[SCION] Intermittent ICMP/SCMP message failures

Matthew McCormack mmccorm1 at andrew.cmu.edu
Tue Dec 10 22:14:51 CET 2019


I created an AS (attached to the 19-ffaa:0:1303 (Magdeburg AP) using the
debian packages on a baremetal hosting service (cloudlab.us) where I am
running Ubuntu 16.04 (and using openVPN for the overlay link). When I check
the health of this AS using the webapp, I receive intermittent failures for
ICMP/SCMP.  These results are similarly repeated when I repeat the tests on
the command line (where attempting to ping a border router, e.g.,
I might experience 100 dropped packets, or return an RTT of ~120 mseconds
for each packet). The SCMP messages upon failure return: "ERROR: SCMP
validation" and succeeds after 65 echo attempts. However, this returns to a
failed state after a short time period (~10 seconds of inactivity). Do you
have any insights as to why I am experiencing this intermittent failure?

I'm happy to provide any additional descriptions of the setup that
might help in debugging (e.g., log data, other configurations, etc).

Thank you for your time and consideration.

Very Respectfully,
Matt McCormack

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