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 Packets, make sure that only 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 Packets, make sure that only 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.