Good evening,
I tried the Multicast example in the HowTo's and it works fine in a LAN.
But I try to design an application for a company Inranet with MC over
different subnets (across routers!)
I wrote two console programs (MC source / MC client exactly like in the
HowTo's) to allow the network administrator to configure and to test the
routers from the source subnet to the destination subnet.
Now, as I understand, the only thing the client SW has to do, is to send
IGMP messages to the LAN port (gateway address) of the router in the
destination subnet? The network admin has to make sure that the packet is
forwarded across the intermediate routers (PIM) between source and
destination subnet.
But in the synapse library I have not found any IGMP method for the client.
So, is it that the
rcvsock.AddMulticast('234.5.6.7');
includes already the necessary IGMP protocol, as the documentation says:
Set Time-to-live value for multicasts packets. It define number of routers
for transfer of datas. If you set this to 1 (dafault system value), then
multicasts packet goes only to you local network. If you need transport
multicast packet to worldwide, then increase this value, but be carefull,
lot of routers on internet does not transport multicasts packets!
As I understand, I only need to set the TTL according to the number of
routers in between source and destination, and I don't need to care about
anything else?
In other words: Is it correct, that I only need to set the
sndsock.MulticastTTL property according to the number of routers, and the
network admin has to assure that the intermediate routers forward the
packets, and that is all?
Thank you in advance
Christian Sporer
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