Le 9 févr. 10 à 16:19, udpcast-request@udpcast.linux.lu a écrit :

Date: Tue, 9 Feb 2010 16:19:44 +0100 From: Jens Breuer <breuer.jens@googlemail.com> To: udpcast@udpcast.linux.lu Subject: Re: [Udpcast] does sender need to bind a socket to the multicast addr and receiver (portbase) port ? Message-ID: <76ce20421002090719j1b354fay54a779bdccf9f0cf@mail.gmail.com> Content-Type: text/plain; charset=windows-1252

Hello Rodriguez

You really should try with the most recent version of udpcast to check whether this problem has already been solved over the past 2 years.

Additionally, I would recommend to triple-check the switch' configuration. From my experience in 99 out of 100 cases there is a network misconfiguration when experiencing problems with udpcast.

Just my 0,5?.

Kind regards Jens

Hi Jens, Thanks for your answer; as I wrote, latest version (20100130) does the same. This is why I had to look at the code and make this dirty hack. I'm pretty sure the Dell switch is culprit, but the multicast configuration looks good, and with the modified version of the sender multicast and igmp work as expected. Do you think it is acceptable for the sender to query the multicast data group itself as the general rule or could it bring some more problems ? ( the later case would require my patching of the code with each new release ...). Maybe Alain is the only one who can state here ... thanks Alban -- Alban Rodriguez Centre de Ressources Informatiques Université de La Rochelle http://cri.univ-lr.fr