Multicast support

[astronomy]

(2012-05-15 09:24)mcb30 Wrote:  Have you remembered to create a suitable multicast route on your TFTP/SLAM server machine?

I'm curious what you meant by this. I am struggling to learn how to multicast to solve a problem with my test lab. I've added a route for my multicast address and can ping it, and get responses from the other machines on the line when I ping it. I've got atftpd setup and working normally, it even shows an attempt to give out the requested file (typed in ipxe shell: "initrd tftm://192.168.10.1/myfile.rd") in the atftpd logs. When I wireshark I see the multicast options go to the client, then the server sends packet 0 over and over (to 224.1.1.0) and the client seems to request packet 0 over and over (via the ACK to 192.168.10.1 if i'm understanding the process even remotely correctly) then they both time out.

I'm trying to send the same 130mb ISO to 120 computers at once. Using sanboot it downloads in 10 seconds to a single machine, but by 100 machines it's unbearable and is quicker to boot them in groups of 10-20 (which is still quite slow). I'm now considering putting in a timing function in the boot script to only allow 5 to sanboot at once.