In our 2 machines of test, it seems now WORK the multicast!!! :DDDDDD
Now, when our Computing Laboratory don´t have class(probably on Thursday), we will really use and test if the MULTICAST will now work full correctly! 
Thanks for the help @Tom-Elliott and I believe that this week I will give feedback on how everything happened and worked as expected.
Very excited with this! \o/ 
Just to do a feedback with the tests with WORKING branch, the multicast now show and continues showing after creating him, but for some reason, after the machines starting the imaging progress, the image don´t start freezing in the initial screen of the “partclone”. I see the multicast doesn’t stop after the timout configured, and the machines doens’t start the image. I tested in our LAN network and in our VLAN network and same have ocurred.
Best regard, Igor.
Just for notice,
I’m using Fog 1.5.4 normally with ubuntu 16.04 and this function is working fine. Both this option you mentioned and the option to go in the option “power management” work the same.
Best regards, Igor.
@tom-elliott said in Multicast problem:
This is a known issue with 1.5.4, and some versions earlier. Mind installing the
workingbranch?The only change that’s there waiting for more input is exactly about multicast session, among all multicast tasks, being fixed. I hear it may not be perfect, but I’m unable to replicate the issue. You can’t have two multicast sessions of the same exact name running at the same time. (I think this is where the issue was, somebody started a second task with the same name as an already running task.)
If you need help getting the working branch, please look here: https://wiki.fogproject.org/wiki/index.php?title=Getting_FOG#Getting_FOG
@Tom-Elliott Yes, we are using in our work. But, we are 3 peoples and just me and my supervisor use the program. We use together and start just one task. Should we wait for a new version of Fog to come out, or is there still something to be done?
We are going to install this working bench tomorrow and test this.
Thanks!!
@Sebastian-Roth
Before send the Multicast image task.
And After send the imagem Multicast task gone.
Hello, i have a problem multicasting the image in my network computers, i’´m using the 1.5.4 version. I have tested multicast in 1.5.2 version im my virtual machine(ZenServer) and worked fine in the first time i tested, but now, in this new version with clean install, i have this issue. When i start the image multicast process, the task start, but some seconds later, the taks just magically disappear from the tasks management. Opening the log viewer, i see this:
[06-20-18 4:19:11 pm] * No tasks found!
[06-20-18 4:19:22 pm] | Task (15) test1 is new!
[06-20-18 4:19:22 pm] | Task (15) /images/Laboratorio-2-Teste image file found.
[06-20-18 4:19:22 pm] | Task (15) test1 5 clients found.
[06-20-18 4:19:22 pm] | Task (15) test1 sending on base port: 60540.
[06-20-18 4:19:22 pm] | Command: /usr/local/sbin/udp-sender --interface eth1 --min-receivers 5 --max-wait 720 --mcast-data-address 172.16.0.9 --portbase 60540 --full-duplex --ttl 32 --nokbd --nopointopoint --file /images/Laboratorio-2-Teste/d1p1.img;/usr/local/sbin/udp-sender --interface eth1 --min-receivers 5 --max-wait 10 --mcast-data-address 172.16.0.9 --portbase 60540 --full-duplex --ttl 32 --nokbd --nopointopoint --file /images/Laboratorio-2-Teste/d1p2.img;
[06-20-18 4:19:22 pm] | Task (15) test1 has started!
[06-20-18 4:19:31 pm] | Cleaning 1 task as they have been removed
[06-20-18 4:19:31 pm] | Task (15) test1 is being cleaned.
[06-20-18 4:19:31 pm] | Task (15) test1 has been completed.
[06-20-18 4:19:32 pm] * No tasks found!
[06-20-18 4:19:42 pm] * No tasks found!
What is going on ? I really don’t know why Fog is doing this.
Note: The clients don’t enter in the multicast session, that’s have no time for doing this, because the task start and a few seconds later(less than 10 seconds or 5)the tasks ends.
Can anyone help me with this, i have really sad with this 
Thanks