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