[atlas] edst 193.0.0.228 in traceroute results

Hello,

In https://atlas.ripe.net/measurements/2928258, I did a UDP
traceroute. "edst":"193.0.0.228" from first hop and second hop somehow
showed up in the results after the last hop that responded to
traceroute, which should have been a reply to buil-in measurement to
tt01.ripe.net. And under maps tab the result is presented with the
first 2 hops showing up after several non-responding hops.

Is this a bug? I actually see it happening quite often in atlas
traceroute results with firmware > 4680. Another example is
https://atlas.ripe.net/measurements/2928262

>>>
https://atlas.ripe.net/docs/bugs/
2015-03-04

Before firmware 4680, traceroute could experience interference from
other measurements. In general, periodic traceroutes did not interfere
with other periodic traceroutes, but could experience interference
from one-off traceroutes. Typically, this interference will show up in
the 'edst' field. This problem was fixed in 4680.

Thanks.


Yang