[atlas] Paris-traceroute flow identifier

Hello,
This is Ibrahim Ethem Coskun from University of Nevada, Reno. I'm currently
working on an Internet Measurement project with Professor Mehmet Hadi
Gunes. We are modifying paris-traceroute's source code and set the flow
identifier of each packet (both sending and returning packets) to a
constant value for every traces. So that, we want a trace to follow the
same path whenever we traceroute the same target. However, I get the below
warning messages from each probe :
paris-traceroute -T 500 -i -l -M 5 -p icmp -r 44000 -a hopbyhop -n " +
target_ip

[WARN](TracertImpl.cc, 335)ICMP reserved words 0 0 0 0 0
[WARN](TracertImpl.cc, 330)Bad return flow id 0xd24e from 4.69.152.80


So, what does this warning mean, I checked the source code but couldn't
find and information regarding this issue, I also email paris-traceroute
team, but no responses. I googled my question and found a similar question
emailed to to you (
https://www.ripe.net/ripe/mail/archives/ripe-atlas/2012-July/000534.html).
I would be very pleased if you can answer my question.

Thank you;
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