flags to ifconfig(8) control these properties of a SLIP link:

     link0	   Turn on Van Jacobson header compression.

     -link0	   Turn off header compression. (default)

     link1	   Don't pass through ICMP packets.

     -link1	   Do pass through ICMP packets. (default)

     link2	   If a packet with a compressed header is received, automatically enable com-
		   pression of outgoing packets. (default)

     -link2	   Don't auto-enable compression.

     sl%d: af%d not supported .  The interface was handed a message with addresses formatted in
     an unsuitable address family; the packet was dropped.

     inet(4), intro(4), ppp(4), strip(4), ifconfig(8), slattach(8), sliplogin(8), slstats(8)

     J. Romkey, A Nonstandard for Transmission of IP Datagrams over Serial Lines: SLIP, RFC,
     1055, June 1988.

     Van Jacobson, Compressing TCP/IP Headers for Low-Speed Serial Links, RFC, 1144, February

     The sl device appeared in NetBSD 1.0.

     SLIP can only transmit IPv4 packets between preconfigured hosts on an asynchronous serial
     link.  It has no provision for address negotiation, carriage of additional protocols (e.g.
     XNS, AppleTalk, DECNET), and is not designed for synchronous serial links.  This is why SLIP
     has been superseded by the Point-to-Point Protocol (PPP), which does all of those things,
     and much more.

BSD					   July 9, 2006 				      BSD

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