[e2e] ICMP & TCP segments with IP ID = 0?

[Craig Partridge]

Hi folks:

As a side discovery on a research project, we've tripped over a bunch of
packets in the wild where the IP ID is set to 0.  Some are ICMP packets
and some are TCP segments.

Before we set up a traffic filter to track down what brand of system is
generating these evil beasts, I'm writing to see if anyone has already
figured out what kind of system sends them.

Thanks!

Craig