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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 pos‐
     sible.

     The driver just packs IP packets without anything appended or prepended
     into raw HDLC packets 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 connection.

     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 compres‐
			    sion; if they appear to be compressed, automati‐
			    cally 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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