[Udpcast] how to by-pass HELLO message mechanism through -m option ?

Alain Knaff alain at knaff.lu
Tue Sep 1 23:40:33 CEST 2009


The hello packets contains other parameters than just the multicast
address (such as blocksize and capabilities). So, the -m option is not
enough to convey all information that is in the HELLO packet

Regards,

Alain

Selçuk Cevher wrote:
> Hi All,
> 
> I want to use udpcast in unicast (or pointopoint) mode.
> 
> However, I do not want udp-sender to determine whether to use unicast or
> multicast based on the number of connections coming from the clients since I
> want to test udp-sender along with another application on the receiving side
> other than udp-receiver (In this framework, there won't be any connections
> coming from the clients).
> 
> Based on above, I want udp-sender to use the unicast destination IP address
> provided by the user from the command line or it may be even hard-coded into
> the source code.
> 
> I tried to use -m option to specify a unicast address instead of a multicast
> address to "trick" udpcast.
> 
> But, it did not like that. I guess that it got some kind of negative
> feedback from the existing udp-receiver clients, and aborted the transfer
> since the clients were expecting a "proper" multicast address after -m
> option.
> 
> Any ideas to overcome this issue ?
> 
> Thanks.
> 
> 
> 
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