In order to make your PC or Unix workstation join a multicast group, you
need an application that supports multicast running on the machine. A
good test tool I use at work to generate and receive multicast traffic
on a Unix host is MGEN/DREC. It is a free application developed by the
Naval Research Lab (NRL) I believe. It can be downloaded from the
internet. You can pick what address you want to send to, the packet
size, the transmit rate, and some other parameters using the MGEN
software. The DREC portion is the receiver and you set it to the
address you want to receive traffic from.
Certain protocols, such as OSPF, use multicast in their operation. If a
router is running OSPF, it will automatically join multicast groups so
that it receives data being sent by the protocol on that address. The
router may also register as a source if it has multicast traffic to
send.
Susan Stone wrote:
>
> Hi.. I am very confused about multicast, May I ask questions as below
>
> 1)How to make the Windows PC or unix host join a multicast group let's say
> 224.0.0.9
> 2)How to send a multicast traffic or how to test the mulitcast work?
> 3)I have a WAN router which has joined multicast 224.0.0.2/5/6, may I know
> why it should be a multicast group? for what purppose normally. I know
> 224.0.0.2 is for all routers, 5 is for OSPF, 6 for OSPF designate router.
> But whether it is a default setting or we have to make it join group
>
> FastEthernet0/0 is up, line protocol is up
> Internet address is 50.100.160.2/22
> Broadcast address is 255.255.255.255
> Address determined by non-volatile memory
> MTU is 1500 bytes
> Helper address is not set
> Directed broadcast forwarding is disabled
> Secondary address 50.100.120.2/27
> Secondary address 50.100.122.2/26
> Multicast reserved groups joined: 224.0.0.2 224.0.0.5 224.0.0.6
>
> 4)Normally in what circumstance, we need to use multicast?
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