@ITV I also don't think it's just dns that's the problem, so the title is a bit wrong :-.) , but it's not so easy to define the problem sometimes. I don't think you can ping anything on ip either....

@ITV You can try with some vlan / acl. I have not tried this. I had two routers connected to a WAN switch at the time I was doing this. but found that it was not possible.

@ITV My experience with this is that this only applies if the routers are connected to a switch on the WAN side, it happens regardless of whether the router is in control or stand alone, it happens...

@ITV ok then I know what the problem is, I had the same problem 4-5 years ago with the ER605v1. if I connected 2 or more ER605v1 in the same switch on the WAN, the network did not work for one of the...

@ITV I have one more question. are all these routers out at the customer's or all connected on the bench before you deliver.

@AshTheDash It shouldn't be a problem to collect all the cables in a switch, that's what switches are for, but if you need poe then you have to find another switch, TL-SG1016DE does not have poe.