In pingplotter I set the packets to udp with the defrag button unchecked and the packet length set to over 1400. Pingplotter shows responses from every hop along the way and also from the final ip address.

I thought when you send a udp packet with a length over the mtu of a router then the receiving router just drops the packet and sends nothing back to originating device???

How is it that pingplotter shows responses from all the hops when the mtu is set too high using udp???.

If I use windows command line:
ping -f www.twitter.com -l 1400
with the vpn set to udp, that ping command times out with no response.
With the windows command :
ping -f www.twitter.com -l 1300
amd the vpn set to udp, that ping command completes as normal.

For example, in pingplotter set the protocol to udp, the packet length to 1700 and uncheck the defrag button. I don't believe any router has an mtu over 1500 for normal traffic so the normal response to udp packets that size should be a timeout with no error yet pingplotter shows responses from every hop along the way.

What I'm trying to find out is how to know what/where the timeout is coming from when using udp. Can pingplotter help me do that??
thanks for all the help.