|
liveGate for IntranetsTM
Connect two multicast-enabled networks that are separated by non-multicast-enabled routers
|
"liveGate for Intranets" is a special version of the
liveGateTM
server that can be
used to connect a private, multicast-enabled network
to another multicast-enabled network
(or even to the public
Multicast Internet - aka. "MBone").
It is used in environments where this connectivity cannot be
accomplished using full IP multicast routing - for instance, because an
internal network is connected to the public Internet through a firewall,
or because two distinct internal networks are separated by non-multicast-capable routers.
A typical use of "liveGate for Intranets" (& "liveGate") in a firewalled
environment is as follows:
- A copy of "liveGate" is run on an external machine.
It is configured with a UDP tunnel - through the firewall - to a trusted machine on the
internal network.
- A copy of "liveGate for Intranets" is run on the trusted internal machine.
It is configured with a UDP tunnel - through the firewall - to the external machine.
- The firewall is configured to permit the UDP tunnel to pass between these two machines.
(Note that this requires enabling only a single UDP port - between these two machines only.)
The internal server ("liveGate for Intranets") controls the relaying
of multicast packets across the tunnel.
This server acts as a master
for the tunnel; the external server ("liveGate") acts as a slave.
(For more information about UDP tunneling, including the master-slave relationship,
see the UMTP specification.
For more information about IP multicast and firewalls, see the following
RFC.)
As described further in the
configuration instructions,
"liveGate for Intranets" uses special configuration commands
to start (& stop) the relaying of specific multicast
groups and ports.
It also includes an optional 'remote control' mechanism that allows other, selected,
machines on the internal network to specify any group(s)/port(s) that they
wish to have relayed.
An Example: Extending the 3COM NBX phone system across multiple networks
- Several customers have used "liveGate" and "liveGate for Intranets"
to enable off-premise paging and conferencing for the
3COM NBX 100 phone system.
"LIVE555", "liveGate", "liveGate for Intranets", and the Live Networks logo are trademarks of
Live Networks, Inc.