@Clive_A It was a wild ride, but now I was able to successfully put the new ER7206 router into operation with the existing VLAN configuration. I came close to simply configuring the new router again...

@Clive_A I'll be happy to try it out, although removing all ports at once is not allowed. If I remove and save the fourth port LAN (it is the only one used) in the VLAN configuration of the LAN...

Thanks for the prompt feedback Clive_A. I would be glad if that was the cause, because then it would be comprehensible and I could be annoyed about my self-induced misconfiguration ;-) I have...

After countless attempts to replace my ER605v1 router with a more recent model, I am quite amazed at how such a simple undertaking can fail. First the procedure failed with an ER605v2 and then with...