[e2e] Packet reordering in Internet

[Manish Jain]

Hello,

I was wondering if there are measurement studies of Internet traffic
quantifying the magnitude of packet reordering within a TCP flow. Is
reordering a common problem for TCP in the current Internet? How about
the load balancing features in the routers from major vendors : is it
per flow basis or per packet basis, and if flow based load balancing
is done, then how is the flow classification is done these routers?
What could be/are other sources of reordering withing a TCP flow?

Thanks,
Manish