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igmpproxy(8)		     System Manager's Manual		    igmpproxy(8)

NAME
     igmpproxy - Multicast router utilizing IGMP forwarding

SYNOPSIS
     igmpproxy [-h] [-n] [-d] [-v [-v]] config-file

DESCRIPTION
     igmpproxy	is  a simple multicast routing daemon which uses IGMP forwarding
     to dynamically route multicast traffic. Routing is done by defining an "up-
     stream" interface on which the daemon act as a normal Multicast client, and
     one or more "downstream" interfaces that serves clients on the  destination
     networks.	This  is  useful  in  situations  where  other dynamic multicast
     routers (like 'mrouted' or 'pimd') cannot be used.

     Since igmpproxy only uses IGMP signalling, the daemon is  only  suited  for
     situations  where	multicast  traffic comes from only one neighbouring net-
     work.  In more advanced cases, 'mrouted' or 'pimd' is probably more suited.
     The daemon is not designed for cascading, and  probably  won't  scale  very
     well.

     Currently only IGMPv1 and v2 is supported on downstream interfaces.  On the
     upstream  interface the kernel IGMP client implementation is used, and sup-
     ported IGMP versions is therefore limited to that supported by the kernel.

OPTIONS
     -h     Display help.

     -v     Verbose logging. Set logging level to INFO instead of  WARNING  used
	    by default.

     -vv    More verbose logging. Set logging level to DEBUG.

     -n     Do not run as a daemon.

     -d     Output log messages to STDERR instead of to syslog(3).  Implies -n.

LIMITS
     The  current  version  compiles and runs fine with the Linux kernel version
     2.4. The known limits are:

     Multicast routes: more then 200

     Multicast group membership: max. 20

FILES
     /proc/net/ip_mr_cache
	    - contains the active multicast routes

     /proc/net/ip_mr_vif
	    - contains the 'virtual' interfaces used  by  the  active  multicast
	    routing daemon

     /proc/sys/net/ipv4/conf/<ifname>/force_igmp_version
	    -  can  be set to control what IGMP version the kernel should use on
	    the     upstream	  interface.	   Ex.:      'echo	2      >
	    /proc/sys/net/ipv4/conf/eth0/force_igmp_version' will force the ker-
	    nel to use IGMPv2 on eth0 (provided this is the upstream interface).

SEE ALSO
     igmpproxy.conf(5), mrouted, pimd, smcroute

BUGS
     Currently none (but there probably will be :-/ )

AUTHOR
     Originally written by Johnny Egeland <johnny@rlo.org>.

igmpproxy 0.4							    igmpproxy(8)

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