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 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 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>.