Multicast issue

[balatis]

Hello,

We are working on a project with 4 lines, 4 IP Routers and 1 LM. 
When we configure LM with the following settings*(attached photo), the multicast connection is interrupted and the IP routers are not shown in ETS- KNX Connections. No filters are active.
Why this happens?

Thank you in advance.

[Daniel]

Can you try disabling Pass individual telegrams option and see if it is still happening?

[balatis]

Can you try disabling Pass individual telegrams option and see if it is still happening?

The problem still remains.

[Erwin van der Zwart]

Is the LM only connected to IP or also to a TP line?

[balatis]

Is the LM only connected to IP or also to a TP line?

Only connected to IP.

[Erwin van der Zwart]

Do you have a managed switch?

[balatis]

Do you have a managed switch?

No, the switch is unmanaged.

[admin]

Can you run Wireshark on your PC and provide traffic capture for both cases - when LM is connected or not?
Use this filter: _ws.col.protocol=="KNXnet/IP"
Export using File > Export Specified Packats, make sure that only [b]Displayed" packets are exported.

[balatis]

Can you run Wireshark on your PC and provide traffic capture for both cases - when LM is connected or not?
Use this filter: _ws.col.protocol=="KNXnet/IP"
Export using File > Export Specified Packats, make sure that only [b]Displayed" packets are exported.

OK, thank you for the response.
The project is far away, so we will try it when we are there.

[JMemphix]

Is there a preference between using Multicast and IP addressing? Could asked for both IP Routers, and again for LM5s.

[admin]

Tunneling allows only one-to-one connections while Routing (multicast) allows communication between multiple KNX/IP devices on the same network. If you have more than 2 KNX/IP devices then multicast must be used.

[balatis]

Hello!
The issue we had, has been solved.
The router, by default, didn't allow multicast communication. That was the reason.
Thank you for your time and responses.