Comment 64 for bug 1719436

One piece of advice is to check the MTU of the network settings. When one sees that the connectivity works but sending any kind of packets through the network starts to fail or stall, it should be an indicator that you need to verify MTU.

MTU can be verified using the ping command. Use the `-M do` option to make sure that the packet is not fragmented and send a packet that will take up the full frame size. Remember to take into account the sizes of the ICMP (8) and IP (20) headers.

Thus to verify the MTU is fully configured everywhere for jumbo frames (say 9000 bytes), you can use:

ping -M do -s 8972 <target address>