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<H2>Multicast Routing Configuration</H2>
<P>
The Internet community has reserved a set of addresses, called multicast
addresses, that behave differently from normal network addresses. Packets
sent to multicast addresses are recognized only by the systems 
that have subscribed to recognize them. Subscription information is handled
by a multicast routing protocol called Distance-Vector Multicast Routing
Protocol (DVMRP). The multicast daemon maintains a list of all active multicast
sessions and the clients that subscribe to them. It sends the multicast packets 
from the sending system to each client using the shortest path.
</P>
<P>
Some router systems do not handle multicast traffic. To prevent these 
routers from obstructing multicast messages, you can set up a tunnel so
that these routers are bypassed. 
</P>
<P>
Use the Multicast Routing form to set the following parameters:
</P>
<P>
<STRONG>Enable multicast routing:</STRONG> This selection turns multicast
routing on and off for this system. Select <VAR>Yes</VAR> to turn on multicast 
routing and <VAR>No</VAR> to turn it off.
</P>
(Default value: No)
<P>
<STRONG>Enable tunnel:</STRONG> This selection sets up a tunnel from your
networks to a remote network through a router that does not route multicast
traffic. Select <VAR>Yes</VAR> to enable the tunnel and <VAR>No</VAR> to
disable it.
</P>
(Default value: No)
<P>
<STRONG>Interface:</STRONG> This selection specifies the source side of a routing
tunnel. Select the network interface on this system that is connected to the network 
that requires a tunnel. 
</P>
(Default value: none)
<P>
<STRONG>Remote IP address:</STRONG> This selection specifies the destination side
of a routing tunnel. Enter the Internet address of the system on the destination
end of the multicast transmission. Use dotted decimal (such as 1.2.3.4) or 
hexadecimal (such as 0x01020304) notation in your entry.
</P>
(Default value: none)
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