Re: [gnet] mcast not receiving

[David Helder <dhelder umich edu>]

If you modify examples/sdr.c to receive from your group, does that work?

I think the ttl is high enough..

David


On Wed, 3 Oct 2001, Shaun Jackman wrote:

> I set up a mcast receive socket, but it doesn't seem to be receiving!
> I'm not sure where to start troubleshooting. The code's not long so I've
> attached the pertinent bit at the end of this e-mail. I ran tcpdump to make
> sure the packet is going out on the wire, and it seems to have made it there
> just fine. I traced it with gdb and it blocks in the call to
> gnet_mcast_socket_receive. Any idea why it's not receiving?
>
> $ tcpdump -ei eth1
> 12:00:47.540261 0:1:2:c3:fd:8a 1:0:5e:7f:ed:ff ip 60: 192.168.0.3.35477 >
> 239.255.237.255.3792:  udp 16 (DF) [ttl 1]
>
> Thanks,
> Shaun
>
> [begin code]
> int
> main( int argc, char* argv[])
> {
> 	// init
> 	GMcastSocket* socket = gnet_mcast_socket_new();
> 	g_assert( socket);
> 	GInetAddr* group = gnet_inetaddr_new( "239.255.237.255", EDNET_PORT);
> 	g_assert( group);
> 	gint status = gnet_mcast_socket_join_group( socket, group);
> 	g_assert( !status);
> 	gint8 buf[ 1024];
> 	GUdpPacket* packet = gnet_udp_packet_receive_new( buf, sizeof( buf));
> 	g_assert( packet);
>
> 	// rx
> 	for(;;) {
> 		gint len = gnet_mcast_socket_receive( socket, packet);
> 		if( len == -1)
> 			continue;
> 		cout << "Received " << len << " bytes." << endl;
> 	}
>
> 	// cleanup
> 	gnet_mcast_socket_leave_group( socket, group);
> 	return 0;
> }
> [end code]
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      __          _    __ David Helder - dhelder umich edu
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