Hello,
Been on a mission to get a more clear understanding of the discovery mechanisms.
I am very confused with the Global Discovery service. I see that it can be used to identify the services across the administrative domain. Does this mean it can find the servers across multiple networks? GDS in Network A, can find all the OPC UA applications in network B,C etc.. provided they are registered to the GDS?
Does it by any chance replace the subnet discovery? I can see that GDS can also incorporated in the single network. I actually do not seem to understand as to how would it be beneficial.
I see that mDNS is not so secure, however GDS in a single network still uses multicast extension faciltiies to register the servers.

I understand there is a certificate management system, which would produce the signed certificates for all the applciations registered to the GDS, so that they can communicate between each other, without having to manually transfer the certficates prior to the communication.

But such a thing is never a concern if we are using a security mode of NONE in a communication scenario right?
I could be wrong here. Please do correct me.

The specification for the GDS part just kicks of too technical, leaving behind a lot of questions.
Could you clarify please.

Regards,
Rakshan