Connection and Coonfiguration

[XSPA2474KW]

Hello everyone,

I want to ask something, because I can't understand from the HomeLynk manual.

I have two small buildings A and B. Each of these has a KNX installation with one line. The A building has also A HomeLynk (1.1.254) for visualization. 
Also these 2 buildings are connected through Ethernet (Link). So far perfect.

I want to connect these 2 lines through Ethernet but I don't know how.

I am thinking 2 cases:

1) Adding a second HomeLynk in the B building and both will have individual address 1.1.0 and 1.2.0? 
Which will be the configuration for each (select in KNX connection ------> TP-UART, EIBnet/IP Routing,  EIBnet/IP Tunneling, EIBnet/IP Tunneling (NAT mode)).
Would be able to visualize both buildings?

2) Adding a new IP Router in each line and to leave the HomeLynk (1.1.254)? 
Which will be the configuration for each (select in KNX connection ------> TP-UART, EIBnet/IP Routing,  EIBnet/IP Tunneling, EIBnet/IP Tunneling (NAT mode)).
Would be able to visualize both buildings?

It is possible to explain with details and 1-2 application example each of the TP-UART, EIBnet/IP Routing,  EIBnet/IP Tunneling, EIBnet/IP Tunneling (NAT mode)) do I use?
When do I use each of them?

Also I need in every case to connect remotely to ETS5 through HomeLynk for programming.

Thanks in advance for your help. I really appreciate that.

BR