Thank you very much for the explanation.
It seems and sounds, that I can't do much about it, right?
I run these routers for years now and I have seen this now the very first time and, of course, I am not an ISP.

I forgot to mention that the router(s) affected with this is a hEX and a CCR1009 both with version 6.41.3 (stable) of router OS.

Hi all, since some days ago (before these days everything was OK) my log is flooded with the following entries (coming from my firewall rules), which I do not really understand: 20:41:00 firewall,info INPUT: New, No DSTNAT: input: in:PPPoE-Out_T-Online out:(unknown 0), src-mac 00:90:1a:a0:bf:0a, pro...

As I wrote above already, there is no Firewall rule: IP filter rules: 0.

After a couple of weeks and upgrading the CRS226 device to the new OS version 6.17 and the board to the firmware 3.17 I repeated the (routing)performance test of this switch: Downstream: 25Mbps (120Mbit/s ISP line speed downstream) Upstream: 12Mbps (my ISP line speed upstream) NAT rules: 1 (only the...

Agreed. Same here. Pls. remove the 'R' from the CRS :-) I've bought a CRS 226-24G-2S+IN to replace two small switches and my old RB493G (which was running absolutely fine and trouble free over the last 4 years) to have only one device left. After configuring the new device I did some performance tes...

Last week I bought a Cloud Router Switch CRS226-24G-2S+ to replace two small Cisco switches (SG-200) and my RB493G (which was running absolutely fine and trouble free over the last 4 years), because we have needed more ports and I thought it is nice to have only one device left. After configuring th...