Comment 24 for bug 1246236

When we start transferring the kernel over, the machine on the other side stops responding:

15:59:23.563014 IP 10.0.0.12.49164 > 10.0.0.1.tftp: 77 RRQ "ubuntu/amd64/generic/trusty/release/boot-kernel" octet tsize 0 blksize 1408
15:59:23.578439 IP 10.0.0.1.59570 > 10.0.0.12.49164: UDP, length 29
15:59:23.578751 IP 10.0.0.12.49164 > 10.0.0.1.59570: UDP, length 4
15:59:23.579230 IP 10.0.0.1.59570 > 10.0.0.12.49164: UDP, length 1404
15:59:23.599678 IP 10.0.0.1.44700 > 10.0.0.12.49162: UDP, length 26
15:59:24.579356 IP 10.0.0.1.59570 > 10.0.0.12.49164: UDP, length 1404
15:59:24.599841 IP 10.0.0.1.44700 > 10.0.0.12.49162: UDP, length 26
15:59:25.580228 IP 10.0.0.1.59570 > 10.0.0.12.49164: UDP, length 1404
15:59:25.600033 IP 10.0.0.1.44700 > 10.0.0.12.49162: UDP, length 26
15:59:26.581397 IP 10.0.0.1.59570 > 10.0.0.12.49164: UDP, length 1404
15:59:26.600222 IP 10.0.0.1.44700 > 10.0.0.12.49162: UDP, length 26
15:59:27.582615 IP 10.0.0.1.59570 > 10.0.0.12.49164: UDP, length 1404
15:59:27.600402 IP 10.0.0.1.44700 > 10.0.0.12.49162: UDP, length 26
15:59:28.583782 IP 10.0.0.1.59570 > 10.0.0.12.49164: UDP, length 1404
15:59:28.600571 IP 10.0.0.1.44700 > 10.0.0.12.49162: UDP, length 26

It won't respond to pings either, and ARP requests at that point fail:

16:02:58.089006 IP 10.0.0.1 > 10.0.0.12: ICMP echo request, id 5945, seq 1, length 64
16:02:59.088958 IP 10.0.0.1 > 10.0.0.12: ICMP echo request, id 5945, seq 2, length 64
16:03:00.088961 IP 10.0.0.1 > 10.0.0.12: ICMP echo request, id 5945, seq 3, length 64
16:03:03.104829 ARP, Request who-has 10.0.0.12 tell 10.0.0.1, length 28
16:03:04.104824 ARP, Request who-has 10.0.0.12 tell 10.0.0.1, length 28
16:03:04.953050 IP 10.0.0.1 > 10.0.0.12: ICMP echo request, id 5952, seq 1, length 64
16:03:05.104832 ARP, Request who-has 10.0.0.12 tell 10.0.0.1, length 28
16:03:05.952926 IP 10.0.0.1 > 10.0.0.12: ICMP echo request, id 5952, seq 2, length 64

(I'm not sure pxelinux responds to pings, but the ARP request should work I assume)