Hi @Threesa 

Thanks for posting in our business forum.

Your network diagram and setup. Next hop should be the accessible destination.

And please explain what you mean by fail. Not allow you to input the value? Or input successfully, but not working effectively.

What is the ISP v6 prefix?

Hi @Threesa 

Thanks for posting in our business forum.

Can you provide a diagram and full description of your front end, the issue and the error you are talking about?

What do you mean by removing the front and accepting it? Who reported incorrect IP? The front end??

Threesa wrote

  @Clive_A 

If I input the entire local IPv6 address of my router (which should be the default Gateway) the frontend doesn't allow it.

If I remove the / the frontend accepts it, but then comes back with the message that it's an incorrect IP address.

 

IPv6 address (local) of the router: 2a02:1811:c511:f400::/64

I am still confused. With some screenshots to illustrate your issue. Please make a clear description.

Hi @Threesa 

Thanks for posting in our business forum.

Threesa wrote

  @Clive_A 

OMG! That did it indeed :o
Could you explain me why, please?

IPv6 prefix 64 represents a subnet with a large number of available host IP addresses, while IPv6 prefix 0 denotes an unused or reserved IPV6 network address range.

Hi @Threesa 

Thanks for posting in our business forum.

Threesa wrote

  @Clive_A 

That much is clear indeed. But why didn't my switch accept it as a value?

Does the 64 prefix imply a limited set of starting digits in the IP address (like the different scopes and subnets in IPv4)? So that the switch didn't accept it, because the IP I tried to enter was out of the range of a 64 prefix network?

Seem to be the case. Yes.