igmpproxy.conf(5)              File Formats Manual             igmpproxy.conf(5)

       igmpproxy.conf - Configuration file for igmpproxy(8) multicast daemon

       igmpproxy.conf contains the configuration for the igmpproxy multicast
       daemon. It defines which network interfaces should be used by the routing
       daemon. Each interface must be give one of the following roles: upstream
       , downstream or disabled

       The upstream network interface is the outgoing interface which is
       responsible for communicating to available multicast data sources. There
       can only be one upstream interface.

       Downstream network interfaces are the distribution interfaces to the
       destination networks, where multicast clients can join groups and receive
       multicast data. One or more downstream interfaces must be configured.

       On disabled network interfaces all IGMP or multicast traffic is ignored
       altogether. If multiple IP addresses is used on one single interface (ae.
       eth0:1 ...), all interface aliases not in use should be configured as

       Any line in the configuration file starting with # is treated as a
       comment. Keywords and parameters can be distributed over many lines.  The
       configuration file has two main keywords:

              Enables quickleave mode. In this mode the daemon will send a Leave
              IGMP message upstream as soon as it receives a Leave message for
              any downstream interface.  The daemon will then ask for Membership
              reports on the downstream interfaces, and if a report is received
              the group is joined again upstream. Normally this is not noticed
              at all by clients on the downstream networks. If it's vital that
              the daemon should act exactly as a real multicast client on the
              upstream interface, this function should not be used. Disabling
              this function increases the risk of bandwidth saturation.

       phyint interface role [ ratelimit limit ] [ threshold ttl ] [ altnet
       networkaddr ...  ]
              Defines the state and settings of a network interface.

              The name of the interface the settings are for. This option is
              required for phyint settings.

              The role of the interface. This should be either upstream (only
              one interface), downstream (one or more interfaces) or disabled .
              This option is required.

       ratelimit limit
              Defines a ratelimit for the network interface. If ratelimit is set
              to 0 (default), no ratelimit will be applied. This setting is

       threshold ttl
              Defines the TTL threshold for the network interface. Packets with
              a lower TTL than the threshols value will be ignored. This setting
              is optional, and by default the threshold is 1.

       altnet networkaddr ...
              Defines alternate sources for multicasting and IGMP data. The
              network address must be on the following format 'a.b.c.d/n'. By
              default the router will accept data from sources on the same
              network as configured on an interface. If the multicast source
              lies on a remote network, one must define from where traffic
              should be accepted.

              This is especially useful for the upstream interface, since the
              source for multicast traffic is often from a remote location. Any
              number of altnet parameters can be specified.

       whitelist networkaddr
              Defines a whitelist for multicast groups. The network address must
              be in the following format 'a.b.c.d/n'. If you want to allow one
              single group use a network mask of /32, i.e. 'a.b.c.d/32'.

              By default all multicast groups are allowed on any downstream
              interface. If at least one whitelist entry is defined, all igmp
              membership reports for not explicitly whitelisted multicast groups
              will be ignored and therefore not be served by igmpproxy. This is
              especially useful, if your provider does only allow a predefined
              set of multicast groups. These whitelists are only obeyed by
              igmpproxy itself, they won't prevent any other igmp client running
              on the same machine as igmpproxy from requesting 'unallowed'
              multicast groups.

              You may specify as many whitelist entries as needed. Although you
              should keep it as simple as possible, as this list is parsed for
              every membership report and therefore this increases igmp response
              times. Often used or large groups should be defined first, as
              parsing ends as soon as a group matches an entry.

              You may also specify whitelist entries for the upstream interface.
              Only igmp membership reports for explicitly whitelisted multicast
              groups will be sent out on the upstream interface. This is useful
              if you want to use multicast groups only between your downstream
              interfaces, like SSDP from a UPnP server.

       ## Enable quickleave quickleave
       ## Define settings for eth0 (upstream)
       phyint eth0 upstream

       ## Disable alternate IP on eth0 (eth0:0)
       phyint eth0:0 disabled

       ## Define settings for eth1 (downstream)
       phyint eth1 downstream ratelimit 0 threshold 1

       ## Define settings for eth2 (also downstream)
       phyint eth2 downstream


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

igmpproxy 0.3                                                  igmpproxy.conf(5)