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

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IRIP(4) 			   BSD Kernel Interfaces Manual 			  IRIP(4)

NAME
     irip -- Raw IP over ISDN network driver

SYNOPSIS
     pseudo-device irip count

DESCRIPTION
     The irip driver interfaces the IP subsystem of the operating system with the ISDN layer so
     that transport of IP packets over an ISDN link is possible.

     The driver just packs IP packets without anything appended or prepended into raw HDLC pack-
     ets on the B channel and transfers them to a remote site.	IP packets received from the
     remote site are queued into the local IP protocol stack.

     The format of the resulting packet on the B channel is:

	   (HDLC opening flag) (IP-packet) (CRC) (HDLC closing flag)

     In the case where an IP packet for a remote site arrives in the driver and no connection has
     been established yet, the driver communicates with the isdnd(8) daemon to establish a con-
     nection.

     The driver has support for interfacing to the bpf(4) subsystem for using tcpdump(8) with the
     irip interfaces.

     The driver optionally (when compiled with the IRIP_VJ option) provides Van Jacobson header
     compression, under control of the link0 and link1 options to ifconfig(8):

	   link0	    Apply VJ compression to outgoing packets on this interface, and
			    assume that incoming packets require decompression.
	   link1	    Check incoming packets for Van Jacobson compression; if they appear
			    to be compressed, automatically set link0.

     The default values are on for link1 and off for link0.

SEE ALSO
     bpf(4), isdnd.rc(5), isdnd(8), tcpdump(8)

AUTHORS
     The irip device driver and this man page were written by Hellmuth Michaelis <hm@kts.org>.

BSD					   July 6, 1998 				      BSD
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