Troubleshooting a multicast

sudo killall udp-sender

udp-sender --file /opt/fog/log/multicast.log --ttl 1

you should see broadcasting control to: and it should be the highest address of the subnet your fogserver is on
the line before that should say your fogserver ipaddress and the interface
Now boot up 1 client go to your pxe menu and select debug mode. Do this on the same subnet if possible. Type in:

udp-receiver --mcast-rdv-address yourfogserver

On your server you should see that 1 client connected and then you can press any key to start the transfer
On your client you should see the contents of your multicast log file scrolling by the screen. You can press ctrl-C to stop it.

Hopefully that worked. Now we need to test 2 clients.

Run the command on your server again but this time change the --ttl 1 to --ttl 32
You will see that this time your broadcast control is 224.0.0.1 this is the multicast address
Boot both clients in debug mode and run the client command on each. Once you see that both clients have connected to the server press any key and see if the log file transfers again to both machines this time. If it does not then chances are something is not setup properly in your router possibly routing tables or multicast settings.

If it does work then good lets try one more step

gunzip -c "/images/anyimagename" | /usr/local/sbin/udp-sender --min-receivers 2 --portbase 9000 --interface yourInterface --half-duplex --ttl 32

udp-receiver --portbase 9000 --mcast-rdv-address fogserverIP | partimage -f3 -b restore /dev/sda stdin

you might need to change /dev/sda to your correct harddrive if it's different use fdisk -l to find out

If the clients start imaging then it seems that all of your multicast settings are correct and the problem may lie within fog configuration if it doesn't work then you need to check your router settings

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